Gatan 656, Руководство пользователя, Страница: 35 / 49

Performance Check
Dimple Grinder User’s Guide 25
4. Switch on the wheel motor; adjust the rotation speed to the lowest set-
ting.
5. Carefully lower the Platform.
6. Adjust the Micrometer Drive to obtain a reading on the Dial Indicator.
7. The reading on the Dial Indicator must change by no more than 2 µm.
Should the run-out be significantly greater than this amount, you may want to
consider replacing the bearing assembly depending upon the outcome of the
Axle/Grinding Wheel combination.
To check run-out of axle and wheel assembly
1. Clean male and female wheel bearing surfaces.
Carefully clean the wheel surfaces with lint-free tissue moistened with sol-
vent and mount one of the grinding wheels.
Caution: Do not flood the axle with solvent, as this may wash grit into the axle
bearings.
2. Place a stainless steel specimen mount into the centering ring and place
both on the Magnetic Table.
3. Set a Counterweight load of 20 g.
4. Switch on the wheel motor; adjust the rotation speed to the lowest set-
ting.
5. Carefully lower the Platform onto the specimen mount.
6. Adjust the Micrometer Drive to obtain a reading on the Dial Indicator.
7. The reading on the Dial Indicator must change by no more than 2 µm.
If the reading is greater than 2 µm, you can:
• Find the point on the wheel that produces the highest fluctuation. Mark the
wheel at this point and rotate the wheel with respect to the axle to find an
alignment which produces the minimum fluctuation (run-out).
• Check that the grinding wheel does not have a flat. If it does, the wheel must
be replaced.
• Try another grinding wheel. If this solves the problem, the female wheel
bearing surface is damaged and the wheel should be discarded.
• If the same run-out occurs with other wheels, either the male taper bearing
surface is damaged or the axle assembly is damaged or worn.