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691209
User Manual
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JET 691209 User Manual

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Operating Instructions and Parts Manual
Variable Speed Vertical Mill
Model JTM-1055
For serial no. 120xxxx and higher
JET
427 New Sanford Road LaVergne, Tennessee 37086 Part No. M-690055 Ph.: 800-274-6848 Revision B1 06/2014 www.jettools.com Copyright © 2014 JET

1.0 Warranty and Service

90 Days – Parts; Consumable items; Light-Duty Air Tools
1 Year – Motors; Machine Accessories; Heavy-Duty Air Tools; Pro-Duty Air Tools
2 Year – Metalworking Machinery; Electric Hoists, Electric Hoist Accessories
5 Year – Woodworking Machinery
Limited Lifetime – JET Parallel clamps; VOLT Series Electric Hoists; Manual Hoists; Manual Hoist
JET® warrants every product it sells against manufacturers’ defects. If one of our tools needs service or repair, please contact Technical Service by calling 1-800-274-6846, 8AM to 5PM CST, Monday through Fr iday .
Warranty Period The general warranty lasts for the time period specified in the literature included with your product or on the official JET branded website.
• JET products carry a limited warranty which varies in duration based upon the product. (See chart below)
• Accessories carry a limited warranty of one year from the date of receipt.
• Consumable items are defined as expendable parts or accessories expected to become inoperable within a
reasonable amount of use and are covered by a 90 day limited warranty against manufacturer’s defects.
Who is Covered
This warranty covers only the initial purchaser of the product from the date of delivery.
What is Covered
This warranty covers any defects in workmanship or materials subject to the limitations stated below. This warranty does not cover failures due directly or indirectly to misuse, abuse, negligence or accidents, normal wear-and-tear, improper repair, alterations or lack of main tena nc e.
Warranty Limitations
Woodworking products with a Five Year Warranty that are used for commercial or industrial purposes default to a Two Year Warranty. Please contact Technical Service at 1-800-274-6846 for further clarification.
How to Get Technical Support Please contact Technical Service by calling 1-800-274-6846. Please note that you will be asked to provide proof of initial purchase when calling. If a product requires further inspection, the Technical Service representative will
explain and assist with any additional action needed. JET has Authorized Service Centers located throughout the United States. For the name of an Authorized Service Center in your area call 1-800-274-6846 or use the Service Center Locator on the JET website.
More Information
JET is constantly adding new products. For complete, up-to-date product information, check with your local distributor or visit the JET website.
How State Law Applies
This warranty gives you specific legal rights, subject to applicable state law.
Limitations on This Warranty
JET LIMITS ALL IMPLIED WARRANTIES TO THE PERIOD OF THE LIMITED WARRANTY FOR EACH PRODUCT. EXCEPT AS STATED HEREIN, ANY IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXCLUDED. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU.
JET SHALL IN NO EVENT BE LIABLE FOR DEATH, INJURIES TO PERSONS OR PROPERTY, OR FOR INCIDENTAL, CONTINGENT, SPECIAL, OR CONSEQUENTIAL DAMAGES ARISING FROM THE USE OF OUR PRODUCTS. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.
JET sells through distributors only. The specifications listed in JET printed materials and on official JET website are given as general inform atio n and are not bin ding. JET reserves the right to effect at any time, without prior notice, those alterations to parts, fittings, and accessory equipment which they may deem necessary for any reason whatsoever. JET
Product Listing with Warranty Period
®
branded products are not sold in Canada by JP W Industries, In c.
Accessories; Shop Tools; Warehouse & Dock products; Hand Tools
NOTE: JET is a division of JPW Industries, Inc. References in this document to JET also apply to JPW Industries, Inc., or any of its successors in interest to the JET brand.
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2.0 Table of contents

Section Page
1.0 Warranty and Service ..................................................................................................................................... 2
2.0 Table of contents ............................................................................................................................................ 3
3.0 Safety warnings .............................................................................................................................................. 4
4.0 About this manual .......................................................................................................................................... 5
5.0 Specifications ................................................................................................................................................. 6
6.0 JTM-1055 Layout ........................................................................................................................................... 7
7.0 Setup and assembly ....................................................................................................................................... 8
7.1 Shipping container contents ....................................................................................................................... 8
7.2 Unpacking and cleanup .............................................................................................................................. 8
7.3 Site Preparation .......................................................................................................................................... 8
7.4 Lifting the Mill ............................................................................................................................................. 8
7.5 Electrical Connections ................................................................................................................................ 9
7.6 Lubrication .................................................................................................................................................. 9
8.0 Controls .......................................................................................................................................................... 9
9.0 Operating Precautions ................................................................................................................................. 11
10.0 Adjustments ............................................................................................................................................... 11
10.1 Changing Speed Range ......................................................................................................................... 11
10.2 Manual Fine Feed (handwheel) .............................................................................................................. 11
10.3 Manual Rapid Feed (handle) .................................................................................................................. 12
10.4 Micro Adjusting Nuts for Manual Feed ................................................................................................... 12
10.5 Setting Up for Automatic Feed ............................................................................................................... 12
10.6 Micro Adjusting Nuts for Auto Feed ........................................................................................................ 12
10.7 Head Alignment ...................................................................................................................................... 12
10.8 Pivoting the Head ................................................................................................................................... 13
10.9 Pivot the Ram ......................................................................................................................................... 13
10.10 Moving the Ram ................................................................................................................................... 13
10.11 Table Movement ................................................................................................................................... 13
10.12 Feed Trip Adjustment ........................................................................................................................... 14
11.0 Maintenance ............................................................................................................................................... 14
11.1 Knee Gib Adjustment ............................................................................................................................. 14
11.2 Saddle Gib Adjustment ........................................................................................................................... 14
11.3 Table Gib Adjustment ............................................................................................................................. 14
11.4 Ram Wear Plate Adjustment .................................................................................................................. 14
11.5 Removing the Motor ............................................................................................................................... 14
11.6 Timing Belt Replacement ....................................................................................................................... 14
11.7 Drive Belt Replacement .......................................................................................................................... 15
11.8 Brake Shoe Replacement ...................................................................................................................... 15
12.0 Replacement Parts ..................................................................................................................................... 15
12.1.1 Variable Speed Head – Exploded View .............................................................................................. 16
12.1.2 Variable Speed Head – Parts List ....................................................................................................... 17
12.2.1 Head Assembly – Exploded View ....................................................................................................... 20
12.2.2 Head Assembly – Parts List ................................................................................................................ 21
12.3.1 Base Assembly – Exploded View ........................................................................................................ 24
12.3.2 Base Assembly – Parts List ................................................................................................................. 25
12.4.1 Lead Screw Assembly – Exploded View ............................................................................................. 27
12.4.2 Lead Screw Assembly – Parts List ...................................................................................................... 28
12.5.1 One Shot Lubrication System – Diagram ............................................................................................ 29
12.5.2 One Shot Lubrication System – Parts List ........................................................................................... 30
13.0 Electrical Connections ................................................................................................................................ 31
13.1 Forward/Reverse Switch Wiring ............................................................................................................. 31
13.2 Wiring Diagram ....................................................................................................................................... 32
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3.0 Safety warnings

