JET 414499, 414478, 414472 User Manual

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Operating Instructions and Parts Manual

10” x 16” Horizontal Band Saw

Models J-7020, J-7040

JET

1.0 Warranty and Service

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 Friday.

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 Co vered

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 maintenance.

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 provi de proof of initia l p u rch a s e whe n 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 S tate 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 WARRANTI ES 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 information and are not binding. 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

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; Woodworking Machinery used for industrial or commercial purposes 5 Year – Woodworking Machinery Limited Lifetime – JET Parallel clamps; VOLT Series Electric Hoists; Manual Hoists; Manual Hoist 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.

branded products are not sold in Canada by JPW Industries, Inc.

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 machine and manual ..................................................................................................................... 6

5.0 Specifications ................................................................................................................................................. 6

6.0 Machine setup ................................................................................................................................................ 8

6.1 Uncrating and spotting ................................................................................................... ............................ 8

7.0 Electrical connections .................................................................................................................................... 8

8.0 Operating instructions .................................................................................................................................... 8

8.1 Controls ...................................................................................................................................................... 8

8.2 Setting blade speed .................................................................................................................................... 8

8.3 Raising/lowering saw head ......................................................................................................................... 9

8.4 Controlling the cut: Hydraulic feed control .................................................................................................. 9

8.5 Evaluating cutting efficiency ....................................................................................................................... 9

8.6 Blade selection ......................................................................................................................................... 10

8.7 Blade break-in procedures ....................................................................................................................... 10

9.0 Work setup ................................................................................................................................................... 10

9.1 Securing workpiece for square cuts ......................................................................................................... 10

9.2 Adjusting vise for angle cuts ..................................................................................................................... 10

9.3 Installation and adjustment of work stop .................................................................................................. 11

10.0 Starting the Saw ......................................................................................................................................... 11

10.1 Coolant flow ............................................................................................................................................ 12

10.2 Coolant mixture and quantity .................................................................................................................. 12

11.0 Adjustments ............................................................................................................................................... 12

11.1 Blade tracking adjustment ...................................................................................................................... 12

11.2 Factory or field procedure ...................................................................................................................... 12

11.3 Blade guide bearing adjustment ............................................................................................................. 13

11.4 Test cutting to verify adjustment accuracy ............................................................................................. 14

11.5 Limit switch adjustment .......................................................................................................................... 14

12.0 Maintenance ............................................................................................................................................... 14

12.1 Cleaning ................................................................................................................................................. 14

12.2 Lubrication .............................................................................................................................................. 15

12.3 Changing blades .................................................................................................................................... 15

12.4 Changing drive belt ................................................................................................................................ 15

12.5 Replacing drive motor ............................................................................................................................ 16

12.6 Adjusting counterbalance spring ............................................................................................................ 16

12.7 Replacing drive wheel ............................................................................................................................ 16

12.8 Replacing idler wheel or idler bearing .................................................................................................... 16

12.9 Adjusting blade guides ........................................................................................................................... 16

12.10 Replacing carbide blade guide ............................................................................................................. 17

12.11 Replacing guide bearings ..................................................................................................................... 17

12.12 Replacing blade edge bearings ............................................................................................................ 17

12.13 Replacing wire brush ............................................................................................................................ 17

13.0 Troubleshooting the J-7020/7040 Band Saws ........................................................................................... 18

14.0 Replacement Parts ..................................................................................................................................... 19

14.1.1 Base (J-7020/7040) – Exploded View ................................................................................................. 20

14.1.2 Base (J-7020/7040) – Parts List ......................................................................................................... 21

14.2.1 Head (J-7020/7040) – Exploded View ................................................................................................. 24

14.2.2 Head (J-7020/7040) – Parts List ........................................................................................................ 25

15.0 Electrical Connections ................................................................................................................................ 28

15.1 Electrical Connections – single phase only (model J-7020) ................................................................... 28

15.2 Electrical Connections – three phase only (model J-7040) .................................................................... 29

General Machinery Warnings

3.0 Safety Warnings

General Cautions

- Misuse of this machine can cause serious injury.

- For safety, the machine must be set up, used and serviced properly.

- Read, understand and follow the instructions in the operator’s and parts manual which was shipped with your machine.

When setting up the machine:

- Always avoid using the machine in damp or poorly lighted work areas.

