JET HBS-1220MSA, HBS-1220MSAH Operating Instructions and Parts Manual

Operating Instructions and Parts Manual

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12”x20” Semi-Automatic Variable-Speed Mitering Band Saw

Models HBS-1220MSA, HBS-1220MSAH

JET

1.0 IMPORTANT SAFETY

INSTRUCTIONS

WARNING – To reduce risk of injury:

1. Read and understand the entire owner's manual before attempting assembly or operation.

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 warning labels if they become obscured or removed.

4. This band saw is designed and intended for use by properly trained and experienced personnel only. If you are not familiar with the proper and safe operation of a band saw, do not use until proper training and knowledge have been obtained.

5. Do not use this band saw 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.

6. Always wear leather gloves when handling saw

blades. The operator shall not wear gloves when operating the machine.

7. Machinery must be anchored to the floor.

8. Secure work. Use clamps or a vise to hold work,

when practical. It is safer than using your hands and it frees both hands to operate the machine.

9. All doors shall be closed, all panels replaced,

and other safety guards in place prior to the machine being started or operated.

10. 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 come up to full speed before bringing the saw blade into contact with the workpiece.

11. Keep hands away from the blade area.

12. Remove any cut off piece carefully while

keeping your hands free of the blade area.

13. 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.

14. Remove loose items and unnecessary

workpieces from area before starting machine.

15. Bring adjustable saw guides and guards as

close as possible to the workpiece.

16. 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.

17. Wear proper apparel. No loose clothing or

jewelry which can get caught in moving parts. Confine long hair.

18. Anti-skid floor strips, nonslip footwear and

safety shoes are recommended.

19. Wear hearing protection (plugs or muffs) if

sound reaches unsafe levels.

20. The workpiece, or part being sawn, must be

securely clamped before the saw blade enters the workpiece.

21. Remove cut off pieces carefully, keeping hands

away from saw blade.

22. Saw must be stopped and electrical supply cut

off or machine unplugged before reaching into cutting area.

23. Avoid contact with coolant, especially guarding

your eyes.

24. Make certain the switch is in the OFF position before connecting the machine to the power supply.

25. This saw must be grounded in accordance with

the National Electrical Code and local codes and ordinances. This work should be done by a qualified electrician. The saw must be grounded to protect the user from electrical shock. Caution: For circuits which are far away 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 recommended.

AWG (American Wire

Conductor

length 0-50 ft. # 14 50-500 ft. # 14 Over 100 ft. # 12

Gauge) Number

240 volt lines

Table 1

26. Disconnect electrical power before servicing.

Whenever changing accessories or general maintenance is done on the machine, electrical power to the machine must be disconnected before work is done.

27. Remove adjusting keys and wrenches. Form a habit of checking to see that keys and adjusting wrenches are removed from the machine before turning it on.

28. Keep safety 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 after completion of maintenance.

29. Check damaged parts. Before further use of the machine, a guard or other part that is damaged should be carefully checked to determine that it will operate properly and perform its intended function. Check for alignment of moving parts, binding of moving parts, breakage of parts, mounting and any other conditions that may affect its operation. A guard or other part that is damaged should be properly repaired or replaced.

30. Maintain all machine tools with care. Follow all

maintenance instructions for lubricating and the changing of accessories.

31. 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.

32. Keep work area clean. Cluttered areas invite accidents. Keep the floor around the machine clean and free of scrap material, oil and grease.

33. Keep visitors a safe distance from the work area. Keep children away.

34. Make your workshop child proof with padlocks, master switches or by removing starter keys.

35. Give your work undivided attention. Looking around, carrying on a conversation and “horseplay” are careless acts that can result in serious injury.

36. Maintain a balanced stance at all times so that you do not fall into the blade or other moving parts. Do not overreach or use excessive force to perform any machine operation.

37. Use the right tool at the correct speed and feed rate. Do not 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.

38. Use only recommended accessories; improper accessories may be hazardous.

39. Keep saw blades sharp and clean for the best and safest performance.

40. Turn off the machine before cleaning. Use a brush or vacuum to remove chips or debris — do not use bare hands. Never brush away chips while machine is in operation.

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

42. Never leave the machine running unattended. Turn the power off and do not leave the machine until it comes to a complete stop.