1. Read and understand the entire owner's manual before attempting set-up or operation of this machine.
2. Read and understand the warnings posted on the machine and in this manual. Failure to comply with all of these warnings may cause serious injury.
3. Replace the warning labels if they become obscured or removed.
4. This manual is intended to familiarize you with the technical aspects of this milling machine. It is not, nor was it intended to be, a training manual.
5. This machine is designed and intended for use by properly trained and experienced personnel only. If you are not familiar with the proper safe use of milling machines, do not use this machine until proper training and knowledge has been obtained.
6. Do not use this mill for other than its intended use. If used for other purposes, JET, disclaims any real or implied warranty and holds itself harmless from any injury that may result from that use.
7. Always wear approved safety glasses/face shields while using this machine. Note: Everyday eyeglasses only have impact resistant lenses; they are not safety glasses.
8. Make certain the machine is properly grounded.
9. Before operating the machine, remove tie, rings, watches, other jewelry, and roll up sleeves above the elbows. Remove all loose clothing and confine long hair. Non-slip footwear or anti-skid floor strips are recommended. Do not wear gloves.
10. Wear ear protectors (plugs or muffs) during extended periods of operation.
11. Keep the fl oor around the machine clean and free of scrap material, oil and grease. Provide adequate space surrounding work area and non-glare, overhead lighting.
12. Don’t use this mill in a dangerous environment, or damp or wet locations, or expose it to rain.
13. Keep machine guards in place at all times when the machine is in use. If removed for maintenance purposes, use extreme caution and replace the guards immediately upon completion of maintenance.
14. Make sure the mill is firmly secured before operating.
15. Make sure that workpiec e is securely attached or clamped to the table. Never use your hand to hold the workpiece.
16. Make all machine adjustments or maintenance with the machine unplugged from the power source.
17. Remove adjusting keys and wrenches. Form a habit of checking to see that keys, wrenches, and other adjusting tools are removed from machine before turning it on.
18. Remove loose items and unnecessary workpieces from the area before starting the machine.
19. Don't force a tool or attachment to do a job for which it was not designed. The right tool will do the job better and more safely.
20. Make certain the main switch is in the OFF position before connecting the machine to the power supply.
21. Give your work undivided attention. Looking around, carrying on a conversation, and "horse-play" are careless acts that can result in serious injury.
22. Maintain a balanced stanc e at all times so that you do not fall or lean against moving parts. Do not overreach or use excessive force to perform any machine operation.
23. Keep visitors a safe distance from the work area. Keep children away.
24. Use recommended accessories; improper accessories may be hazardous.
25. Keep hands away from all moving parts (belts, cutters, gears, etc.).
26. Never operate this machine under the influence of alcohol, drugs, or any medication which may impair your judgment.
27. Some coolants used for machining contain chemicals that may be hazardous to your health if not used properly. Read and understand all user information listed on the coolant container and protect yourself accordingly.
28. Turn off machine before cl eaning. Use a brush or compressed air to removed chips and debris – do not use your hands.
29. Do not stand on machine; serious injury could occur if machine tips over.
30. Never leave the machine running unattended. Turn off power and do not leave the machine until it comes to a complete stop.
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31. Some dust created by power sandi ng, sawing, grinding, drilling and other construction activities contains chemicals known to cause cancer, birth defects or other reproductive harm. Some examples of these chemicals are:
• Lead from lead based paint
• crystalline silica from bricks and cement
and other masonry products, and
• arsenic and chromium from chemically-
treated lumber.
Familiarize yourself with the following safety notices used in this manual:
This means that if precautions are not heeded, it may result in minor injury and/or possible
machine damage.
This means that if precautions are not heeded, it may result in serious injury or possibly even
death.
Your risk from those exposures varies, depending on how often you do this type of work. To reduce your exposure to these chemicals: work in a well ventilated area, and work with approved safety equipment, such as those dust masks that are specifically designed to filter out microscopic particles
32. Failure to comply with all of these warnings may cause serious injury.

4.0 About this manual

This manual is provided by JET covering the safe operation and maintenance procedures for a JET Model JTM-1055 Mill. This manual contains instructions on installation, safety precautions, general operating procedures, maintenance instructions and parts breakdown. Your machine has been designed and constructed to provide years of trouble-free operation if used in accordance with the instructions as set forth in this document.
If there are questions or comments, please contact your local supplier or JET. JET can also be reached at our web site: www.jettools.com.
Retain this manual for future reference. If the machine transfers ownership, the manual should accompany it.
Read and understand the entire contents of this manual before attempting assembly
or operation! Failure to comply may cause serious injury!
5

