Jet GH-1440 Operating Instructions And Parts Manual

Operating Instructions and Parts Manual

Geared Head Lathe 14x40 inch

Model GH-1440

JET

1.0 IMPORTANT SAFETY

INSTRUCTIONS

Read and understand the entire owner's manual before attempting set-up or operation of this lathe.

WARNING: To reduce risk of injury:

1. This machine is designed and intended for use by properly trained and experienced personnel only. If you are not familiar with the proper and safe use of lathes, do not use this machine until proper training and knowledge have been obtained.

2. Keep guards in place. Safety guards must be kept in place and in working order.

3. Remove adjusting keys and wrenches. Before turning on machine, check to see that any adjusting wrenches are removed from the tool.

4. Reduce the risk of unintentional starting. Make sure switch is in the OFF position before plugging in the tool.

5. Do not force tools. Always use a tool at the rate for which it was designed.

6. Use the right tool. Do not force a tool or attachment to do a job for which it was not designed.

7. Maintain tools with care. Keep tools sharp and clean for best and safest performance. Follow instructions for lubrication and changing accessories.

8. Always disconnect the tool from the power source before adjusting or servicing.

9. Check for damaged parts. Check for alignment of moving parts, breakage of parts, mounting, and any other condition that may affect the tool’s operation. A guard or any part that is damaged should be repaired or replaced.

10. Keep work area clean. Cluttered areas and benches invite accidents.

11. Keep work area well lighted.

12. Keep children and visitors away. All visitors should be kept a safe distance from the work area.

13. Make the workshop child proof. Use padlocks, master switches, and remove starter keys.

14. Wear proper apparel. Loose clothing, gloves, neckties, rings, bracelets, or other jewelry may get caught in moving parts. Non-slip footwear

is recommended. Wear protective hair covering to contain long hair. Do not wear any type of glove.

15. Always wear ANSI Z87.1 approved safety glasses or face shield while using this machine. (Everyday eyeglasses only have impact resistant lenses; they are not safety glasses.)

16. Do not overreach. Keep proper footing and balance at all times.

17. Do not place hands near the chuck or workpiece while the machine is operating.

18. Do not perform any set-up work while machine is operating.

19. Read and understand all warnings posted on the machine.

20. This manual is intended to familiarize you with the technical aspects of this lathe. It is not, nor was it intended to be, a training manual.

21. CALIFORNIA PROPOSITION 65 WARNING: This product contains chemicals known to the State of California to cause cancer, or birth defects or other reproductive harm.

22. This product, when used for welding, cutting, or working with metal, produces fumes, gases, or dusts which contain chemicals known to the State of California to cause birth defects and, in some cases, cancer. (California Health and Safety Code Section 25249.5 et seq.)

23. Do not attempt to adjust or remove tools during operation.

24. Never stop a rotating chuck or workpiece with your hands.

25. Choose a low spindle speed when working unbalanced workpieces, and for threading and tapping operations.

26. Do not exceed the maximum speed of the workholding device.

27. Do not exceed the clamping capacity of the chuck.

28. Workpieces longer than 3 times the chucking diameter must be supported by the tailstock or a steady rest.

29. Avoid small chuck diameters with large turning diameters.

30. Avoid short chucking lengths and small chucking contact.

31. Turn off the machine and disconnect from power before cleaning. Use a brush to remove shavings or debris — do not use bare hands.

32. Do not stand on the machine. Serious injury could occur if the machine tips over.

33. Never leave the machine running unattended. Turn the power off and do not leave the machine until moving parts come to a complete stop.

34. Remove loose items and unnecessary work pieces from the area before starting the machine.

35. Do not operate the lathe in flammable or explosive environments. Do not use in a damp environment or expose to rain.

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 or even fatal injury.

2.0 Table of contents

Section Page

1.0 IMPORTANT SAFETY INSTRUCTIONS ....................................................................................................... 2

2.0 Table of contents ............................................................................................................................................ 4

3.0 About this manual .......................................................................................................................................... 5

4.0 Specifications ................................................................................................................................................. 6

4.1 Cross Slide T-slot dimensions .................................................................................................................... 7

5.0 Uncrating ........................................................................................................................................................ 8

5.1 Contents of shipping container ................................................................................................................... 8

6.0 Installation ...................................................................................................................................................... 9

6.1 Chuck preparation (three jaw) .................................................................................................................... 9

7.0 Lubrication .................................................................................................................................................... 10

8.0 Coolant preparation ...................................................................................................................................... 12

9.0 Electrical connections .................................................................................................................................. 12

9.1 Voltage conversion (GH-1440-3 only) ...................................................................................................... 12

10.0 General description .................................................................................................................................... 13

11.0 Operation ................................................................................................................................................... 16

11.1 Break-in procedure ................................................................................................................................. 16

11.2 Feed and thread selection ...................................................................................................................... 17

