Acer Supra 2040PD, Operation Manual

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818~2040 PD
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5-5
5.2 MOUNTNG WORKPIECE
To achieve high accuracy of grinding, one of the important requirements is to mount the
workpiece correctly and stably. The correct workpiece holding methods depend on the
workpiece size, shape and material. Basically workpiece types can be classified as four types,
including flat workpiece such as plate or block, thin workpiece, short with small workpiece and
non-magnetic workpiece.
Mounting instructions for various workpieces are shown as below:
5.2.1 FLAT WORKPIECE
–
PLATE OR BLOCK
Mounting instructions for flat workpiece:
In general, this type of workpiece has enough sectional area to be hold by a magnetic
chuck, which requires no further accessory for assistance. Below gives the mounting
instructions:
1.
Remove all burrs on a parallel workpiece surfaces.
2.
Apply a fine oil stone to remove any burrs or nicks existed on the magnetic chuck surfaces.
3.
Use a clean cotton cloth to clean the chuck surface and finger marking. Also, remove any fine dirts or
powder dusts.
4.
Place a thin paper on the chuck, which size should be bigger than the workpiece.
5.
Place the workpece on the paper, and keep it placed on the insert of the chuck.
6.
If the workpiece slightly moves on the chuck surface, it is suggested to fit a thin pad under the
workpiece to avoid movement. If it is difficult to add a pad, the workpiece will be straightened when the
magnetic chuck increase magnetism. However, when the chuck demagnetized, the workpiece will
return to the wrapped condition.
7.
Shift the handle to the connect position for increasing magnetism.
8.
Try to manually move the workpiece held by the chuck to check if it is held on the chuck securely.
5.2.2 THIN WORKPIECE
A. Use of the connecting plate:
The thin workpiece is normally hold by a magnetic conductive block. As a thin workpiece may be distorted by
the powerful magnetic flux of the magnetic chuck, the fine polarity on the connecting plate may allow lots of
weak magnetic flux to enter into the workpiece. This enables the thin workpiece to be held securely for grinding.
In addition, it may reduce workpiece distortion caused by powerful magnetic flux.
B. Instruction for using connecting plate to hold workpiece:
1.
Thoroughly check burrs on the magnetic chuck surfaces, then apply an oil stone for removing burrs.
2.
Thoroughly clean the magnetic chuck surface.
3.
Select a proper magnetic conductive block that suits to the size of magnetic chuck.
4.
Clean the top and bottom surfaces of the magnetic conductive block.
5.
Place a thin paper on the center of magnetic chuck, which size should be bigger than the magnetic
conductive block.
6.
Place the paper on the magnetic conductive block, which position should be same as that of the chuck
polarity. Note that incorrect position may reduce holding capability.
7.
Place the workpiece on the magnetic conductive block, and check its leveling condition. If the
workpiece may move, place a thin paper under the workpiece. Never try to use a non-magnetic pad,
because the magnetic flux cannot enter into the workpiece.
8.
Shift the handle to the connect position for increasing magnetism.
9.
Check if the workpiece is held securely or not.