5.0 Specifications

Model Number ................................................................................................................................. JTM-1055
Stock Number ..................................................................................................................................... 690055
Number of Spindle Speeds ................................................................................................................ Variable
Downfeeds per Revolution of Spindle ........................................................................ 0.0015", 0.003", 0.006"
Spindle Travel .............................................................................................................................................. 5"
Head Movement ........................................................................................................................... 90° L and R
Turret Rotation ......................................................................................................................................... 360°
Size and Spacing of T-Slots ........................................................................................................ 5/8" x 2-1/2"
Overarm Travel .................................................................................................................................... 16-1/2”
Overall Dimensions ....................................................................................................... 108"W x 80"D x 92"H
Net Weight (approx.) ...................................................................................................................... 3,300 Lbs.
The specifications in this manual were current at time of publication, but because of our policy of continuous improvement, JET, reserves the right to change specifications at any time and without prior notice, without incurring obligations.
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6.0 JTM-1055 La yout

7

7.0 Setup and assembly

7.1 Shipping container contents

1 Mill 1 Flat Way Cover (rear) 1 Accordion Way Cover (front) 1 Elevating Crank 1 Quill Handle 1 Drawbar 1 Pin & Nut
1 ToolBox: found in base through rear cover 1 Hex Wrench Set 1 Wrench Set 1 #2 Cross Point Screw Driver 1 #2 Flat Blade Screw Driver 1 Plastic Oil Can 1 Owner’s Manual 1 Warranty Card 1 Eye Bolt
3 Handles 4 Leveling Bolts 4 Leveling Pads

7.2 Unpacking and cleanup

the head to raise into position. Do not remove the nuts; just break the nuts loose.
3. Turn the hex head of the worm shaft (B, Fig. 2) using a 19mm socket and breaker bar. Raise the head aligning the zero marks on the scales. With the help of another person support the head while it is raising.
4. Tighten the four bolts (A, Fig. 1).
5. Loosen the two ram locking handles (C, Fig. 1) and move the ram forward by turning the hex head of the ram pinion (D, Fig. 1) with a 19mm socket and breaker bar.
6. Tighten the ram locking handles before lifting.
33. Finish removing the crate. Leave the mill bolted to the pallet until it is ready to be moved to its final location.
34. Remove the toolbox from the base. It is accessed by removing four screws that hold the rear cover in place.
35. Clean all rust protected surfaces with kerosene, or a light solvent. Do not use gasoline, paint thinner, or lacquer thinner. These will damage painted surfaces.
36. Cover all machined surfaces with a film of light machine tool oil to inhibit rust.

7.3 Site Preparation

Mill must be supported equally under all four corners. Failure to comply may cause the column to tw ist and put a bind in the bedways.
The mill must be placed on an even surface, bolted to the floor, or placed on the leveling pads. Choose a location for the mill that is dry, has good lighting, and has enough room to be able to service the mill on all four sides. Review the JTM-1055 Layout in section 6.0.

7.4 Lifting the Mill

1. Remove the four nuts that hold the unit to the
pallet.
2. Raise the head by loosening four nuts, (A, Fig.
1) with a 22mm wrench, just enough to allow
Figure 1
The preferred method for lifting the mill is with a hook through the eye bolt in the ram (E, Fig. 1). Make sure the chain and hook are properly rated for the weight of the mill. Make sure the chain is not twisted and lift slowly. Make sure the mill is balanced before moving.
Carefully move the mill over the site. Lower the mill over the anchor bolts, or leveling pads. The leveling pads included in the toolbox and the leveling screws will help you to reach a level position. Check the mill for level with a machinist's level placed on the table. Mill must be level back to front and side to side. Shim if necessary when bolting to the floor, but remember that the mill must be supported equally at all four corners. Check for level before tightening the anchor bolt nuts and after tightening them. Adjust as necessary.
8

7.5 Electrical Connections

All electrical connections must be made by a qualified electrician. Failure to comply may cause serious or fatal injury.
The JTM-1055 mill is rated at 230/460V, 3Ph and comes from the factory prewired at 230V.
Confirm power at the site matches power requirements of the mill before connecting to the power source. The power source should be dedicated to the JTM-1055 mill. The main power switch is located on the right side of the machine. Remove the cover, and run the main power cable through the box and attach the ground, followed by power leads. Replace the cover.
Check for proper spindle rotation in the high speed range. The spindle should rotate clockwise when viewed from the top of the machine. If the spindle rotates counter-clockwise, disconnect from the power source, and switch two of the power leads.
To change from 230V to 460V operation, remove the junction box cover on the motor, and change the wires according to the diagram found on the inside of the cover. Also see the wiring diagram at the back of this manual.
The mill must be properly grounded.
Figure 2

7.6 Lubrication

Do not operate t he mill before lubricating the machine fully. Failure to comply may cause damage to the machine.
1. Spindle Bearings & Quill (A, Fig. 2)- fill oil cups
once daily with Mobil DTE® Oil Light.
2. Oil Pump (B, Fig. 2)- fill reservoir as needed by
removing cap on top of tank and filling with Mobil DTE® Oil Light. Pump oil with release handle daily. Way surfaces and leadscrews are lubricated in this manner.
3. Grease Fitting for Spindle Gear (not shown):
located on the backside of the head’s lower housing. Lubricate every month using Mobilith AW2.

