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13
Maintenance procedures
Removing and replacing
grinding discs
Figure 12: Replacing a grinding disc
Figure 13: Replacing a grinding disc
CAUTION: The gap between the abrasive surface and table
edge must not exceed 3/16". If it does, loosen the four motor
mount bolts and move the motor forward to minimize gap.
Grinding discs are secured to the aluminum drive
disc using an adhesive on the grinding disc backing. To
remove an abrasive disc:
1. Turn the ON/OFF switch OFF.
2. Disconnect the machine from its power source to
prevent accidental start-up of the motor.
3. Move the table to the bottom of its travel using the
table raiser mechanism. (See Raising and lowering the
table, page 8.)
4. Tilt the disc guard to the rear to expose the top of the
drive disc.
5. Pull at the edge of the mounted grindng disc to pull it
away from the drive disc, then pull it completely off of the
drive disc.
6. Be certain the drive disc surface is clean. If neces-
sary, use a cleaner which dries film-free (such as
naptha) to remove any old adhesive (or dust) which might
adhere to the drive disc.
7. Remove a small portion of the protective cover from
the back side of the new grinding disc you are mounting
on the drive disc. A typical amount to remove is about a
third of the protective cover. See Figure 8.
8. Put the exposed edge of the new grinding disc against
the drive disc and center the grinding disc carefully on the
drive disc. When you are certain it is accurately centered,
press on grinding disc so the exposed portion of the
adhesive anchors the grinding disc to the drive disc.
9. Rotate the drive disc 180 degrees. See Figure 13. The
part of the grinding disc which is attached to the drive disc
will now be at the bottom of the drive disc, and will be slightly
hidden behind the table.
With the components in this position you can keep the
grinding disc accurately centered while reaching be-
tween the grinding disc to remove the rest of the protec-
tive backing and progressively pressing the grinding disc
against the face of the drive disc. The reason for this
care is that a grinding disc, once firmly pressed into
position, is often extremely difficult to remove. In other
words: Once it is down... it is down to stay.
10. Press firmly against the full surface of the disc. The
idea here is to be sure the grinding disc makes full
contact with the drive disc and is laying absolutely flat on
the disc surface.
11. Move the wheel guard forward so it covers the edge of
the grinding and and drive disc.
12. Adjust the table height to working height.
13. Reconnect power to the machine.
14. Turn the machine "ON" and observe the action of the
disc for possible unbalance. When you are certain all
systems are operating correctly, grinding operations may
resume.
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