11.3 Change gears replacement .................................................................................................................... 17

11.4 Automatic feed operation and feed changes .......................................................................................... 17

11.5 Powered carriage travel ......................................................................................................................... 18

11.6 Thread cutting ........................................................................................................................................ 18

11.7 Compound rest ....................................................................................................................................... 18

12.0 Adjustments ............................................................................................................................................... 18

12.1 Saddle .................................................................................................................................................... 18

12.2 Cross slide .............................................................................................................................................. 19

12.3 Compound rest ....................................................................................................................................... 19

12.4 Tailstock ................................................................................................................................................. 19

12.5 Tailstock off-set ...................................................................................................................................... 19

12.6 Tailstock gibs .......................................................................................................................................... 19

12.7 Headstock alignment .............................................................................................................................. 20

12.8 Removing gap bridge ............................................................................................................................. 20

12.9 Installing gap bridge ............................................................................................................................... 20

12.10 Belt replacement and adjustment ......................................................................................................... 21

12.11 Aligning tailstock to headstock ............................................................................................................. 21

13.0 Operation tables ......................................................................................................................................... 22

13.1 Thread table ........................................................................................................................................... 22

13.2 Feed table .............................................................................................................................................. 22

14.0 Replacement Parts ..................................................................................................................................... 22

14.1.1 Headstock Assembly I – Exploded View ............................................................................................. 23

14.1.2 Headstock Assembly I – Parts List ...................................................................................................... 24

14.2.1 Headstock Assembly II – Exploded View ............................................................................................ 26

14.2.2 Headstock Assembly II – Parts List ..................................................................................................... 27

14.3.1 Headstock Assembly III – Exploded View ........................................................................................... 28

14.3.2 Headstock Assembly III – Parts List .................................................................................................... 29

14.4.1 Gearbox Assembly I – Exploded View ................................................................................................ 30

14.4.2 Gearbox Assembly I – Parts List ......................................................................................................... 31

14.5.1 Gearbox Assembly II – Exploded View ............................................................................................... 33

14.5.2 Gearbox Assembly II – Parts List ........................................................................................................ 34

14.6.1 Apron Assembly I – Exploded View .................................................................................................... 36

14.6.2 Apron Assembly I – Parts List ............................................................................................................. 37

14.7.1 Apron Assembly II – Exploded View ................................................................................................... 38

14.7.2 Apron Assembly II – Parts List ............................................................................................................ 39

14.8.1 Saddle and Cross Slide Assembly – Exploded View .......................................................................... 40

14.8.2 Saddle and Cross Slide Assembly – Parts List ................................................................................... 41

14.9.1 Top Slide and Tool Post – Exploded View .......................................................................................... 43

14.9.2 Top Slide and Tool Post – Parts List ................................................................................................... 44

14.10.1 Tailstock Assembly – Exploded View ................................................................................................ 45

14.10.2 Tailstock Assembly – Parts List ......................................................................................................... 46

14.11.1 Bed and Shaft Assembly – Exploded View ....................................................................................... 47

14.11.2 Bed and Shaft Assembly – Parts List ................................................................................................ 48

14.12.1 Stand and Brake Assembly – Exploded View ................................................................................... 50

14.12.2 Stand and Brake Assembly – Parts List ............................................................................................ 51

14.13.1 End Gear Assembly – Exploded View ............................................................................................... 52

14.13.2 End Gear Assembly – Parts List ....................................................................................................... 53

14.14.1 Follow Rest – Exploded View ............................................................................................................ 54

14.14.2 Follow Rest – Parts List ..................................................................................................................... 54

14.15.1 Thread Dial Assembly – Exploded View ........................................................................................... 55

14.15.2 Thread Dial Assembly – Parts List .................................................................................................... 55

14.16.1 Steady Rest – Parts List .................................................................................................................... 56

14.16.2 Steady Rest – Parts List .................................................................................................................... 57

14.17.1 Coolant and Work Light Assembly – Exploded View ........................................................................ 58

14.17.2 Coolant and Work Light Assembly – Parts List ................................................................................. 58

14.18.1 Chuck Guard Assembly – Exploded View ......................................................................................... 59

14.18.2 Chuck Guard Assembly – Parts List .................................................................................................. 59

14.19.1 Lead Screw Cover Assembly – Exploded View ................................................................................ 60

14.19.2 Lead Screw Cover Assembly – Parts List ......................................................................................... 60

14.20.1 Accessories I – Exploded View ......................................................................................................... 61

14.20.2 Accessories I – Parts List .................................................................................................................. 62

14.21.1 Accessories II – Exploded View ........................................................................................................ 63

14.21.2 Accessories II – Parts List ................................................................................................................. 63

14.22.1 Electrical Components – Exploded View ........................................................................................... 64

14.22.2 Electrical Components – Parts List ................................................................................................... 64

15.0 Electrical Connections ................................................................................................................................ 65

15.1 Wiring Diagram – 1 Phase ..................................................................................................................... 65

15.2 Wiring Diagram – 3 Phase ..................................................................................................................... 66

16.0 Warranty and service ................................................................................................................................. 67

3.0 About this manual

This manual is provided by JET, covering the safe operation and maintenance procedures for a JET Model GH1440 Lathe. This manual contains instructions on installation, safety precautions, general operating procedures, and maintenance instructions. Your machine has been designed and constructed to provide consistent, long-term operation if used in accordance with the instructions as set forth in this document.