8.0 Controls

A. Variable Speed Control (A, Fig. 3) -
located on the right side of the head assembly. Turn clockwise or counter­clockwise to adjust spindle speed.
spindle is turning.
Change speed only when
Figure 3
B. Variable Speed Dial Indicator (B, Fig. 3) -
located on the front of the head assembly. Indicates selected speed in high or low range.
C. Spindle Brake (C, Fig. 3) - located on left
side of the head. Move in either direct ion to stop spindle once power has been turned off.
9
Figure 4
D. High-Neutral-Low Lever (D, Fig. 4) -
located on the rig ht side of the head. The photo shows the lever in the low speed range. Push the lever in and rotate 90° clockwise for neutral. Rotate the lever another 90° for the high speed range.
G. Quill Lock (G, Fig. 4) - located on the right
side of the head. Rotate the handle clockwise to lock the quill in a desired position. Rotate the handle counter­clockwise to release.
H. Micro Adjusting Nut (H, Fig. 4), - located
on the front of the head. Use for setting specific spindle depth . Note: One complete rotation of the micro nut equals 0.05”.
CAUTION: Do not shift High-Low Gear
while motor is running. Rotate the spindle by hand to facilitate changing lever positions.
E. Power Feed Transmission Engagement
Knob (E, Fig. 4) - located on right side of head. When pointer indicates towards the rear of the machine, power f eed worm gear is engaged. To d isengage po wer feed, tur n so pointer indicates towards the fr ont of the machine.
CAUTION: Power feed may be engaged
when spindle is rotating, ho wever , it m ust be engaged gently to avoid damage to the worm gear.
• Do not use power feed at s peeds above 2700 R.P.M.
• It is recommended that the power feed worm gear be disengaged whenever t he power feed is not required. This avoids unnecessary wear on the worm gear.
• Maximum loading is a 3/8” (9.5mm) diameter bit for drilling in steel. Use manual feed for bits larger than 3/8".
F. Quill Feed Handle (F, Fig. 4) - located on
right side of head. Rotate clockwise to lower spindle.
Figure 5
I. Feed Control Lever (I, Fig. 5) - located on
the left side of the head. E ngages overlo ad clutch on pinion shaft when the lever is positioned to the left. Stays engaged until quill stop comes in contact with micro adjusting nut (forcing feed control lever to drop out automatically), or until lever is released manually by positioning lever to the right.
J. Manual Feed (J, Fig. 5) - located on the lef t
front of the head. Fee d reversing knob (K, Fig. 5) must be in the n eutral position. The feed control lever (I, Fig. 5) must be engaged. Note: manual feed handle and handwheel may be taken off when not in use.
K. Feed Reversing Knob (K, Fig. 5) - located
in center of manual feed handwheel. Position of the knob depends upon the direction of spindle rotation. If boring with right hand cutting tools, pull feed knob towards operator until clutch becomes engaged. Neutral position is between forward and reverse position.
10
CAUTION: It is recommended that the knob
be left in the neutral position when not in use.
L. Quill Stop (L, Fig. 6) - located on the front
of head. Used to disengage the autom atic feed in either direction as well as the s etting point for working to a given depth.
M. Quill Feed Speed Selector (M, Fig. 6) -
located on the left side of the head. Turn the knob and indicate pointer towards one of three feed speeds (0.0015”, 0.003”, and
0.006”) per spindle revo lut i on. F ee d is more readily engaged when spindle is turning.
• It is recommended that the power feed worm
gear be disengaged whenever the power feed is not required. This will avoid unnecessary wear on the worm gear.
• Maximum loading is a 3/8” (9.5mm) diameter
bit for drilling in steel. Use manual feed for bits larger than 3/8".
• Overload clutch is factory set to hold up to 200
lbs. down feed pressure on the quill (accommodates drills up to 3/8"). Do not attempt to adjust clutch pressure.
• Only change spindle speeds while the motor is
running.
N. Reversing Switch (N, Fig. 6) - located on
the left side of the head. S witches rotation of spindle.
O. Drawbar (O, Fig. 6) - located on the top of
the head. Used to s ecure the tool h older in the taper. Use the spindle brake while tightening the drawbar

10.0 Adjustments

10.1 Changing Speed Range

To change from high to low speed range, move lever (A, Fig. 7) by pressing in and rotating almost
180. Do not change gears while the spindle is running.
CAUTION: It is recommended to rotate the spindle by hand to ensure the clutch is engaged prior to tur ning o n. Do n ot t urn o n the machine unless the spindle can be moved freely.
Figure 6

9.0 Operating Precautions

• Do not attempt to change spindle RPM while
motor is stopped.
• Be certain the spindle brake is released before
starting the motor.
• Rotate the spindle by hand to facilitate
meshing of the clutch and gears.
• Do not use the quill power feed at speeds
above 2700 RPM.
Figure 7

10.2 Manual Fine Feed (handwheel)

1. Disengage automatic feed by turning knob (B, Fig. 7) so that the pointer indicates towards the front of the machine.
2. Locate the feed reversing knob (C, Fig. 7) in the center or neutral position.
3. Engage feed trip lever (D, Fig. 7) by pulling away from the head assembly.
11
4. The quill can now be moved up or down by
turning the hand wheel.

10.3 Manual Rapid Feed (handle)

1. Disengage automatic feed by turning knob (B, Fig. 7) so that the pointer indicates towards the front of the machine.
2. Locate the feed reversing knob (C, Fig. 7) in the center or neutral position.
3. Disengage feed trip lever (D, Fig. 7) by pushing towards head assembly.
4. Engage the manual quill handle (E, Fig. 7) and push, or pull to raise, or lower the quill.
10.4 Micro Adjusting Nuts for Manual
Feed
1. Lower the quill to the required depth.
2. Tighten the quill lock (A, Fig. 8).
3. Screw the micro nut (B, Fig. 8) against the quill stop (C, Fig. 8), and tighten the micro jam nut (D, Fig. 8).
4. Loosen the quill lock.
5. Use rapid, or fine manual downfeed. Note: Always make a test cut to verify that the
depth of cut is correct.
5. Select feed rate from feed selector knob (F, Fig. 8) 0.0015”, 0.003”, and 0.006” per spindle revolution. It is easier to change feed rate while the spindle is turning.
6. Engage feed trip lever (H, Fig. 8) by pulling away from head assembly.
CAUTION: Power feed may be engaged when spindle is rotating, however, it must be engaged gently to avoid damage to the worm gear.
• Do not use power feed at s peeds above
2700 R.P.M.
• It is recommended that the power feed
worm gear be disengaged whenever the power feed is not required.
• Maximum loading is a 3/8” (9.5mm)
diameter bit for drilling in steel. Use manual feed for bits larger than 3/8".
10.6 Micro Adjusting Nuts for Auto
Feed
1. Lower the quill to the required depth.
2. Tighten the quill lock (A, Fig. 8).
3. Screw the micro nut (B, Fig. 8) against the quill stop (C, Fig. 8), and tighten the micro jam nut (D, Fig. 8).
4. Loosen the quill lock, and engage the power feed knob (E, Fig. 8).
5. Choose the downfeed rate (F, Fig. 8).
6. Engage the feed reversing knob (G, Fig. 8).
7. Engage the feed trip lever (H, Fig. 8). Note: Always make a test cut to verify that the
depth of cut is correct.
Figure 8

10.5 Setting Up for Automatic Feed

1. Ensure quill lock (A, Fig. 8) is off by rotating counter-clockwise.
2. Set micrometer dial (B/D, Fig. 8) to desired depth.
3. Engage auto quill feed knob (E, Fig. 8) by turning so pointer indicates towards the rear of the machine.
4. Select feed direction by pulling or pushing the knob (G, Fig. 8) for up/down feed, neutral is in the middle.

