Acer Supra 818PD Operation Manual page 39

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5.4.6 GRINDING 3
Use the first and the second ground surfaces as reference, then performing grinding on
the third and the fourth side surfaces. Place the ground surface on the magnetic chuck, and
grind the adjacent surfaces for accurate squareness. Grinding procedures are shown as
below:
A.
Thoroughly clean the magnetic chuck, workpiece and angle plate.
B.
Place a sheet of clean thin paper on the magnetic chuck.
C.
Place the ground side surface of workpiece on the magnetic chuck.
a、 If the workpiece thickness is over 25mm, its length can rest on 3 polarities, then
the workpiece can be held on the magnetic chuck securely for grinding, shown as
below left figure.
b、 If the workpiece thickness is less than 25mm, its length cannot rest on 3
polarities. It requires additional support to prevent workpiece displacement
during grinding, shown as below right figure.

Place the ground side surface on the magnetic chuck.

Place an angle plate on the chuck with height lower than the workpiece. If the
angle plate is too high, place a square block or parallel strip under the workpiece,
so that the workpiece is higher than the angle plate.

Hold the workpiece against the angle plate with your hand. Increase magnetic
force by using another hand.

Use a clamp to clamp the workpiece to the angle plate. Make sure it will not
interfere against grinding operations.
D.
Grind the third side surface of workpiece until your desired size is obtained.
E.
Repeat steps A~D for grinding the fourth surface.
The workpiece is held on the magnetic
chuck for grinding the end surfaces
(3, 4)
RD TH
AND 4 SIDE SURFACES
圖
5-11
A thin small workpiece is clamped by
the angle plate for grinding the end
surfaces (3, 4)
818~2040 PD