- Always be sure the machine is securely anchored to the floor or the work bench.

- Always keep the machine guards in place.

- Always put the start switch in the “OFF” position before plugging in the machine.

When using the machine:

- Never operate the machine with safety guards missing.

- Always wear safety glasses with side shields (See ANSI Z87.1)

- Never wear loose clothing or jewelry.

- Never overreach; you may slip and fall into the machine.

- Never leave the machine running while unattended.

- Always shut the machine off when not i n use.

When servicing the machine:

- Always unplug the machine from the electrical power before servicing.

- Always follow the instructions in the operators and parts manual when changing accessory tools or parts.

- Never modify the machine without consulting Walter Meier (Manufacturing) Inc.

You — the stationary power tool user — hold the key to safe ty.

Read and follow these simple rules for best results and full benefits from your machine. Used properly, JET machinery is among the best in design and safety. However, any machine used improperly can be rendered inefficient and unsafe. It is mandatory that those who use our products be properly trained in how to use them correctly. They should read and understand the Operator’s and Parts Manual as well as all labels affixed to the machine. Failure in following all of these warnings can cause serious injuries.

1. Always wear protective eye wear when operating machinery. Eye wear shall be impact resistant, protective safety glasses with side shields which comply with ANSI Z87.1 specifications. Use of eye w ear whic h does not comply with ANSI Z87.1 specifications could result in severe injury from the breakage of the eye protection.

2. Wear proper apparel. No loose clothing or jewelry which can get caught in moving parts. Rubber soled, nonslip, footwear is recommended for best footing.

3. Do not overreach. Failure to maintain a proper working position can cause you to fall into the machine or cause your clothing to get caught — pulling you into the machine.

4. Keep guards in place and in proper working order. Do not operate the machine with the guards removed.

5. Avoid dangerous working environments. Do not use stationary machine tools in wet or damp locations. Keep work areas clean and well lit.

6. Special electrical precautions should be taken when working on flam mable materials.

7. Avoid accidental starts by being sure that the start switch is in the “OFF” position before plugging in the machine.

8. Never leave the machine running while unattended. The machine shall be shut off whenever it is not being u sed.

9. Disc onnect the elec tri cal po wer bef ore ser vici ng, whenever changing accessories or when general maintenance is done on the machine.

10. Maintain all machine tools with care. Follow all maintenance instructions for lubricating and the changing of accessories. No attempt shall be made to modify or have makeshift repairs done to the machine. This not only voids the warranty but also renders the machine unsafe .

11. If there is any risk of tipping or sliding, the machinery must be anchored to the floor.

12. Secure your work. Use clamps or a vise to hold your work, when practical. It is safer than using your hands and it frees both hands to operate the machine.

13. Never brush chips away while the machine is in operation.

14. Keep work area clean. Cluttered areas invite accidents.

15. Remove adjusting keys and wrenches before turning the machine on.

16. Use the right tool. Don’t force a tool or attachment to do a job for which it was not designed.

17. Use only recommended accessories and follow manufacturer’s instructions pertaining to them.

18. Keep hands in sight and clear of all moving parts and cutting surfaces.

19. All visitors should be kept at a safe distance from the work area. Make your workshop completely safe by using padlocks, master switches, or by removing starter keys.

20. Know the tool you are using; its application, limitations, and potential hazards.

General Electrical Cautions

This machine should be grounded in accordance with the National Electrical Code and local codes and ordinances. The work should be done by a qualified electrician. The machine should be grounded to protect the user from electrical shock.

Wire Sizes

CAUTION: For circuits that are a great distance from

the electrical service box, the wire size must be increased in order to deliver ample voltage to the motor. To minimize power losses and to prevent motor overheating and burnout, the use of wire sizes for branch circuits or electrical extension cords according to the following table is recommende d:

Conductor

length

240 volt lines 120 volt lines

0-50 feet No. 14 No. 14

50-100 feet No. 14 No. 12

Over 100 f eet No. 12 No. 8

AWG (American Wire Gauge) number

Safety Instructions on Sawing Syst ems

1. Always wear leather gloves when handling saw blade. The operator shall not wear gloves when operating the machine.

2. All doors shall be closed, all panels rep laced, and other safety guards in place prior to the machine being started or operated.