This manual is not intended to be a training guide for lathe operations, or tool and workpiece selection. Consult a machinery handbook or shop supervisor for information on proper speed and feed rates for specific materials, or type of cutter suitable for a particular operation. W hatever accepted methods or materials are us ed, always make personal safety a priority.

Note: The Figures in this manual may or may not show your exact lathe model, but the procedures will be identical.

If there are questions or comments, please contact your local supplier or JET. JET c an 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 as sembly

or operation! Failure to comply may ca use serious injury!

Register your product using the mail-in card provided, or register online: http://www.jettools.c om/us/en/serviceand-support/warranty/registration/

4.0 Specifications

Table 1

Model number Stock number 322830 322840

Motor and Electricals

Motor type TEFC induction Horsepower 3 HP (2.2 kW) Phase single 3 Voltage 230V only 230/460V (prewired 230V) Cycle 60 Hz Listed FLA (full load amps) 18 A 8.3 / 4.2 A Start capacitor Run capacitor Motor speed 1720 RPM Power cord 3 x 2.5 mm2 4x 2.5 mm2 Power plug installed n/a Recommended circuit size 1 25 A 15 A Sound emission without load 2 78dB 78dB

Capacities

Swing over bed 14 in. (356 mm) Swing over cross slide 8-3/16 in. (208 mm) Distance between centers 40 in. (1016 mm) Swing through gap 20 in. (508 mm) Length of gap 9-3/8 in. (238 mm) Steady rest capacity 1/4 to 3-1/2 in. (6.4 to 89 mm) Follow rest capacity 1/4 to 2-5/8 in. (6.4 to 66.7 mm)

Headstock

Hole through spindle 1-1/2 in. (38 mm) Spindle nose D1-4 Taper in spindle nose MT5 Spindle taper adaptor MT3 Spindle bearing type Taper roller bearing Number of spindle speeds 12 Range of spindle speeds 40-1800 RPM

Gearbox

Number of longitudinal and cross feed rates 40 Range of longitudinal feeds 0.0012 – 0.0294 in./rev Range of cross feeds 0.0004 – 0.0103 in./rev Number of inch threads 40 Range of inch threads 4 – 112 TPI Number of metric threads 23 Range of metric threads 0.45 – 7.5 mm Leadscrew 7/8 x 49-1/2 in. 8TPI Feed rod diameter 3/4 in. (19 mm)

Compound and carriage

Tool post type 4-way Maximum tool size 5/8 x 5/8 in. Maximum compound slide travel 3-1/2 in. (89 mm) Maximum cross slide travel 6-3/8 in. (162 mm) Maximum carriage travel 37-1/2 in. (953 mm)

GH-1440-1 GH-1440-3

350V/400μF

450v/40μF

n/a n/a

GH-1440-1 GH-1440-3

Tailstock

Tailstock spindle travel 4-3/4 in. (121 mm) Diameter of tailstock spindle 1-3/4 in. (45 mm) Taper in tailstock spindle MT3

Main materials

Headstock Cast iron Bed Cast iron Apron/Saddle Cast iron Tailstock Cast iron Splash guard Steel Stand Steel

Dimensions

Bed width 10-3/16 in. (259 mm) Bed length 54-1/2 in. (1384 mm) Height of bed from floor 12-3/4 in. (324 mm) Overall dimensions, L x W x H 74-4/5 x 28 x 46 in. (1900 x 635 x 1168 mm) Shipping dimensions, L x W x H 78-3/8 x 30 x 55 in. (1990 x 760 x 1400 mm)

Weights

Net weight, approx. 2,116 lb (960 kg) Shipping weight, approx. 2,336 lb (1060 kg)

subject to local and national electrical codes.

The specified values are emission levels and are not necessarily to be seen as safe operating levels. As workplace conditions vary, this information is intended to allow the user to make a better estimation of the hazards and risks involved only.

L = length, W = width, H = height, TPI = threads per inch n/a = not applicable 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.

4.1 Cross Slide T-slot dimensions

These dimensions (in millimeters) can be used to cut an appropriately sized block for a quick change tool post.

Figure A1

5.0 Uncrating

Open shipping crate and check for shipping damage. Report any damage immediately to your distributor and shipping agent. Do not discard any shipping material until the Lathe is assembled and running properly.

Compare the contents of your crate with the following parts list to make sure all parts are intact. Missing parts, if any, should be reported to your distributor.

