Acer Supra 818PD Operation Manual page 34

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5.2.3 THIN WITH SMALL WORKPIECE
A. Mounting thin with small workpiece:
This type of workpiece should be mounted on the magnetic conductive plate that may
prevent workpiece distortion due to powerful magnetic flux. Mounting workpiece
according to following procedures:
1. Refer to thin workpiece mounting steps from "a＂ to "g＂.
2. Place the small workpiece on the magnetic conductive plate with about 15º~30º
angle, shown as figure below. This will reduce the contact time between the
grinding wheel and the workpiece. Also, this may reduce thermal growth on the
grinding wheel at each feed to avoid workpiece distortion.
3. Shift the handle to the connect position for increasing magnetism.
4. Check if the workpiece is held securely of not.
B. MOUNTING SHORT WITH SMALL WORKPIECE:
If a short with small workpiece can't rest on three magnetic inserts of the magnetic
chuck, it may result in insufficient holding. In this case, it is necessary to place a steel
parallel strip or parallel block with thinner than the workpiece against the workpiece
side for support. It prevents workpiece from slipping during grinding.
5.2.4 NON-MAGNETIC WORKPIECE
As the non-magnetic workpiece can't be held by the magnetic flux of the magnetic chuck,
another clamping method shown as below shall be applied.
1. This type of workpiece should be clamped by the vise of a magnetic chuck or directly
fastened to the table.
2. Depending on the workpiece shape, it may be clamped on a magnetic vise or
double-side glue.
3. Workpiece can be clamped in the thin metallic parallel strip fitted on a magnetic chuck.
圖(A)
A thin workpiece is silently placed on the connecting plate.
5-6
818~2040 PD