3. Be sure that the blade is not in contact with the workpiece when the motor is started. The

motor shall be started and you should allow the saw to achieve full speed before bringing the saw blade into contact with the workpiece.

4. Keep hands away from the blade area.

5. Remove any cut off piece carefully while keeping your hands free of the blade area.

6. Saw must be stopped and electrical supply must be cut off before any blade replacement or adjustment of blade support mechanism is done, or before any attempt is made to change the drive belts or before any periodic service or maintenance is performed on the saw.

7. Remove all loose items and unnecessary workpieces from the area before starting machine.

8. Bring adjustable saw guides and guards as close as possible to the workpiece.

9. Always wear protective eye wear when operating, servicing, or adjusting machinery. Eyewear shall be impact resistant, protective safety glasses with side shields complying with ANSI Z87.1 specifications. Use of eye wear which does not comply with ANSI Z87.1 specifications could result in severe injury from breakage of eye protection.

10. 10. Nonslip footwear and safety shoes are recommended.

11. Wear ear protectors (plugs or muffs) during extended periods of operation.

12. The workpiece, or part being sawed, must be securely clamped before the saw blade enters the workpiece.

13. Remove cut off pieces carefully, keeping hands away from saw blade.

14. Saw must be stopped and electrical supply disconnected before reaching into cutting area.

15. Avoid contact with coolant, especiall y guarding your eyes.

Familiarize yourself with the following safety notices used in this manual:

This means that if preca utions are not heeded, it m ay result in minor injury a nd/or possible

machine damage.

This means that if precautions are not heeded, it may result in serious injury or possibly even

death.

4.0 About this machine and manual

The JET Models J-7020 and J-7040 Horizontal Cut-Off Band Saws are ruggedly built, precision-oriented machines designed for either wet or dry applications. The 2-horsepower motor along with the worm gear reduction drive train in an oil bath, transmits smooth and positive power to the blade. This drive system coupled with the recirculating coolant system keeps the blade running cool and true, which results in longer blade life. The blade guide system has adjustable six-point contact using a combination of bearing and carbide blocks. The vise is a rapid acting, three jaw design.

This manual is provided by JET covering the safe operation and maintenance procedures for the J-7020 and J7040 Horizontal Band Saws. 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 attem pting assembly

or operation! Failure to comply may cause serious injury!

5.0 Specifications

Model number ..................................................... J-7020 .................................. J-7040 .............................. J-7040-4

Stock number ..................................................... 414472 ................................. 414478 ................................ 414499

Mot or and electricals:

Main motor ty p e ................................................... .. .. ..total ly enclos ed fan coole d , in d uctio n ..................................

Horsepower .................................... 1-1/2 HP (1.1kW) ......................... 2HP (1.5kW) ........................2HP (1.5kW)

Phase............................................................... single ........................................... 3 ......................................... 3

Voltage ....................................................... 115/230V .............................. 230/460V ............................ 230/460V

(prewired 230V) (prewired 230V) (prewire d 460V)

Cycle ................................................................. 60Hz ..................................... 60Hz ................................... 60Hz

Listed FLA ( f ull load amps) ............................ 22A /11 A ......................................... 6A ....................................... 3A

Start capacitor ................................ 300MFD 250VAC ...........................................-- ......................................... --

Run capacitor ...................................... 40μF 250VAC ...........................................-- ......................................... --

Starting amps ............................................. 80A / 40A ....................................... 26A ..................................... 13A

Running amps (no load) ............................. 15A / 7.6A ......................................... 8A ....................................... 4A

Power cord length ................................................ 6 ft. ....................................... 6 ft. ..................................... 6 ft.