10.7 Head Alignment

The quill housing, and ram were pinned at the factory. The pin has been removed for shipping. The pin can be found in the toolbox.
1. Loosen four nuts (A, Fig. 9) with a 22mm wrench, just enough to allow the head to pivot into position. Do not remove the nuts; just break the nuts loose.
2. Back off the nut so it is flush with the end of the pin. This will allow you to tighten the nut and remove the pin if needed.
3. Gently tap the pin into the hole while slightly rocking the hex head of the worm shaft (C, Fig.
9) back and forth.
The scales on the mill are guides only. Close tolerance work will require the use of a dial indicator to make sure the head is 90° to the table in the X and Y axis. Please note the table is fitted
12
to be slightly higher in the front, usually about .0005".
Figure 9

10.8 Pivoting the Head

1. Remove the pin (B, Fig. 9) by tightening the nut.
2. Loosen four nuts, (A, Fig. 9) with a 22mm wrench, just enough to allow the head to move into position. Do not remove the nuts; just break the nuts loose.
3. Turn the hex head of the worm shaft (C, Fig. 9) using a 19mm socket and breaker bar. Pivot the head aligning the scale marks to the desired angle.
4. Tighten the four bolts (A, Fig. 9). Note: Always make a test cut to verify that the
angle of cut is correct.

10.9 Pivot the Ram

1. Loosen four bolts, (A, Fig. 10) with a 21mm wrench.
2. Remove the pin (B, Fig. 10) by tightening the nut.
3. Pivot the head and ram assembly to the required angle and tighten four bolts.

10.10 Moving the Ram

1. Loosen two ram locking handles (A, Fig. 11).
2. Move the ram by turning the hex head of the ram pinion (B, Fig. 11) with a 19mm socket and breaker bar.
Figure 11

10.11 Table Movement

A. Longitudinal Movement (A, Fig. 12) - handles
located on opposite ends of the table; controls the X-axis.
B. Stops (B, Fig. 12) - located on the front of the
table; controls how far the table travels in either direction.
C. Table Locks (C, Fig. 12) - loc ated on the front
of the saddle used for locking the table in position.
D. Cross Feed M ovement (D, Fig. 12) - located
on the front of the knee; controls the Y-axis.
E. Knee Handle (E, Fig. 12) - located on the
corner of the knee; controls the Z-axis.
Figure 10
Figure 12
13

10.12 Feed Trip Adjustment

11.3 Table Gib Adjustment

1. Loosen lock nut (A, Fig. 13).
2. Engage trip handle (C, Fig. 13) by pulling away from head assembly.
3. Adjust micro nuts (E, Fig. 13) against quill stop (B, Fig. 13).
4. Slowly turn adjus ting screw (D, Fig. 13) unt il lever (C, Fig. 13) trips.
5. Tighten lock nut (A, Fig. 13)
Figure 13

11.0 Maintenance

Adjust one gib located between the table and the saddle. Use a dial indicator to measure the amount of movement in the table. Adjust the gib until the indicator reading is within 0.003”.

11.4 Ram Wear Plate Adjustment

Adjust one wear plate located between the ram and the turret. Use a dial indicator to measure the amount of movement in the ram. Adjust the wear plate until the indicator reading is within 0.003”.

11.5 Removing the Motor

1. Adjust the head to the lowest speed.
2. Disconnect the machine from the power source.
3. Remove three screws (A, Fig. 14) and plate (B, Fig. 14).
4. Use two screws (A-1, Fig. 14) to compress the spring (C, Fig. 14).
5. Rotate the high-neutral-low lever to the high speed range.
6. Remove the reversing switch from the belt housing.
7. Remove two locking nuts (D, Fig. 14).
8. Lift and tilt the motor so that it rests on stud (E, Fig. 14).
9. Ease the belt over the lower drive disc and remove the motor.
Always disconnect the machine from the power source before doing any maintenance. If you do not have the knowledge or training to complete the maintenance, have an authorized JET service center maintain your mill. Failure to comply may cause serious bodily injury.

11.1 Knee Gib Adjustment

Note: When adjusting the gibs for the knee, the
saddle, and the table always start with the knee first, the saddle second, and adjust the table last.
Adjust three gibs located between the knee and the base. Use a dial indicator to measure the amount of movement in the knee. Adjust the gib until the indicator reading is within 0.003”.

11.2 Saddle Gib Adjustment

Adjust two gibs located between the saddle and the knee. Use a dial indicator to measure the amount of movement in the saddle. Adjust the gib until the indicator reading is within 0.003”.
Figure 14

11.6 Timing Belt Replacement

1. Disconnect the machine from the power source.
2. Remove the motor.
3. Lower the quill to the full extent.
4. Remove the two lower screws from the variable speed housing (A, Fig. 15).
5. Remove the six screws (B, Fig. 15).
14
6. Remove the top assembly (C, Fig. 15) and tap to clear dowels.
7. Replace the belt.
Figure 15

11.7 Drive Belt Replacement

1. Disconnect the machine from the power source.
2. Remove the motor.
3. Remove the three screws (A, Fig. 16). Thread the screws into the adjacent tapped holes and back off the cover (B, Fig. 16).
4. Remove the two screws and bushings (C, Fig.
16) from the tilting plate.
5. Remove four screws (D, Fig. 16) and one screw (E, Fig. 16).
6. Remove four screws from the variable speed housing (F, Fig. 16).
7. Remove the top housing (G, Fig. 16) and tap to clear dowels.
8. Replace the belt.
Figure 16

