946001 3130 Hor Band Saw.pmd | Maintenance
1. Disconnect the saw from its electric power source.
2. Lift the saw arm to its full up position and lock it up using the hydraulic feed control knob.
Note: Use the handle on the arm to lift the arm.
Never use any other part of the arm as a lifting method.
3. Remove the blade guard cover thumb screw and open the cover.
4. Loosen the blade tension knob until the blade comes off of its wheels.
5. Using leather gloves to protect from cuts, slip the blade out of the blade guide bearings and off of the saw.
6. Examine the drive and idler wheels for evidence of wear on the flanges. If the flanges are wearing, the blade is misadjusted. See Blade tracking for correcting this condition.
7. Put a replacement blade in the blade guide bearings and loop the ends of the blade over the drive and idler wheels.
Note: The saw blade teeth must point in the direction of travel. See Figure 10.
8. Use the blade tension knob to put tension on the blade until it no longer slips on the wheels.
Note: Do not overtighten the blade. Just increase tension until the blade does not slip on the wheels.
9. Close the blade guard cover and replace and tighten the thumb screw.
10. Reconnect the saw to its electrical power source.
Figure 10: Corrrect tooth direction when replacing blade.
Adjusting blade guides
Refer to Figure 1.
Both the left and right blade guides should be positioned as close as possible to the left and right edges of any work piece being cut. This provides support to the blade so it can make a straight cut.
1. Loosen the blade guide knobs.
2. Slide the blade guides to the correct spacing.
3. Tighten the lock knobs securely.
Note: The following maintenance operation requires the services of a licensed electrician.
1. Perform steps 2 through 5 in Changing blade
speeds, page 8.
2. Remove the drive belt.
3. Remove the set screw which retains the motor drive pulley to the motor shaft.
4. Pull the pulley off of the motor drive shaft.
5. BEING CERTAIN THAT THE SAW HAS BEEN
SAFELY DISCONNECTED FROM THE SERVICE
BRANCH, open the motor terminal cover and remove the three wires which connect it to the power cable.
6. Remove the four nuts, bolts and washers which hold the motor to its mounting plate.
7. Remove the motor from the saw.
8. Reinstall the replacement motor and pulley by reversing steps 7 through 4, above.
9. Loosen the the motor mounting plate adjustment screw so the screw puts no tension on the plate.
10. Adjust the position of the motor so --
A. the pulleys are parallel with each
B. the drive belt can just be installed over
the pulleys (It may be necessary to
adjust the drive pulley along the motor
shaft to make the pulleys parallel.)
11. Tighten the motor mounting bolts securely.
12. Tighten the pulley set screw securely.
13. Install the drive belt.
14. Tension the drive belt and complete the replacement task by performing instructions 6 through
9 in Changing blade speeds.
Adjusting guide bearings
The outside guide bearing on each of the bearing seats is mounted on an eccentric shaft to allow adjustment of the bearing clearance between bearings and blade, as follows:
1. Loosen the guide bearing shaft lock nut.
2. Use an open end wrench on the hex flats underneath the guide seat to adjust the eccentric shaft so the bearing holds the blade vertically against its opposing bearing. Overtightening the blade between the bearings will only shorten bearing life.
Adjust the bearings so the blade is just held firmly in a vertical position.
3. While holding the shaft from turning, tighten the lock nut on the upper side of the bearing seat.
Wheel, guide or back-up bearings
Drive and idler wheels
Hydraulic cylinder assembly
Inspect for leakage
Wipe on lubricant
Inspect and replace when glazed or worn
Inspect for leakage -repair if leaking
Inspect flange and blade surfaces
Clean control rod with a clean rag
Gearbox and lead screw lubrication
Lubricate the vise lead screw and gearbox with
Shell Valvata Oil No. J-78 or Macoma 72 or its equivalent.
The gearbox gears run in an oil bath and will not require lubricant change more than once a year unless the lubricant is accidentally contaminated or leakage occurs due to improper replacement of the gearbox cover or gasket. During the first few days of operation the drive gears will run hot. Unless the temperature exceeds 200 degrees F., there is no cause for concern.
1. If the blade is fully tensioned, release tension slightly while performing the tracking operation.
2. If the blade is not on slow speed, change to the slowest speed according to instructions in
Changing blade speeds.
3. Lift the saw arm to its full up position and lock it using the hydraulic feed control knob.
Note: Use the handle on the arm to lift the arm. Never use any other part of the arm as a lifting method.
4. Remove the thumb screw and open the blade guard cover. Prop it open so you can have access to the idler wheel.
5. Refer to Figure 11. Use a wrench to loosen bolt A, a small amount.
6. Turn the saw motor ON.
7. Insert a hex wrench into the set screw, B, and turn it slightly while observing the tracking action of the blade on the idler wheel. Turning the hex wrench clockwise will make the blade track toward the wheel flange. Turning the
When changing blade speeds
All bearings are sealed -- any
leaking bearing must be
Gear oil* (see note, below)
Annually Gear oil*(see note, below)
When changing Replace wheels if flanges blades
Dirt on the control rod can
damage the seal and cause
leakage -- resulting in
replacement of the cylinder
assembly, complete wrench counterclockwise will make the blade track away from the flange.