Power plug installed ............................................... no ......................................... no ....................................... no

Power transfer ......................belt and stepless pulleys ........ belt and stepless pulleys ...... belt and stepless pulleys

Motor speed .............................................. 1720 RPM ............................. 1720 RPM ........................... 1720 RPM

Recommended circuit size

Sound emission ................................................ 80 dB .................................... 80 dB .................................. 80 dB

Coolant pump:

Horsepower ........................................ 1/8HP (0.1kW) ...................... 1/8 H P (0.1kW) ..................... 1/8HP (0 .1 kW)

Phase............................................................... single ........................................... 3 ......................................... 3

Voltage ....................................................... 115/230V .............................. 220/440V ............................ 220/440V

Listed FLA ( f ull load amps) .......................... 0.5/0.2 5A ................................ 0.2/0.1A .............................. 0.2/0.1 A

Speed .............................................. 2850/3400 RPM .................... 2850/3400 RPM .................. 2850/3400 RPM

Cycle ................................................................. 60Hz ..................................... 60Hz ................................... 60H z

Flow rate ................................................. 1 gal. p/min ........................... 1 gal. p/min ......................... 1 gal. p/min

subject to local/national electrical codes

........................... 30A/15 A ....................................... 15A ..................................... 10 A

Speeds and capacities:

Blade speed .............................. variable 100-350 fpm ............. variable 100-350 fpm ........... v ariable 100-350 fpm

Round capacity at 90-degrees ................ 10” (25 5mm) ......................... 10 ” (2 5 5mm) ........................10” (2 5 5mm)

Round capacity at 45-degrees ................ 10” (25 5mm) ......................... 10 ” (2 5 5mm) ........................10” (2 5 5mm)

Rectangular capacity at 90-de gre es .....7”x1 6”/1 0”x 1 0” ....................... 7”x16”/1 0”x1 0” ..................... 7”x16”/10 ”x10 ”

Rectangular capacity at 45-de gre es ........... 6-1/ 2”x 11” ............................. 6-1 /2”x 11” ............................6-1/2 ”x11 ”

Coolant reservoir capacity ................................. 8 gal. .................................... 8 gal. ................................... 8 gal.

Dimensions:

Blade size ................................... 1x0.04x135” 4/6TPI ............... 1x 0.04x135” 4/6TPI ............. 1 x 0.0 4x 135” 4/6TPI

Blade wheel diameter ............................ 14” (360mm) ......................... 14” (360mm) ........................14” (360mm)

Bed height from floor........................ 23-1/2” (597mm) ................... 23-1/2” (597mm) .................. 23-1/2” (597mm)

Floor space required .......................... 75-1/2”x3 3”x 41 ” ..................... 75-1/2”x 33”x 4 1” ................... 75-1/2”x 33”x 4 1”

(1918x838x1042mm) (1918x838x1042mm) (1918x838x1042mm)

Bed working surfa ce ........................... 17-1 /2” Wx24 ”L ...................... 17-1 /2” Wx24 ”L .....................1 7-1/2 ”Wx24”L

(445x610mm) (445x610mm) (445x610mm)

Overa ll siz e ..................................... 79”Lx31” Wx4 1 ”H ................... 79”L x 31”Wx41 ”H ................. 79”L x 31”Wx41”H

(2007x788x1042mm) (2007x788x1042mm) (2007x788x1042mm)

Shipp ing crate ................................. 76”Lx30” Wx4 6 ”H ................... 76”L x 30”Wx46 ”H ................. 76”L x 30”Wx46”H

(1931x762x1170mm) (1931x762x1170mm) (1931x762x1170mm) Materials:

Bed and motor support.................................. cast iron ................................ cast iron .............................. cast iron

Blade wheels ................................................ cast iron ............................... cast iron .............................. c ast iron

Bow frame ..........................................................steel ...................................... stee l .................................... ste e l

Stand .................................................................steel ...................................... steel .................................... s tee l

Blade guides .................... carbide blocks/ball bearing .... carbide blocks/ball bearing ... carbide blocks/ball bearing

Weights:

Net weight ........................................ 927 lb (420.5kg) .................... 927 lb (420.5kg) .................. 927 lb (420.5kg)

Shipping weight ................................... 973 lb (441kg) ....................... 973 lb (441kg) ..................... 973 lb (441kg)

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.

6.0 Machine setup

The saw delivered to you has been adjusted at the factory. A number of test pieces have been cut using the saw to verify the accuracy of cutting. Therefore, the only setup operations required before releasing the saw for service are spotting the saw and establishing the electrical connections to the motor.

6.1 Uncrating and spotting

Spot the saw where it makes the m ost sense for the operations you will probably be doing. If you are going to be doing cut-off work on very long pieces of stock, allow plenty of room for the stock, and the infeed and outfeed support s. Remove the saw from the shipping skid and discard any holddown devices that were used to secure the saw to the skid.