11.8 Brake Shoe Replacement

1. Disconnect the machine from the power source.
4. Remove the top section.
5. Remove the two screws (A, Fig. 17).
6. Remove the clutch hub assembly (B & D, Fig.17).
7. Replace the brake shoes (C, Fig. 17).
Figure 17

12.0 Replacement Parts

Replacement parts are listed on the following pages. To order parts or reach our service depart ment, call 1­800-274-6848 Monday through Friday (see our website for business hours, www.jettools.com). Having the Model Number and Serial Number of your machine available when you call will allow us to serve you quickly and accurately.
15

12.1.1 Variable Speed Head – Exploded View

16

12.1.2 Variable Speed Head – Parts List

1-1 ............ TS-0209051 ............. Hex Socket Cap Screw ........................................ 3/8”x1” ......................... 3
1-2 ............ JTM1055-V01-2 ....... Key ....................................................................... 6x7x30 ........................ 1
3-1 ............ JTM1055-V03-1 ....... Se t Sc r e w ............................................................. .................................... 1
4 ............... JTM1055-V04 .......... Belt ....................................................................... 900VC3830 ................. 1
6 ............... JTM1055-V06 .......... Shaft ..................................................................... .................................... 1
6-1 ............ JTM1055-V06-1 ....... Key ....................................................................... 7x6x30 ........................ 1
6-2 ............ JTM1055-V06-2 ....... Key ....................................................................... 7x7x55 ........................ 1
6-3 ............ JTM1055-V06-3 ....... Flat Washer .......................................................... M8 ............................... 1
8 ............... JTM1055-V08 .......... Bushing ................................................................ .................................... 1
11-1 .......... TS-10503051 ........... Hex Socket Cap Screw ........................................ M6x20 ......................... 3
13 ............. JTM1055-V13 .......... Regulating Screw ................................................. .................................... 1
13-2 .......... JTM1055-V13-2 ....... Hex Nut ................................................................ .................................... 1
14 ............. JTM1055-V14 .......... Bushing ................................................................ .................................... 2
18 ............. JTM1055-V18 .......... Drive Pulley .......................................................... .................................... 1
19 ............. JTM1055-V19 .......... Steady Pulley ....................................................... .................................... 1
20 ............. JTM1055-V20 .......... C-Clip ................................................................... S50 .............................. 1
21 ............. JTM1055-V21 .......... C-Clip ................................................................... R95 ............................. 1
22 ............. JTM1055-V22 .......... Bushing ................................................................ .................................... 1
22-1 .......... TS-1052021 ............. Hex Socket Cap Screw ........................................ M5x6 ........................... 1
23-2 .......... JTM1055-V23-2 ....... Set Screw ............................................................. M6x6 ........................... 1
27-1 .......... JTM1055-V27-1 ....... Brake Spring (short) ............................................. .................................... 1
29-2 .......... JTM1055-V29-2 ....... Hex Nut ................................................................ M6 ............................... 1
30 ............. JTM1055-V30A ........ Brake Assembly (Includes: #27, 27-1, 22, 22-1).. 1
33 ............. JTM1055-V33 .......... Adjustment Stud ................................................... .................................... 1
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35 ............. JTM1055-V35 .......... Adjustment Stud ................................................... .................................... 1
38 ............. JTM1055-V38 .......... Dial Control Shaft ................................................. .................................... 1
39 ............. JTM1055-V39 .......... Bushing ................................................................ .................................... 2
40-1 .......... TS-1502081 ............. Hex Socket Cap Screw ........................................ M5x35 ......................... 3
41 ............. JTM1055-V41 .......... Bushing ................................................................ .................................... 1
45 ............. JTM1055-V45 .......... Shaft ..................................................................... .................................... 1
45-2 .......... JTM1055-V45-2 ....... Nut ........................................................................ .................................... 1
47 ............. JTM1055-V47 .......... Belt ....................................................................... 8M560 ......................... 1
48-1 .......... TS-1502051 ............. Hex Socket Cap Screw ........................................ M5x20 ......................... 1
49 ............. JTM1055-V49 .......... Ball Bearing .......................................................... 6203-2RS .................... 2
50-1 .......... JTM1055-V50-1 ....... Set Screw ............................................................. M8x6 ........................... 1
51-1 .......... JTM1055-V51-1 ....... Key ....................................................................... 5x5x15 ........................ 1
51-2 .......... JTM1055-V51-2 ....... Key ....................................................................... 5x5x18 ........................ 1
52 ............. JTM1055-V52 .......... Nut ........................................................................ 5/8” .............................. 1
57 ............. JTM1055-V57 .......... Ball Bearing .......................................................... 6910ZZ........................ 2
62-1 .......... JTM1055-V62-1 ....... Key ....................................................................... 8x7x12 ........................ 1
63-1 .......... JTM1055-V63-1 ....... Key ....................................................................... 8x7x60 ........................ 1
63-2 .......... JTM1055-V63-2 ....... Key ....................................................................... 8x8x20 ........................ 1
66 ............. JTM1055-V66 .......... Pinion Crank......................................................... .................................... 1
66-1 .......... JTM1055-V66-1 ....... Spri ng Pi n ............................................................. .................................... 1
71 ............. JTM1055-V71 .......... Lock Nut ............................................................... .................................... 1
72 ............. JTM1055-V72 .......... C-Clip ................................................................... S8 ................................ 1
73 ............. JTM1055-V73 .......... C-Clip ................................................................... S25 .............................. 1
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74 ............. JTM1055-V74 .......... C-Clip ................................................................... R72 ............................. 1
75 ............. JTM1055-V75 .......... C-Clip ................................................................... S12 .............................. 1
78 ............. JTM1055-V78 .......... Face Plate ............................................................ .................................... 1
79 ............. JTM1055-V79 .......... Dial Plate .............................................................. .................................... 1
80 ............. JTM1055-V80 .......... Screw ................................................................... 1/8”x1/4” ...................... 4
82 ............. JTM1055-V82 .......... Screw ................................................................... 1/8”x1” ......................... 4
83 ............. JTM1055-V83 .......... Fan Assembly ...................................................... .................................... 1
84 ............. JTM1055-V84 .......... Flat Washer .......................................................... 1/8” .............................. 1
19