Read and understand the entire contents of this manual before attempting set-up or operation. Failure to comply may cause serious injury!

5.1 Contents of shipping container

1 Lathe 1 Steady Rest (mounted on lathe) 1 Follow Rest (mounted on lathe) 1 6" Three Jaw Chuck w/ Top Reversing Jaws

(mounted on lathe)

1 8" Four Jaw Chuck with Backplate (strapped to

container) 1 12" Face Plate (strapped to container) 1 Backplate 1 Tool Box (p/n GH1440-TBCP)

Tool Box Contents (p/n GH1440-TBCP):

(Fig. 1)

1 No. 1 Cross Point Screwdriver 1 No. 1 Flat Blade Screwdriver 4 Open End Wrench (9-11, 10-12, 12-14, 17-19mm) 7 Hex Socket Wrench (2,2.5, 3, 4, 5, 6, 8mm) 2 Shear Pins 1 30T Change Gear 1 32T Change Gear 2 40T Change Gear 2 Handles 1 Can, Gray Touchup Paint 1 Oil Gun 1 Live Center 2 No. 3 Morse Taper Dead Center 1 No. 5 to No. 3 Spindle Sleeve 6 Leveling Pads 6 Leveling Bolts with Hex Nuts 2 Hex Socket Cap Screw 1 Chuck Key 1 Key for Cam Locks 1 Tool Post Wrench 1 Taper Piece 1 Operating Instructions and Parts Manual 1 Product Registration Card

Figure 1

6.0 Installation

1. Finish removing the wooden crate from around

the lathe.

2. Unbolt the lathe from the shipping crate

bottom.

3. Choose a location for the lathe that is dry, has

good lighting, and has enough room to service

the lathe on all four sides

4. Place two steel rods or pipes (of sufficient

strength) into four holes (A, Fig. 2) of lathe

stand. Sling the lathe with properly rated

straps. Do not lift by spindle. W ith adequate

lifting equipment, slowly raise the lathe off the

shipping crate bottom. Make sure lathe is

balanced before moving.

5. To avoid twisting the bed, the lathe's location

must be absolutely flat and level. Check for a

level condition using a machinist's precision

level on the bedways both front to back and

side to side. The leveling pads included in the

tool box and the leveling screws in the lathe

base will help you to reach a level condition.

The lathe must be level to be accurate.

6. Clean all rust protected surfaces using a mild

commercial solvent, kerosene or diesel fuel.

Do not use paint thinner, gasoline, or lacquer

thinner, as these can damage painted

surfaces. Cover all cleaned surfaces with a

light film of Mobil DTE® Oil Heavy Medium.

7. Open the end gear door. Clean all

components of the end gear assembly and

coat all gears with Mobilith® AW 1. Close the

door.

Figure 2

6.1 Chuck preparation (three jaw)

Read and understand all

directions for chuck preparation. Failure to comply may cause serious injury and/or damage to the lathe!

Note: Before removing the chuck from the spindle,

place a way board across the bedways under the chuck

1. Support the chuck while turning three

camlocks (Fig. 3) 1/4 turn counter-clockwise

with the chuck key enclosed in the tool box.

2. Carefully remove the chuck from the spindle

and place on an adequate work surface.

3. Inspect the camlock studs. Make sure they

have not become cracked or broken during

transit. Clean all parts thoroughly with solvent.

Also clean the spindle and camlocks.

Figure 3

4. Cover all chuck jaws and scroll inside the

chuck with Mobilith® AW2. Cover the spindle,

cam locks, and chuck body with a light film of

Mobil DTE® Oil Heavy Medium.

5. Lift the chuck up to the spindle nose and press

onto the spindle. Tighten in place by turning

the cam locks 1/4 turn clockwise. The index

mark (A, Fig. 3) on the camlock should be

between the two indicator arrows (B, Fig. 3). If

the index mark is not between the two arrows,

remove the chuck and adjust the camlock

studs by either turning out one full turn (if

cams will not engage) or turning in one full turn

(if cams turn beyond indicator marks).

6. Install chuck and tighten in place.

7.0 Lubrication

Lathe must be serviced at all

lubrication points and all reservoirs filled to operating level before the lathe is put into service. Failure to comply may cause serious damage to the lathe.

1. Headstock – Oil must be up to indicator mark

in oil sight glass (A, Fig. 4). Top off with Mobil

DTE® Oil Heavy Medium. Fill by pulling plug

(D, Fig. 4). To drain, remove drain plug (A, Fig.

5) with an 8mm hex wrench. Drain oil

completely and refill after the first month of

operation. Clean out any metal shavings.

Then, change oil in the headstock annually.