7.0 Electrical connections

JET recommends that any wiring involving hard wiring of the saw to a branch, or any change of voltage supplied to the motor be performed by a licensed electrician.

Observe the following when connecting to the power source (wiring diagrams are shown in section 15.0):

1. Make sure the saw is disconnected from the

power source, or that the fuses have been removed or breakers tripped in the circuit in which the saw will be connected. Place a warning placard on the fuse or circuit breaker to prevent accidental electrical shock.

2. If you are installing the motor power cor d into a

receptacle, make sure to use the appropriate plug.

3. If you are using hard-wired connections to a

junction box, connect the wires in the box, and close the box.

4. Install the fuses or reset the breaker.

5. The saw is now ready for service. It is recommended that the single phase band saw

(model J-7020), when operated on 115 volt power, be connected to a dedicated 30 am p circuit with a 30 amp circuit breaker or time-delay fuse marked “D”. When operated on 230 volt power, use a dedicated 15 amp circuit with a 15 amp circuit breaker or time-delay fuse marked “D”.

It is recommended that the three phase band saw (model J-7040) on 230 volt power be connected to a dedicated 15 amp circuit with a 20 amp circuit breaker or time-delay fuse marked “D”; and f or 460 volt power, a dedicated 10 amp circuit with a 20 amp circuit breaker or time-delay fuse marked “D”.

NOTE: Local codes take precedence over recommendations.

8.0 Operating instructions

8.1 Controls

The operating controls for the saw are provided in a control panel on the left side of the machine. The control panel is mounted on a pivoting tube. The pivoting tube allows the operator to position the control panel in a convenient location.

Figure 1: Control panel

1. A power-on light is provided on the left side of the control panel. The power-on light indicates when power is connected to the machine.

2. An emergency stop button is provided on the control panel. The emergency stop button provides a means to rapidly cut off electrical power.

3. The saw motor pushbutton switch starts the saw motor and the E-stop button stops the saw motor.

4. A green pushbutton switch is provided to the right of the emergency stop pushbutton. The pushbutton opens an electro-magnetic valve in the hydraulic cylinder circuit. Opening the valves allows the saw head to move downward and put the saw blade in contact with the workpiece.

5. A red release button on the electro-magnetic valve provides a means to lower the saw head when power to the machine has been disconnected (see Figure 4).

6. The rate at which the saw head moves downward is controlled by a hydraulic feed rate control located on the top, rear of the saw head (see Figure 3).

7. A coolant pump switch is provided on the electrical equipment box on the back of the machine (see figure 2).

8.2 Setting blade speed

1. The blade speed is controlled by an adjustment mechanism on the right end of the saw. Speed increases when the adjustment

knob is turned counterclockwise. Speed decreases when the knob is turned clockwise.

2. A placard on the drive belt guard provides recommended speeds for various materials.

3. A speed indicator is provided on the barrel of the adjustment mechanism. The indicator provides speed indications in feet per minute and meters per minute. (The meters per minute values are shown in parenthesis o n the indicator.)

4. The feed rates on the placard are expressed in meters per minute. The feed rate graduations available on the indicator may not match the recommended feed rate. An approximate speed may therefore be required. For example, to set a speed rate of 25 meters per minute, the indicator would be set about midway between 21 meters-per-minute and the 30 meters-per-minute graduations.

8.4 Controlling the cut: Hydraulic

feed control

The weight of the saw arm provides all the force needed to move the saw blade through the workpiece. In fact, if the full weight of the arm is allowed to make the cut, rapid blade wear and poor cutting accuracy will result. A hydraulic feed control is provided that gives the operator a means to control the speed and efficiency of cutting.

The hydraulic cylinder is attached between the saw base and the saw head. The hydraulic cylinder resists movement of the saw head in the downward direction. However, the hydraulic cylinder offers no resistance when the saw head is raised upward.

The amount of downward force can be controlled by using the feed rate control valve. When the valve is opened slightly, the saw head will move downward. The further the valve is opened, the faster the saw head will move downward.

To change speed, the saw

motor must be operating.