12.2.1 Head Assembly – Exploded View

20

12.2.2 Head Assembly – Parts List

1 ............... JTM1055-H01 .......... Hex Socket Cap Screw ........................................ M5X12......................... 1
5 ............... JTM1055-H05 .......... Bushing ................................................................ .................................... 1
7 ............... JTM1055-H07 .......... Key ....................................................................... 3X3X20 ....................... 1
9 ............... JTM1055-H09 .......... Shaft ..................................................................... .................................... 1
17 ............. JTM1055-H17 .......... Knob ..................................................................... .................................... 1
17-2 .......... JTM1055-H17-2 ....... Spring ................................................................... .................................... 1
18 ............. JTM1055-H18 .......... Gear Shaft ............................................................ .................................... 1
18-1 .......... JTM1055-H18-1 ....... Key ....................................................................... 5x5x8 .......................... 1
19 ............. JTM1055-H19 .......... Key ....................................................................... 5x5x12 ........................ 1
20 ............. JTM1055-H20 .......... Needle Bearing .................................................... BA78Z ......................... 1
21 ............. JTM1055-H21 .......... Bushing ................................................................ .................................... 1
23 ............. JTM1055-H23 .......... Shaft (w/bevel gear) ............................................. .................................... 1
27 ............. JTM1055-H27 .......... Bushing ................................................................ .................................... 1
28-1 .......... JTM1055-H28-1 ....... Spring Pin............................................................. .................................... 1
29 ............. JTM1055-H29 .......... Bushing ................................................................ .................................... 1
31 ............. JTM1055-H31 .......... Bushing ................................................................ .................................... 2
33-1 .......... JTM1055-H33-1 ....... Spring Pin............................................................. .................................... 1
35 ............. JTM1055-H35 .......... Cluster Gear Cover .............................................. .................................... 1
36 ............. JTM1055-H36 .......... Shaft ..................................................................... .................................... 1
38 ............. JTM1055-H38 .......... Feed Gear Shift Fork ........................................... .................................... 1
39 ............. JTM1055-H39 .......... Knob ..................................................................... .................................... 1
40 ............. JTM1055-H40 .......... Set Screw ............................................................. M6x6 ........................... 1
40-2 .......... JTM1055-H40-2 ....... Spring ................................................................... .................................... 1
41 ............. JTM1055-H41 .......... Feed Worm Shaft ................................................. .................................... 1
42 ............. JTM1055-H42 .......... Reverse Clutch Rod ............................................. .................................... 1
21
44-1 .......... JTM1055-H44-1 ....... Round Head Screw .............................................. .................................... 3
50 ............. JTM1055-H50 .......... Brass Bushing ...................................................... .................................... 1
51 ............. JTM1055-H51 .......... Set Screw ............................................................. .................................... 1
52-1 .......... JTM1055-H52-1 ....... Spring Pin............................................................. .................................... 1
54 ............. JTM1055-H54 .......... Clutch Washer ..................................................... .................................... 1
59 ............. JTM1055-H59 .......... Angular Bearing ................................................... 7010 ............................ 2
63 ............. JTM1055-H63 .......... Set Screw ............................................................. M6x6 ........................... 2
64 ............. JTM1055-H64 .......... Lock Nut ............................................................... .................................... 1
65 ............. JTM1055-H65 .......... Ball Bearing .......................................................... 6008ZZ........................ 1
65-1 .......... JTM1055-H65-1 ....... Cross Head Screw ............................................... .................................... 2
70 ............. JTM1055-H70 .......... Cam Rod .............................................................. .................................... 1
73 ............. JTM1055-H73 .......... Set Screw ............................................................. M8x6 ........................... 1
73-1 .......... JTM1055-H73-1 ....... Spring ................................................................... .................................... 1
73-2 .......... JTM1055-H73-2 ....... Ball ....................................................................... .................................... 1
75 ............. JTM1055-H75 .......... Reverse Knob ...................................................... .................................... 1
80 ............. JTM1055-H80 .......... Bushing ................................................................ .................................... 1
83 ............. JTM1055-H83 .......... Cam Rod Sleeve .................................................. .................................... 1
83-2 .......... JTM1055-H83-2 ....... Hex Nut ................................................................ .................................... 1
83-3 .......... JTM1055-H83-3 ....... Spring Pin............................................................. .................................... 1
85-1 .......... JTM1055-H85-1 ....... Spring ................................................................... .................................... 1
22
89 ............. JTM1055-H89 .......... Quill Micro-Stop Nut ............................................. .................................... 1
90 ............. JTM1055-H90 .......... Quill Micro-Jam Nut ............................................. .................................... 1
91 ............. JTM1055-H91 .......... Quill Micro-Screw ................................................. .................................... 1
91-1 .......... JTM1055-H91-1 ....... C-Clip ................................................................... .................................... 1
94 ............. JTM1055-H94 .......... Hub ....................................................................... .................................... 1
94-1 .......... JTM1055-H94-1 ....... Set Screw ............................................................. 5/16”x3/8” .................... 1
94-2 .......... JTM1055-H94-2 ....... Spring ................................................................... .................................... 1
98-2 .......... JTM1055-H98-2 ....... T-Pin ..................................................................... .................................... 1
100 ........... JTM1055-H100 ........ Set Screw ............................................................. .................................... 1
101 ........... JTM1055-H101 ........ Plunger ................................................................. .................................... 1
102 ........... JTM1055-H102 ........ Lever .................................................................... .................................... 1
103 ........... JTM1055-H103 ........ Set Screw ............................................................. .................................... 1
105 ........... JTM1055-H105 ........ Quill Housing ........................................................ .................................... 1
105-1 ........ JTM1055-H105-1 ..... C-Clip ................................................................... .................................... 1
106 ........... JTM1055-H106 ........ Set Screw ............................................................. M6x8 ........................... 1
107 ........... TS-1502071 ............. Hex Socket Cap Screw ........................................ M5x45 ......................... 2
109 ........... JTM1055-H109 ........ Hex Nut ................................................................ .................................... 1
110 ........... JTM1055-H110 ........ C-Clip ................................................................... S22 .............................. 1
................. JTM1055-FRSC ....... Forward Reverse Switch Cover (not shown) ....... .................................... 1
................. JTM1055-SC ............ Short Cable from Switch to Breaker (not shown) . .................................... 1
23