2. Gearbox – Oil must be up to indicator mark in

oil sight glass (B, Fig. 4). Top off with Mobil

DTE® Oil Heavy Medium. Fill by lifting off

thread chart cover (E, Fig. 4) and remove plug

(C, Fig. 4) with an 8mm hex wrench. To drain,

remove drain plug (A, Fig. 6) with an 8mm hex

wrench. Drain oil completely and refill after the

first month of operation. Then, change oil in

the Gearbox annually.

Figure 4

Figure 5

Figure 6

3. Apron – Oil must be up to indicator mark in oil

sight glass (A, Fig. 7). Top off with Mobil

DTE® Oil Heavy Medium. Remove oil cap (B,

Fig. 7) on top of apron to fill. To drain, remove

drain plug on bottom of apron. Drain oil

completely and refill after the first month of

operation. Then, change oil in the apron

annually.

4. Leadscrew Feed Rod – Lubricate ball oiler

(A, Fig. 8) on leadscrew/feed rod bracket with

Mobil DTE® Oil Heavy Medium once daily.

5. Tailstock – Lubricate two ball oilers (B, Fig. 8)

on tailstock with Mobil DTE® Oil Heavy

Medium once daily.

6. Cross Slide – Lubricate four ball oilers (A, Fig.

9) with Mobil DTE® Oil Heavy Medium once

daily.

7. Compound Rest – Lubricate one ball oiler (B,

Fig. 9) with Mobil DTE® Oil Heavy Medium

once daily.

8. Carriage – Lubricate four ball oilers (D, Fig. 9)

with Mobil DTE® Oil Heavy Medium once

daily.

Figure 7

Figure 8

Figure 9

8.0 Coolant preparation

Follow coolant manufac-

turer’s recommendations for use, care and disposal.

1. Remove rear access cover on tailstock end.

Make sure coolant tank has not shifted during

transport and is located properly under the

recovery chute (Fig. 10).

2. Pour three gallons of coolant mix into drip pan.

3. After machine has been connected to power,

turn on coolant pump and check to see coolant

is cycling properly.

4. Fasten coolant door to stand.

9.0 Electrical connections

Electrical connections must be made by a qualified electrician in compliance with all relevant codes. This machine must be properly grounded to help prevent electrical shock and possible fatal injury.

The GH-1440-1 lathe is rated at 3HP, singlephase, 230V only. The GH-1440-3 lathe is rated

at 3HP, 3-phase, 230V/460V (prewired 230V). Confirm power available at the lathe's location is the same rating as the lathe.

Lathe Power Source Junction Box: Remove the cover. Run the main power through the strain relief bushing and attach the ground, followed by power leads. Replace the cover.

Main Power Switch: Located on the backside of the machine. Turns the power to the machine on and off.

Make sure the lathe is properly grounded.

Power is connected properly when pulling up on the forward-reverse lever causes spindle to rotate counterclockwise as viewed from tailstock. If the chuck rotates in clockwise direction, disconnect lathe from power source, switch two of three power leads, and re-connect lathe to power source.

Figure 10

Main Motor: Change the wires according to the diagram on inside of motor junction box.

Transformer: Remove electrical panel on rear of machine, headstock side, and switch wire from 230V terminal to 460V terminal as outlined on the transformer.

Coolant Pump: Open access panel on base at tailstock end. Change wires in coolant pump junction box according to diagram on inside of junction box cover.

9.1 Voltage conversion (GH-1440-3

only)

Disconnect machine from

power source. Failure to comply may cause serious injury!

To switch from 230- to 460-volt operation:

10.0 General description

Lathe bed

The lathe bed (A, Fig. 11) is made of high grade cast iron. By combining high cheeks with strong cross ribs, a bed with low vibration and high rigidity is realized. Two precision ground v-slideways, reinforced by heat hardening and grinding, are an accurate guide for the carriage and headstock. The main drive motor is mounted in the stand below headstock.

Headstock

The headstock (B, Fig. 11) is cast from high grade, low vibration cast iron. It is bolted to the bed by four screws with two adjusting screws for alignment. In the head, the spindle is mounted on two precision taper roller bearings. The hollow spindle has Morse Taper #5 with a 1-1/2" bore.

Carriage

The carriage (A, Fig. 12) is made from high quality cast iron. The sliding parts are smooth ground. The cross slide is mounted on the carriage and moves on a dovetailed slide which can be adjusted for play by means of the gibs.

The compound slide (B, Fig. 12), which is mounted on the cross slide (C, Fig. 12), can be rotated through 360°. The top slide and the cross slide travel in a dovetail slide and have adjustable gibs. A four way tool post is fitted on the top slide.

Four way tool post

The four way toolpost (D, Fig. 12) is mounted on the top slide and allows a maximum of four tools to be mounted simultaneously. Remember to use a minimum of two clamping screws when installing a cutting tool.

Apron

Figure 11

Figure 12

The apron (E, Fig. 12) is mounted to the carriage. In the apron a half nut is fitted. The half nut gibs can be adjusted from the outside. The half nut is engaged by use of a lever. Quick travel of the apron is accomplished by means of a bedmounted rack and pinion, operated by a handwheel on the front of the apron.