5. Turn the speed adjustment knob to the desired rate setting as determined by the material being cut.

Figure 2: Coolant pump switch

8.3 Raising/lowering saw head

1. Lift the saw head using the ha ndle on the far left side of the saw head.

2. To lower the saw head, press the green pushbutton on the right side of the control panel.

The feed control is adjusted by the operator until the saw is operating efficiently. This is usually determined by observing the chip formation. (See section 8.5, Evaluati ng cutting efficiency, for m ore information.)

Figure 3: Controls

3. To adjust the feed rate, adjust the feed rate control valve knob on the top of the saw head (see Figure 3).

4. To lower t he saw head w ith power of f , pull and turn the red knob (manual override) on the electro-magnetic valve (see Figure 4).

Figure 4: Lowering head with power off

8.5 Evaluating cutting efficiency

Is the blade cutting efficiently? The best way to determine this is to observe the chips formed by the cutting blade.

If the chip formation is powdery, then the feed rate is much too light, or the blade is dull.

If the chips formed are curled, but colored — that is, either blue or straw-colored from heat generated during the cut — then the feed rate is too high.

If the chips are slightly curled and are not colored by heat — the blade is sufficiently sharp and is cutting at its most efficient rate.

8.6 Blade selection

The cut-off saw is provided with a saw blade that is adequate for a variety of cut-off jobs on a variety of common materials. A 4/6 vari tooth bi-metal blade (5674011) and a 6/10 vari tooth bi-metal blade (5674021) are available from JET.

See sect. 8.2, Setting blade speed, for the recommended speeds for various materials. These selections, while appropriate for many shop cutting needs, do not encompass the wide variety of blades of special configuration (tooth pitch and set) and special alloys for cutting unusual or exotic materials.

A coarse blade could be used for a solid steel bar but a finer tooth blade would be used on a thin-wall tube. In general, the blade choice is determined by the thickness of the material; the thinner the material, the finer the tooth pitch.

A minimum of thr ee teet h should be on the work piece at all times for proper cutting. The blade and workpiece can be damaged i f the t eeth are so far apart that they str addle the workpiece.

For very high production on cutting of special materials, or to cut hard-to-cut materials such as stainless steel, tool steel, or titanium, you can ask your industrial distributor for more specific blade recomm endations. Also, the supplier who provides the workpiece material should be prepared to provide you with very specific instructions regarding the best blade (and coolant or cutting fluid, if needed) for the material and shape supplied.

3. When the saw has completed 1/3 of the cut, increase the feed rate slightly and allow the saw to complete the cut.

4. Keep the same hydraulic cylinder setting and begin a second cut on the same or similar workpiece.

5. When the blade has completed about 1/3 of the cut, increase the feed rate. Watch the chip formation until cutting is at its most efficient rate and allow the saw to complete the cut (see sect. 8.5, Evaluating blade efficiency). The blade is now considered ready for regular service.

9.0 Work setup

9.1 Securing workpiece for square

cuts

1. Raise the saw head (refer to Figure 5).

2. Slide the left vise jaw far enough to the left to allow the workpiece to be placed in the vise.

3. Place the workpiece on the work table. If the workpiece is long, provide support at the ot her end. It may also be necessary to provide additional downward clamping to hold the workpiece securely on the work table.

4. Turn clamping hand wheel clockwise to c lamp the workpiece in position against the fixed (right) vise jaw.

5. After completing the cut, turn the clamping hand wheel counterclockwise and slide the left jaw away from the workpiece.

8.7 Blade break-in procedures

New blades are v ery sharp a nd, theref ore, have a tooth geometry which is easily damaged if a careful break-in procedure is not followed. Consult the blade manufacturer’s literature for break-in of specifi c blades on specific materi als. However, the following procedure will be adequate for br eak-i n of J ET-suppli ed bl ades on lower alloy ferrous materials.

1. Clamp a round section workpiece in the vise. The workpiece should be 2 inc hes or larger in diameter.

2. Set the saw on low speed. Start t he cut with a very light feed rate.

Figure 5: Securing workpiece

9.2 Adjusting vise for angle cuts

1. Referring to Figure 6, loosen the angle locking screw and the pivot screw on the left vise jaw.

2. Turn the locking handle on the round, anglesetting block counterclockwise to unlock the block. Slide the block until t he pointer on the block is aligned with desired angle (see Figure

7). Tighten the locking handle to set the angle.

3. Set the workpiece in the vise. Put the front end of the workpiece against the cor ner of t he rig ht

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