12.3.1 Base Assembly – Exploded View

24

12.3.2 Base Assembly – Parts List

2 ............... JTM1055-B02 .......... Ram ...................................................................... .................................... 1
3 ............... JTM1055-B03 .......... Head Tilt Block ..................................................... .................................... 1
3-1 ............ JTM1055-B03-1 ....... Hex Socket Cap Screw ........................................ M10x95 ....................... 4
4-2 ............ JTM1055-B04-2 ....... Hex Nut ................................................................ .................................... 4
9 ............... JTM1055-B09 .......... Gib ........................................................................ .................................... 1
11 ............. JTM1055-B11 .......... Set Screw ............................................................. .................................... 1
13 ............. JTM1055-B13 .......... Set Screw ............................................................. M10X60....................... 2
18-1 .......... JTM1055-B18-1 ....... Round Head Screw .............................................. M5x10 ......................... 4
20 ............. C-133 ....................... Beaker .................................................................. .................................... 1
21 ............. C-134 ....................... Breaker Box Cover ............................................... .................................... 1
23 ............. JTM1055-B23 .......... Lead Screw Housing ............................................ .................................... 1
24-1 .......... TS-1503081 ............. Hex Socket Cap Screw ........................................ M6x35 ......................... 2
25-1 .......... JTM1055-B25-1 ....... Key ....................................................................... 5x5x20 ........................ 1
26-1 .......... TS-1503051 ............. Hex Socket Cap Screw ........................................ M6x20 ......................... 3
30 ............. JTM1055-B30 .......... Hex Nut ................................................................ .................................... 1
34 ............. JTM1055-B34 .......... Dial Ring ............................................................... .................................... 1
37 ............. JTM1055-B37 .......... Elevating Crank .................................................... .................................... 1
25
40-1 .......... JTM1055-B40-1 ....... Cross Head Screw ............................................... M5x20 ......................... 4
41 ............. JTM1055-B41 .......... Shaft ..................................................................... .................................... 1
41-1 .......... JTM1055-B41-1 ....... Key ....................................................................... 3x3x10 ........................ 1
41-2 .......... JTM1055-B41-2 ....... Key ....................................................................... 4x4x16 ........................ 1
42-1 .......... JTM1055-B42-1 ....... Set Screw ............................................................. M6x20 ......................... 1
44 ............. JTM1055-B44 .......... Gib Holder-L ......................................................... .................................... 1
45 ............. JTM1055-B045 ........ Gib ........................................................................ .................................... 2
46 ............. JTM1055-B46 .......... Adjusting Screw ................................................... .................................. 12
55 ............. JTM1055-B55 .......... Bushing ................................................................ .................................... 2
57 ............. JTM1055-B57 .......... Hex Nut ................................................................ .................................... 2
60 ............. JTM1055-B60 .......... Screw ................................................................... .................................. 22
64 ............. JTM1055-B64 .......... Stop Block ............................................................ .................................... 1
69 ............. JTM1055-B69 .......... Chip Guard Assembly (includes: #69-72) ............ .................................... 1
70 ............. ................................. Chip Guard-L........................................................ .................................... 1
71 ............. ................................. Chip Guard-M....................................................... .................................... 1
72 ............. ................................. Chip Guard-S ....................................................... .................................... 1
74 ............. JTM1055-B74 .......... Gib Holder-L ......................................................... .................................... 1
................. STRIPE-1-3/4 ........... JET Striping (not shown) ...................................... 1-3/4” W ............... per ft.
26

12.4.1 Lead Screw Assembly – Exploded View

27

12.4.2 Lead Screw Assembly – Parts List

1 ............... JTM1055-L01 ........... Nut ........................................................................ 1/2-20UNF .................. 3
7 ............... JTM1055-L07 ........... Dial Holder-(left) ................................................... .................................... 1
8 ............... JTM1055-L08 ........... Bear ing Sto p f or Y-Axis ........................................ .................................... 1
8N ............. JTM1055-L08N ........ Bearing Stop for X-Axis (serial no. 120xx xx and higher ) .......................... 2
9 ............... BB-6204ZZ ............... Ball Bearing .......................................................... .................................... 5
11 ............. JTM1055-L11 ........... Spri ng Pin............................................................. M5X20......................... 6
13 ............. JTM1055-L13 ........... Key ....................................................................... 3X3X25 ....................... 4
14 ............. JTM1055-L14N ........ Lead Screw for Ext. Bearing Bracket (serial no. 120xxxx and higher) ..... 1
20 ............. JTM1055-L20 ........... Cross Feed Bearing Bracket ................................ .................................... 1
22 ............. JTM1055-L22 ........... Adjustable Cross Feed Nut .................................. .................................... 2
25 ............. JTM1055-L25 ........... Lock Washer ........................................................ M6 ............................... 2
28

12.5.1 One Shot Lubrication System – Diagram

29

12.5.2 One Shot Lubrication System – Parts List

2 ............... ALMP-04 .................. Aluminum Pipe ..................................................... 13.5x450L ................... 1
3 ............... A-8............................ Oil Regulating Distributor ..................................... .................................... 1
4 ............... JTM1055-A4 ............ Oil Regulating Distributor ..................................... .................................... 1
6 ............... PH-4011 ................... Elbow joint ............................................................ .................................... 2
10 ............. PG-004 ..................... Union .................................................................... .................................... 1
13 ............. PD-401 ..................... Straight Joint ........................................................ .................................... 1
14 ............. A-14.......................... Nylon Piece .......................................................... 4X700.......................... 1
30

13.0 Electrical Connecti ons

13.1 Forward/Reverse Switch Wiring

31

13.2 Wiring Diagram

427 New Sanford Road
LaVergne, Tennessee 37086
Phone: 800-274-6848
www.jettools.com
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