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

WARNING: This product can expose you to chemicals including cadmium and DEHP which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to http://www. p65warnings.ca.gov.

WARNING: Some dust, fumes and gases created by power sanding, sawing, grinding, drilling, welding and other construction activities contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are:

 lead from lead based paint  crystalline silica from bricks, cement and

other masonry products  arsenic and chromium from chemically

treated lumber Your risk of exposure varies, depending on how often you do this type of work. To reduce your exposure to these chemicals, work in a wellventilated area and work with approved safety equipment, such as dust masks that are specifically designed to filter out microscopic particles. For more information go to http://www.p65warnings.ca.gov/ and http://www. p65warnings.ca.gov/wood.

SAVE THESE INSTRUCTIONS

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.

not heeded, it may result in serious, or possibly even fatal, injury.

This means that if precautions are

2.0 Table of contents

Section Page

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

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

3.0 Machine introduction ...................................................................................................................................... 5

4.0 About this manual .......................................................................................................................................... 5

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

6.0 Setup and assembly ....................................................................................................................................... 7

6.1 Shipping contents ....................................................................................................................................... 7

6.2 Tools required for assembly ....................................................................................................................... 7

6.3 Uncrating and spotting ............................................................................................................................... 7

6.4 Assembly .................................................................................................................................................... 7

6.5 Lubrication .................................................................................................................................................. 7

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

7.1 Voltage conversion ..................................................................................................................................... 8

8.0 Adjustments ................................................................................................................................................... 8

8.1 Removing and installing blade ................................................................................................................... 8

8.2 Blade tension .............................................................................................................................................. 9

8.3 Blade tracking ............................................................................................................................................. 9

8.4 Blade guide bracket adjustment ................................................................................................................. 9

8.5 Blade guide bearing adjustment ............................................................................................................... 10

8.6 Test cutting to verify adjustment ............................................................................................................... 10

8.7 Changing blade speed ............................................................................................................................. 11

8.8 Broken blade safety device ...................................................................................................................... 11

8.9 Vise adjustments ...................................................................................................................................... 11

8.10 Adjusting work stop ................................................................................................................................ 12

8.11 Limit switch adjustment .......................................................................................................................... 12

8.12 Miter angle adjustment ........................................................................................................................... 12

9.0 Operating controls ........................................................................................................................................ 13

10.0 Operation ................................................................................................................................................... 13

10.1 Manual mode .......................................................................................................................................... 13

10.2 Automatic mode ..................................................................................................................................... 13

10.3 Blade selection ....................................................................................................................................... 14

10.4 Blade break-in procedure ....................................................................................................................... 14

10.5 Evaluating cutting efficiency ................................................................................................................... 14

11.0 User-maintenance ...................................................................................................................................... 14

11.1 Lubrication .............................................................................................................................................. 15

11.2 Additional servicing ................................................................................................................................ 16

11.3 Lubrication schedule .............................................................................................................................. 16

12.0 Blade speed recommendations .................................................................................................................. 17

13.0 Troubleshooting HBS-1220MSA/MSAH ..................................................................................................... 17

14.0 Replacement Parts ..................................................................................................................................... 18

14.1.1 HBS-1220MSA/MSAH Base Assembly – Exploded View ................................................................... 19

14.1.2 HBS-1220MSA/MSAH Oil Pump Assembly – Exploded View ............................................................ 20

14.1.3 HBS-1220MSA/MSAH Base Assembly – Parts List ............................................................................ 21

14.2.1 HBS-1220MSA/MSAH Bow Assembly – Exploded View .................................................................... 24

14.2.2 HBS-1220MSA/MSAH Bow Assembly – Parts List ............................................................................. 25

14.3.1 HBS-1220MSA/MSAH Control Box Assembly – Exploded View ........................................................ 28

14.3.2 HBS-1220MSA/MSAH Control Box Assembly – Parts List ................................................................. 29

14.4.1 HBS-1220MSA/MSAH Electrical Box Assembly – Exploded View ..................................................... 30

14.4.2 HBS-1220MSA/MSAH Electrical Box Assembly – Parts List .............................................................. 30

15.0 Electrical Connections ................................................................................................................................ 31

15.1.1 HBS-1220MSA wiring diagram ............................................................................................................ 31