Tailstock

The tailstock (A, Fig. 13) slides on a v-way and can be locked at any location by a clamping lever. The tailstock has a heavy duty spindle with a Morse Taper #3.

Leadscrew and feed Rod

The leadscrew (B, Fig. 13) and feed rod (C, Fig.

13) are mounted on the front of the machine bed. They are connected to the gearbox at the left for automatic feed and lead, and are supported by bushings on both ends. Both are equipped with brass shear pins.

Figure 13

Gear box

The gear box (D, Fig. 13) is made from high quality cast iron and is mounted to the left side of the machine bed.

Steady rest

The steady rest (E, Fig. 13) serves as a support for shafts on the free tailstock end. The steady rest is mounted on the bedway and secured from below with a bolt, nut and locking plate. The sliding fingers require continuous lubrication at the contact points with the workpiece to prevent premature wear.

To set the steady rest:

1. Loosen three hex socket screws.

2. Loosen knurled screw and open sliding fingers

until the steady rest can be moved with its fingers around the workpiece. Secure the steady rest in position.

3. Set the fingers snugly to the workpiece and

secure by tightening three hex socket cap screws. Fingers should be snug but not overly tight. Lubricate sliding points with Mobil DTE® Oil Heavy Medium.

4. After prolonged use, the fingers will show

wear. Re-mill or file the tips of the fingers.

Figure 13 (repeated)

Follow rest

The traveling follow rest (F, Fig. 13) is mounted on the saddle and follows the movement of the turning tool. Only two fingers are required as the place of the third is taken by the turning tool. The follow rest is used for tuning operations on long, slender workpieces. It prevents flexing of the workpiece from the pressure of the cutting tool.

The sliding fingers are set similar to the steady rest, free of play, but not binding. Always lubricate with Mobil DTE® Oil Heavy Medium.

Controls

1. Control Panel - located on front of gearbox.

A. Coolant On-Off Switch (A, Fig. 14) –

turns coolant pump on and off.

B. Power Indicator Light (B, Fig. 14) –

illuminated whenever lathe has power. Emergency Stop Switch (C, Fig. 14) –

press to stop all machine functions. Caution: Lathe will still have power. To restart machine, rotate button clockwise until it disengages.

C. Jog Switch (D, Fig. 14) – Press and

release to advance spindle momentarily.

Figure 14

2. Headstock Gear Change Levers (E, Fig. 14)

– located on front of headstock. Move levers according to speed chart for desired setting.

3. Leadscrew/Feed Rod Directional Lever (F,

Fig. 14) – located on front of headstock. Moving the lever up causes carriage travel toward the tailstock; moving the lever down causes carriage travel toward the headstock (when chuck is spinning in forward or counterclockwise direction). Do not move lever while machine is running.

4. Feed/Lead Selector Lever (G, Fig. 14) –

located on the front of the headstock. Used whenever setting up for threading or feeding.

In the "A" position, never

run the lathe higher than 650 RPM.

5. Feed/Lead Selector Lever (H, Fig. 14) –

located on the front of the gearbox. Used in setting up for feeding and threading. Positions "F" and "D" are for the feed rod. Positions "E" and "C" are for the feed screw. Position "0" is neutral.

6. Lock Knob (I, Fig. 14) – located on the front

of the gearbox. With the knob in the six o'clock position, feed/lead selector knob (J, Fig. 14) may be adjusted. With the knob in the twelve o'clock position, the feed/lead selector knob (J, Fig. 14) is locked.

7. Feed/Lead Selector Knob (J, Fig. 14) –

located on front of the gearbox. Used for setting up for feeding and threading.

8. Compound Lock (A, Fig. 15) – hex socket

screw located on left side of compound. Turn clockwise to lock and counterclockwise to unlock.

9. Carriage Lock (B, Fig. 15) – lock handle

located on top of carriage. Turn clockwise to lock. Turn counterclockwise to unlock.

Figure 14 (repeated)

Carriage lock must be

unlocked before engaging automatic feeds or damage to lathe may occur.

10. Longitudinal Traverse Hand Wheel - (D,

Fig. 15) – located on the apron assembly. Rotate hand wheel clockwise to move the apron assembly toward the tailstock. Rotate the wheel counterclockwise to move the apron assembly toward the headstock.

11. Feed Selector (E, Fig. 15) – located in the

center front of the apron assembly. Pushing lever to the left and down activates the crossfeed function. Pulling lever to the right and up activates the longitudinal function.

Figure 15

12. Half Nut En gage Lever ( thread cutting) (F,

Fig. 15) – located on front of the apron. Move the lever down to engage. Move the lever up to disengage.

13. Cross Traverse Handwheel (G, Fig. 15) –

located above the apron assembly. Rotate clockwise or counter-clockwise to move, or position.