8. Adjust the set screw in very small amounts until the blade just starts to track toward the flange.
9. As you adjust the blade toward the flange, insert a strip of paper between the blade and wheel as shown in
Figure 12 at the top of the next page.
CAUTION: Use a strip of paper six inches long or longer so your hands stay clear of the moving parts of the saw.
10. Keep using small amounts of adjustment to move the blade toward the flange... testing with the paper strips... until the paper is cut between the blade and flange.
11. When the paper is cut, turn the hex wrench slightly in the opposite direction so the blade does not track while touching the flange.
12. Tighten bolt A.
13. Check with a paper strip to be certain the blade has not moved back into contact with the flange.
Readjust, if necessary.
14. Using the blade tension knob, reapply tension to the blade so it does not slip on the wheels.
15. Turn the saw OFF.
16. Close the blade guard cover and install and tighten the thumb screw.
Figure 11: Blade tracking mechanism
Figure 12: Checking blade tracking
Replacing guide bearings
1. Remove the blade according to instructions 1 through 5 in Changing blades,
2. Remove the snap ring which holds the bearing to the shaft.
3. Press off the bearing.
4. Press on the new bearing and secure it with the snap ring.
5. Reinstall the blade according to instructions 6 through 10 in Changing blades.
6. Adjust the bearing spacing according to instructions in Adjusting guide bearings.
Adjusting back-up bearings
Refer to Figure 13.
1. Disconnect the saw from its electrical power source.
2. Loosen the guide bearing seat retaining bolt.
3. Slide the bearing seat as necessary until the back-up bearing just touches the back edge of the saw blade.
4. Tighten the guide bearing seat retaining bolt.
5. Restore electrical power to the saw.
Figure 13: Adjusting back-up bearings
Adjusting the arm stop adjustment bolt
Refer to Figure 1.
1. Lower the arm to its fully lowered position. The saw blade should be level and the cutting edge of the blade should be in the relief slot, below the level surface of the saw base. If this is not the case, adjust the arm height as follows:
2. Loosen the leveling bolt lock nut.
3. Adjust the leveling bolt until it supports the arm and blade correctly as described above -- level and below the top of the saw base.
4. Tighten the leveling bolt lock nut.
Adjusting motor switch actuator
This task should be performed whenever the arm stop adjustment is corrected or whenever the saw is turning off incorrectly.
Refer to Figure 1.
1. Raise the arm until the switch actuator is not in contact with the switch.
2. Turn the switch ON.
3. Open the hydraulic control valve so the arm moves slowly downward.
4. The motor switch should shut off just as the arm contacts its horizontal stop bolt and the blade is fully below the blade relief in the saw base. If the motor shuts off too soon, or not at all, adjust the switch actuator by bending it, as required, to correct the fault condition.
Replacing a back up bearing
1. Remove the blade according to instructions 1 through 5 in Changing blades.
2. Remove the guide bearing assembly from the
14 saw arm by removing the guide lock knob and sliding the assembly from the arm.
3. Use a drift to knock out the pin until until the bearing can be removed.
4. Replace the bearing and press the shaft back into the seat.
5. Reinstall the bearing assembly in the arm.
6. Reinstall the blade according to instructions 6 through 9 in Changing blades.
7. Adjust the back up bearing spacing according to instructions in Adjusting back up bearing clearance.
Adjusting the bearing guide seats for blade vertical
1. Install a new blade according to instructions in
2. Adjust the guide bearings according to instructions in Adjusting guide bearings.
3. Adjust the back-up bearing according to instructions in Adjusting back-up bearings.
4. With the arm in its full horizontal position and the blade guides moved apart to clear the widest possible cutting area, clip a scale to the blade, to provide a vertical reference surface.
5. Place a machinist's square on the saw base, against the scale. See Figure 14.
6. Loosen the guide bearing seat attachment bolt slightly and, using a wrench on the bearing seat, adjust the angle of the seat so the blade is vertical.
(There is a small amount of side relief between the seat and guide bar to allow for this adjustment.)
7. Tighten the seat attachment bolt.
8. Move the scale and square to the other side of the exposed blade and repeat steps 4, 5, 6 and 7, above.
Test cutting to verify adjustment accuracy
Test cuts can be used to determine whether or not you have adjusted the blade accurately. Use 2 inch bar stock to perform these test cuts, as follows:
1. With the bar stock securely clamped in the vise, make a cut through the bar stock. (See Figure 15.)
2. Mark the top of the bar stock.
3. Move the bar stock about 1/4 inch past the blade so 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 between the top and bottom of the disc you have cut from the bar stock. Unless things are truly perfectly aligned, there is almost certain to be a certain amount of "wedge" to the shape of the disc you have cut. The saw blade can be considered correctly adjusted when the variation measured is no more than .012 inch across the face of the disc.
If you do not have a 2 inch bar stock available for a test cut, use a larger diameter test work piece rather than a smaller one. The maximum thickness variation on any test piece should be no more than
.003 inches, per side, per inch of stock diameter.
Figure 14: Adjusting the saw blade for vertical. Be sure to do this operation on both of the bearing guide seats so the blade is perfectly vertical along its entire exposed cutting surface.
Figure 15: Step-by-step method to produce a test disc which can be measured for "wedge" - a measurement for testing cutting accuracy.
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