15.1.2 HBS-1220MSA wiring diagram (cont.) ................................................................................................ 32

15.1.3 HBS-1220MSA electrical panel diagram ............................................................................................. 32

15.2.1 HBS-1220MSAH wiring diagram ......................................................................................................... 33

15.2.2 HBS-1220MSAH wiring diagram (cont.) .............................................................................................. 34

15.2.3 HBS-1220MSAH electrical panel diagram .......................................................................................... 35

15.3.1 HBS-1220MSA/MSAH voltage conversion diagrams .......................................................................... 35

16.0 Warranty and service ................................................................................................................................. 36

3.0 Machine introduction

The JET HBS-1220MSA series Mitering Band Saws incorporate a number of design features and innovations to make these saws a powerful and productive addition to machine shops, maintenance shops, tool rooms, and fabrication and welding shops.

The swivel control panel allows the operator access to all machine controls from either side of machine. The 6point contact blade guide assemblies ensure greater accuracy and longer blade life. The semi-automatic cycle enables the operator to initiate these steps from the control panel: coolant flow, blade start, bow down, rate of descent, blade stop, bow up. Additionally, the MSAH model allows control panel operation of the hydraulic vise.

This highly versatile band saw is a proven time saver, offering optimal sawing performance.

Mail the provided registration card, or register your product online -

http://www.jettools.com/us/en/service-and-support/warranty/registration/

4.0 About this manual

This manual is provided by JET, covering the safe operation and maintenance procedures for a JET Model HBS1220MSA and HBS-1220MSAH Horizontal Band Saw. 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 consistent, long-term operation if used in accordance with the instructions 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!

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.

5.0 Specifications

Table 2

Stock number Model number HBS-1220MSA HBS-1220MSAH

Motor and Electricals

Main motor type TEFC induction

Horsepower 3 HP (2.25 kW) Phase 3 PH Voltage 230/460 V (prewired 230 V) 1 Cycle 60 Hz Listed FLA (full load amps) 8.5/4.2 A

Motor speed 1720 RPM On/off switch Magnetic Power transfer Drive belt with variable speed pulley Power cable and plug Recommended circuit size 2 15 A Sound emission 3 75 dB Hydraulic motor 1/2 HP (0.37 kW), 3PH, 230/460V, 60Hz, 1.91/0.96 A Vise operation manual hydraulic Coolant pump 1/8 HP (0.09 kW), 3PH, 230/460V, 60Hz, 0.2/0.1 A

Capacities

Round

Square (WxH)

Rectangle (WxH)

90 deg. 300 mm (11-13/16 in.) 45 deg. 285 mm (11-7/32 in.) 90 deg. 300 x 300 mm (11-13/16 x 11-13/16 in.) 45 deg. 285 x 285 mm (11-7/32 x 11-7/32 in.)

90 deg.

45 deg. 285 x 320 mm (11-7/32 x 12-9/16 in.) Maximum jaw opening 500 mm (19-5/8 in.) Blade size (WxTxL) 27 x 0.95 x 3960 mm (1 x 0.037 x 156 in.) Blade wheel size (Dia. x W) Ø434 x 30 mm (17-3/32 x 1-3/16 in.) Blade speed Variable, 90-370 SFPM Gearbox 850 mL (1/4 gal.) Hydraulic tank 1.5L (3/8 gal.) Cutting fluid/coolant tank 39.9 L (10-1/2 gal.)

Main materials

Stand Steel Bow Cast iron and steel Blade wheels Cast iron Bed Cast iron Vise jaws Cast iron

General dimensions

Height of bed from floor 700 mm (28 in.) Overall dimensions, assembled (LxWxH) 2210 x 800 x 1346 mm (87 x 31.5 x 53 in.) Shipping dimensions (LxWxH) 2230 x 820 x 1350 mm (87.8 x 32.28 x 53.14 in.)

Weights

Net weight (approx.) 650 kg (1430 lb.) 659 kg (1450 lb.) Shipping weight (approx.) 730 kg (1606 lb.) 739 kg (1625 lb.)

Conversion to 460V requires purchase of additional components. See sect. 7.1.

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, T = thickness, Dia = diameter, SFPM=surface feet per minute

424476 424475

not supplied

420 x 300 mm (16-1/2 x 11-13/16 in.)