14. Compound Rest Traverse Handwheel (H,

Fig. 15) – located on the end of the compound slide. Rotate clockwise or counterclockwise to move, or position.

15. Tool Post Clamping Lever (J, Fig. 15) –

located on top of the tool post. Rotate counter-clockwise to loosen and clockwise to tighten.

16. Tailstock Quill Cla mping Lever (A, Fig. 16)

– located on the tailstock. Lift up to lock the spindle. Push down to unlock.

17. Tailstock Clamping Lever (B, Fig. 16) –

located on the tailstock. Lift up lever to lock. Push down lever to unlock.

18. Tailstock Quill Traverse Handwheel (C,

Fig. 16) – located on the tailstock. Rotate clockwise to advance the quill. Rotate counter-clockwise to retract the quill.

19. Tailstock Off-Set Adjustment (D, Fig. 16) –

Two hex socket cap screws located on the tailstock base are used to off-set the tailstock for cutting tapers. Loosening one screw while tightening the other off sets the tailstock.

20. Foot Brake (A, Fig. 17) – located between

stand pedestals. Depress to stop all lathe functions.

21. Micro Carriage Stop (B, Fig. 17) – located

on the lathe bed. Loosen two hex socket cap screws underneath body and slide along bed to desired position. Tighten screws to hold in place.

22. Main Power Sw itch (not shown) – located on

the electrical box door on the rear of the lathe. Turns main power to the lathe on and off.

Figure 16

Figure 17

11.0 Operation

11.1 Break-in procedure

During manufacture and testing, this lathe has been operated in the low R.P.M. range for three hours.

To allow time for the gears and bearings to breakin and run smoothly, do not run the lathe above 650 R.P.M. for the first six hours of operation.

11.2 Feed and thread selection

1. Refer to the feed and thread charts found on

the gear box faceplate (A, Fig. 18 and sect.

13.0 of this manual).

2. Move levers (B, C, D, E, F, Fig. 18) to the

appropriate positions according to the chart.

11.3 Change gears replacement

The 25T, 127T, 50T gears are installed in the end gear compartment when delivered from the factory. This combination will cover most inch feeds and threads under normal circumstances.

The 30T, 32T, and two 40T gears found in the tool box are used with different combinations as indicated on feed and thread tables (A, Fig. 18).

1. Disconnect machine from power source

(unplug).

2. Open the door on the left end of the

headstock.

3. Loosen nuts (A & B, Fig. 19).

4. Move quadrant (C, Fig. 19) out of the way and

hold in place temporarily by tightening nut (B, Fig. 19).

5. Remove hex socket cap screws (D and/or E,

Fig. 19), depending on which gear is to be changed.

6. Install new gear(s) and tight en in place with a

hex socket cap screw.

7. Loosen nut (B, Fig. 19), move quadrant back

so teeth mesh on gears, and tighten nuts (A & B, Fig. 19).

CAUTION: Make sure there is a backlash of .002”-.003” between gears. Setting the gears too tight will cause excessive noise and wear.

8. Close the door and connect machine to power

source.

Figure 18

Figure 19

11.4 Automatic feed operation and

feed changes

1. Move the forward/reverse se lector (A, Fig. 20)

up or down depending on desired direction.

2. Set selector levers (A, B, C, D, Fig. 21) to

desired rate. Note: For feeding, lever (D) will be set at "F"

or "D", depending on desired feed rate.

Figure 20

11.5 Powered carriage travel

1. Push lever (B, Fig. 20) to the left and down to

engage crossfeed.

2. Pull lever to the right and up to engage

longitudinal feed.

11.6 Thread cutting

1. Set forward/reverse lever (A, Fig. 20) up or

down depending on the desired direction.

2. Set selector levers (A, B, C, D, Fig. 21) to

desired rate. Note: For threading, lever (D) will be set at

"C" or "E", depending on desired thread.

3. Push lever (B, Fig. 19) to the right.

4. Engage the half nut lever (C, Fig. 20).

5. To cut inch threads, refer to the feed and

thread tables. The half nut lever and the threading dial are used to thread in the conventional manner. The thread dial chart specifies at which point a thread can be entered using the threading dial.

6. To cut metric threads, the half nuts must be

left continually engaged once the start point has been selected and the half nut is initially engaged (thread dial cannot be used).

Figure 21

11.7 Compound rest

The compound rest is located on top of the cross slide and can be rotated 360 degrees. Loosen the two socket head cap screws (A, Fig. 22) on the compound rest base. There is a calibrated dial in degrees (B, Fig. 22) below the rest to assist in placement of the compound to the desired angle.

12.0 Adjustments

After a period of time, wear in some of the moving components may need to be adjusted:

12.1 Saddle

1. Locate four hex nuts found on the bottom rear

of the cross slide and back off one full turn each.

2. Turn each of the four set screws with a hex

wrench until a slight resistance is felt. Do not over tighten these screws.

