Gatan 656, Руководство пользователя, Страница: 38 / 49

Performance Check
28 Dimple Grinder User’s Guide
5.7 Zero Stop Adjust
This procedure should only be performed if the Dial Indicator needle zero posi-
tion is more than ± 10 µm away from the 12 o’clock position when the zero
adjustment screw is flush with its housing.
To adjust the zero stop
1. Rotate Raise/Lower Cam toward the back of the unit.
2. Turn the Micrometer Drive to the extreme clockwise position.
3. With the 3/32 hex wrench provided, screw in the zero stop screw until
flush with its housing.
4. Unscrew zero stop screw 1 1/2 turns (counter-clockwise rotation).
5. Raise the pivoted Platform.
6. Push (from below) the stylus of the Dial Indicator against the zero stop
screw, overriding the clutch.
Push with the hex wrench.
7. Screw in the zero stop screw until it is flush with its housing.
8. Screw in the zero stop screw an additional 3/4 turn clockwise, then back
to the flush position.
This will set the clutch.
9. Gently lower the Raise/Lower Cam.
10. Rotate the Micrometer Drive counter clockwise until the Dial Indicator
needle stops moving.
11. Carefully adjust the zero stop screw clockwise until the Dial Indicator
needle is at the 12 o’clock position.
At this point, the Dial Indicator and micrometer readings should correspond.
If the zero stop screw is not flush (±.15mm), some error will occur due to
the angle of the indicator arm.