460 x 220 mm (18-1/8 x 8-5/8 in.)

490 x 100 mm (19-1/4 x 4 in.)

Read and understand the entire

contents of this manual before attempting assembly or operation. Failure to comply may cause serious injury.

6.0 Setup and assembly

6.1 Shipping contents

and front-to-back. Adjust leveling screws until machine is level in both directions and tighten nuts.

7. Clean all rust preventative from surfaces with kerosene or cleaner/degreaser. Do not use gasoline, paint thinner, mineral spirits, etc., as these may damage painted surfaces. After cleaning, apply a light coat of oil to exposed metal surfaces.

1 Band saw 1 Chip tray 1 Work stop assembly: 1 Work stop with handle 1 Work stop rod 1 Work stop bracket 1 Plastic knob 1 Operating Instructions and Parts Manual 1 Product registration card 1 Factory-cut test piece 1 Tool box (HBS1221MSA-TB), containing: 4 Hex cap screws M12x70 (for leveling) 4 Hex nuts M12 (for leveling) 1 Phillips screwdriver 1 Flat blade screwdriver 4 Hex wrenches, 3,4,5,6mm 2 Open end wrenches, 11/13, 17/19mm 1 Set of keys (electrical panel access)

6.2 Tools required for assembly

All tools needed for assembly are provided in the tool box. Additional tools may be necessary for maintenance and adjustments.

6.3 Uncrating and spotting

1. Finish uncrating the saw and inspect for damage. Should any have occurred, contact your local distributor. Do not discard packing material until saw is assembled and running satisfactorily.

2. Compare contents of shipping carton with the contents list in this manual. Report shortages, if any, to your distributor.

3. Remove four screws holding machine to shipping pallet.

4. Leave any packing material between vise clamps and bow intact until band saw has been lifted to its final position.

5. Use lifting straps that are isolated from the band saw’s finished surfaces and clear of any handles or levers; lift machine and place in desired location. For best performance, the band saw should be located on a solid and level foundation. Allow room for servicing and for moving large stock around the machine when determining location.

6. Install four leveling screws with hex nuts (provided) into flanges on base. Place a level on the table surface and check side-to-side

6.4 Assembly

Install chip tray on edge of base above the two screws (see cover photo).

Mount control panel support box to machine base, as shown in Figure 6-1. (Note: Do not cut straps holding cables to control panel support.)

Figure 6-1

6.5 Lubrication

The band saw is shipped with appropriate levels of gear and hydraulic oil. The user should verify these by checking sight glass levels before operating.

Cutting fluid or coolant must be supplied by the operator. See sect. 11.0 for information.

7.0 Electrical connections

Electrical connections must be made by a qualified electrician in compliance with all relevant codes. This machine must be properly grounded while in use to protect the operator from electrical shock and possible fatal injury.

The HBS-1220MSA and HBS-1220MSAH band saw is rated at 230/460V, 3 phase. It is prewired for 230 volt. Confirm that power available at the saw’s location matches that for which the saw is wired.

To access electrical panel, push button on rear door to make handle pop outward, then rotate handle counterclockwise. Keys are provided in the tool box for locking the electrical panel door.

Before wiring, make sure saw is disconnected from power source or that the fuses have been removed or breakers tripped in the circuit to which the saw will be connected. Use appropriate Lock-Out/Tag-

Out procedures.

After wiring, if saw runs backward, disconnect from power and switch any two of the three power leads. Before connecting to power source, be sure switch is in off position.

7. Replace two 230V fuses with two 460V/1A fuses (p/n HBS1220MSA-FU1A).

8. Close all covers before starting the saw.

Figure 7-1

8.0 Adjustments

Disconnect saw from power source before making adjustments, unless indicated otherwise.

7.1 Voltage conversion

The band saw can be converted from 230V to 460V operation; consult wiring diagram labels on the appropriate junction boxes on machine. Diagrams are also found at back of this manual. (Note: In case of discrepancy, labels on machine take precedence.)

Conversion will require additional 460V components. See your dealer or contact JET to purchase these items.

1. Make sure saw is disconnected from power source, or fuses removed or breakers tripped in the circuit to which saw is being connected.