3. Move the carriage with the handwheel and

determine if the drag is to your preference. Readjust the set screws as necessary to achieve the desired drag.

4. Hold the socket set screw firmly with a hex

wrench and tighten the hex nut to lock the set screw in place.

Figure 22

5. Move the carriage again and readjust if

necessary. Note: Over-adjustment will cause excessive

and premature wear of the gibs.

12.2 Cross slide

If the cross slide is too loose, follow procedure below to tighten:

1. Loosen the rear gib screw (not shown)

approximately one turn.

2. Tighten the front gib screw (B, Fig. 23) a

quarter turn. Turn the cross slide handwheel to see if the cross slide is still loose. If it is still loose, tighten the front screw a bit more and try again.

3. When the cross slide is properly adjusted,

tighten the rear gib screw.

Note: Over-adjustment will cause excessive and premature wear of the gibs.

12.3 Compound rest

Follow the same procedure as the cross slide adjustment to adjust the compound rest. Rear gib screw is shown (A, Fig. 23). Front gib screw (not shown) is by the handwheel.

12.4 Tailstock

Figure 23

If the handle (A, Fig. 24) will not lock the tailstock, follow the procedure below :

1. Lower the handle to the unlocked position.

2. Slide the tailstock to an area that allows

access to the underside of the tailstock.

3. Tighten tailstock clamping bolt (underside of

tailstock) 1/4 turn. Test for proper locking. Repeat as necessary.

12.5 Tailstock off-set

Follow the procedure below to off-set the tailstock to cut shallow tapers:

1. Lock tailstock in position by raising locking

handle (A, Fig. 24).

2. Alternately loosen and tighten two hex socket

cap screws (B, Fig. 24).

12.6 Tailstock gibs

Take up play in the tailstock by tightening two gib screws (C, Fig. 24) on either side of the tailstock base.

Note: Do not over-tighten. Excessive tightening will lead to premature wear of the gibs and mating parts

Figure 24

12.7 Headstock alignment

The headstock has been aligned at the factory and should not require adjustment. However, if adjustment is deemed necessary, follow the procedure below to align the headstock:

1. Using a machinist's precision level on the

bedways, make sure the lathe is level side to side and front to back. If the lathe is not level, correct to a level condition before proceeding. Re-test alignment if any leveling adjustments were made.

2. From steel bar stock of approximately two

inches in diameter, cut a piece approximately eight inches long.

3. Place two inches of bar stock into chuck and

tighten chuck. Do not use the tailstock or center to support the other end.

4. Set up and cut along five inches of bar stock.

5. Using a micrometer, measure the bar stock

next to the chuck and at the end. The measurement should be the same.

6. If the measurements are not the same and

adjustment is required, loosen hex socket cap screws (A, Fig. 25) which hold the headstock to the bed. Do not loosen completely; some drag should remain.

7. Adjust two screw nuts (B, Fig. 25) located on

the endgear side of the headstock. Loosen one and tighten the other. Make another cut. Keep adjusting screw nuts after each cut until the bar stock measurements are the same. Tighten all headstock screws.

Figure 25

12.8 Removing gap bridge

1. To remove gap bridge, locate two nuts (A, Fig.

26) in the center of the gap bridge.

2. Using an open end wrench, tighten the two

nuts. This will cause the taper pins to release. Remove the taper pins.

3. Remove six hex socket cap screws (B, Fig.

26) with a hex wrench.

4. Gap bridge can now be removed.

12.9 Installing gap bridge

1. Clean the bottom and the ends of the gap

bridge thoroughly.

2. Set gap bridge in place and align.

3. Remove nuts from the taper pins.

4. Slide taper pins in their respective holes and

seat using a mallet. Install nuts on the taper pins finger tight.

5. Install six s ocket head cap screws and tighten

securely.

Figure 26

12.10 Belt replacement and

adjustment

1. Disconnect machine from the power

source (unplug).

2. Open the end gear cover and lower cover on

the headstock side.

3. Take tension off old belts by loosening motor

mount hex nut (A, Fig. 27).

4. Remove belts. Install new belts onto pulleys.

5. Tension by tightening motor mount hex nut

until 8 lbs. force causes approximately 3/4" deflection on belts.

6. Close end gear door, install cover and connect

lathe to the power source.

12.11 Aligning tailstock to headstock

Before proceeding, headstock should be aligned. See sect. 12.7, Headstock Alignment.

1. Fit a 12" ground steel bar between centers of

the headstock and tailstock (Fig. 28).

2. Fit a dial indicator to the compound slide and

traverse the center line of the bar, using the carriage movement.

3. If tailstock adjustment is needed, alternately

loosen and tighten front and rear hex socket cap screws (A, Fig. 29).

Figure 27

Figure 28

Figure 29

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Jet GH-1440 Operating Instructions And Parts Manual

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Frequently Asked Questions

User Manual