2. Change incoming power leads into wiring terminal box on right side of base.

3. Change incoming leads on main motor, hydraulic motor, and coolant pump, inside the respective junction boxes.

Open the machine’s electrical panel (refer to Figure 7-1):

4. On the transformer, move R1 wire from 240V to 460V terminal.

5. Replace 230V Overload Relay for Oil Pump with 460V Overload Relay for Oil Pump (p/n HBS1220MSA-OOP460).

6. Replace 230V Overload Relay for Main Motor with 460V Overload Relay for Main Motor (HBS1220MSA-OMM460).

8.1 Removing and installing blade

A general purpose blade has been installed, tensioned, and tracked on the band saw and should not require immediate attention. For future blade replacement, proceed as follows:

1. Raise bow enough for blade to clear table slot.

2. Disconnect machine from power source.

3. Open blade wheel cover (A, Figure 8-1). Make sure rubber stop at top of bow is properly adjusted to prevent cover from falling.

4. Remove upper gap cover (B) and lower blade guard (C).

5. Release blade tension by turning blade tension handle (D) counterclockwise.

Figure 8-1: installing blade=

6. Remove blade from both wheels and out of each blade guide.

7. Make sure teeth of new blade are pointing in proper direction of travel. Work blade all the way up into blade guide bearings (E) and guide blocks (F) with back of blade against back-up bearing (G), as shown in Figure 8-2.

Figure 8-2: blade guides

NOTE: If roller bearings need adjustment refer to sect. 8.5.

8. Position blade through upper slot. Put light tension on blade and work it onto both wheels.

Make sure back of blade is against shoulder of both wheels.

9. When you are sure that back of blade is against shoulder of both wheels and properly inserted into guides, finish putting tension on blade.

10. Connect power and jog blade on/off button to be sure blade is in place and tracking properly. If blade is not tracking properly refer to sect. 8.3.

8.2 Blade tension

Blade tension has been preset by the manufacturer; if further adjustment is required, or after installing a new blade, turn handwheel (D, Figure 8-1) clockwise to appropriate tension for the installed blade.

8.3 Blade tracking

Blade tracking requires saw to be operating. Use extreme caution and keep hands away from moving blade areas.

Blade tracking has been initially set by the manufacturer. Adjustment is rarely required when blade is correctly welded and used properly. For proper blade tracking, the back of blade should be located against blade wheel shoulder. If it is not, proceed as follows.

NOTE: Do not hurry tracking adjustments. Patience and accuracy here will pay off with more accurate cutting and much longer machine and blade life.

1. Raise bow enough to allow motor to operate.

2. Loosen four knobs and open wheel cover (A, Figure 8-1). Remove upper gap cover (B, Figure 8-1), lower blade guard (C, Figure 8-1), and guide brackets (J, Figure 8-1).

3. NOTE: Maintain proper tension at all times using blade tensioning mechanism.

4. Loosen center locking screws (H in all three hex adjustment screws (H

, Figure 8-3)

Figure 8-3

While performing the

following, keep blade from rubbing excessively on wheel shoulder, which can damage wheel and/or blade.

5. Start saw blade, and slowly turn single hex adjustment screw (H

, Figure 8-13) to tilt idler

wheel. Turn screw outward so that blade starts to move away from wheel shoulder; then immediately turn screw inward so that blade stops, then moves slowly back toward shoulder.

6. Turn off saw blade.

7. Hold hex adjustment screws (H and tighten center locking screws (H

) with a wrench

). Make

sure hex adjustment screws do not move while tightening the center screws.

8. Install the two guide brackets. Position guides so that bearings just touch the blade. Refer to sect. 8.5.

9. Install upper gap cover (B, Figure 8-1) and left blade guard (C, Figure 8-1).

10. Close blade wheel cover (A, Figure 8-1) and secure with the four knobs.

8.4 Blade guide bracket adjustment

The brackets (J, Figure 8-1) should be set as close to vise jaw as possible. The right bracket has minimal adjustment and is set by the manufacturer to clear the stationary vise jaw. The left bracket can be moved to accommodate position of floating vise jaw. Loosen handle and slide bracket into position, then retighten handle.

8.5 Blade guide bearing adjustment

Proper adjustment of blade guide bearings is critical to efficient operation of the saw. The blade guide bearings have been adjusted by the manufacturer. They should rarely require adjustment except after a blade change. Failure to maintain proper blade adjustment may cause serious blade damage or inaccurate cuts.

It is always better to try a new blade when cutting performance is poor. If performance remains poor after changing the blade, make the necessary adjustments.

If a new blade does not correct the problem, check the blade guides for proper spacing. For most efficient operation and maximum accuracy, provide only very slight clearance between blade and guide bearings. The bearings will still turn freely with this clearance. If the clearance is incorrect, the blade may track off the drive wheel.

Check blade to make sure

welded section is same thickness as rest of blade. If blade is thicker at weld, the guide bearings may be damaged.

If required, adjust guide bearings as follows:

1. Disconnect machine from power source.

2. Two bearing guide assemblies are used in each set of blade guides. The inner bearing guide assembly is fixed; the outer bearing guide assembly is mounted to an eccentric shaft and is adjustable.

3. On the inner bearing guide, hold the bushing with the 19mm wrench and loosen the center locking screw with a hex wrench (see Figure 8-

4).

4. Position the bearing by turning the bushing. Set the bearing in contact with blade then back it off very slightly so that it will still turn by hand.

5. Tighten center locking screw while holding the

eccentric bushing in position with the 19mm wrench.

6. The support bearing (see G, Figure 8-2)

prevents deflection of blade under pressure from the workpiece. Set support bearing so that it nearly contacts back edge of blade but can still be turned by hand when blade is not running.

7. Use knurled knob to tighten carbide guides

against blade. Do not overtighten.

Figure 8-4

8.6 Test cutting to verify adjustment

Test cuts can be used to determine whether or not you have adjusted the blade accurately. Use 2-inch round bar stock to perform these test cuts, as follows:

1. With bar stock securely clamped in the vise, make a cut through the bar stock (see Figure 8-

5).

2. Mark the top of the bar stock.

3. Move the bar stock about 1/4-inch past the blade so that you can begin a second cut.

4. Rotate the bar stock 180 degrees so the mark you made is now at the bottom of the cut.

5. Make a cut through the bar stock.

6. Use a micrometer to measure the thickness variation of the disk you have cut from the bar stock. Measure at top and bottom of disk.

The saw blade can be considered correctly adjusted when the variation measure is no more than 0.012 inch across the face of the disk.

If you do not have a piece of 2-inch bar stock available for a test cut, use a larger diameter test piece rather than a smaller one. The maximum thickness variation on any test piece should be no more than 0.003 inch, per side, per inch of stock diameter.

8.8 Broken blade safety device

If blade breaks during operation, the limit switch shown in Figure 8-7 will automatically stop the machine.

Figure 8-7

Figure 8-5

8.7 Changing blade speed

1. Raise blade approximately six inches above workpiece and turn feed rate knob to zero.

2. Turn power on, and turn speed adjuster knob (Figure 8-6) to match appropriate material. Turn counterclockwise to increase speed, clockwise to decrease.

Turn speed adjuster knob

only when blade is running.

8.9 Vise adjustments

8.9.1 General movements

1. Place workpiece between vise jaws with required amount to be cut-off extending out past blade. (Figure 8-9 shows recommended positioning of various workpiece shapes within the vise.)

2. Lift rack block (K, Figure 7-8) and manually slide floating vise jaw in general proximity to workpiece. Let block fall to re-engage rack.

3. Model MSA: Rotate handwheel (L) to tighten jaw against workpiece

Model MSAH: Use vise button on control panel to tighten jaw.

4. To retract vise jaw, lift rack block and manually slide floating jaw away (all models), or use vise release button on control panel (model MSAH only).

Figure 8-6: blade speed adjustment

3. The indicator on the mechanism shows speeds in graduations of 90,130,170,235,370 FPM. The graduations may not match the recommended feed rate; an approximate speed may therefore be required. For example, to set a speed rate of 110 feet per minute, the indicator would be set about midway between 70 and 130 FPM.

4. Sect. 12.0 shows recommended speeds for basic materials. Refer to a machinist’s handbook for more detailed recommendations.

Figure 8-8: vise adjustments

8.9.2 Miter cuts

If making an angled cut, the fixed vise jaw remains stationary, while bow and bed are rotated (see sect.

8.12 for miter angle adjustments).

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