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Set Ups on the Magnetic
Chuck
Grinding Thin Workpieces
| Grinding a thin workpiece can be a challenge due to the fact that
thin workpieces tend to want to warp because of the heat that is
generated during grinding. To minimize the amount of heat generated,
mount the part at a 15-20 degree angle to the traverse direction of
the table travel (Figure 1). This reduces the amount of time that
the wheel is in contact with the workpiece. Also use a dummy block
to assure that the coolant is reacheing the part before the grinding
wheel (Figure 2). |
Figure 1. Workpiece is angled to
minimize heat build up in the part.
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Figure 2. Use a dummy block to
assure that the coolant reaches the part at the start of each pass. |
Grinding Short Workpieces
| Work that is too short to straddle at least three magnetic poles
will not be held securely enough for grinding (Figure 3). |
Figure 3. Short workpieces that do
not straddle at least three magnetic poles need to be blocked.
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| Every effort should be made to grind short work on a
fine pole magnetic chuck (Figure 4). When this is not possible,
short work must be sufficiently blocked on all sides (Figure 5) to
assure that the part will not slip during grinding. |
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Figure 4. A fine pole magnetic
chuck.
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Figure 5. A short workpiece being sufficiently blocked.
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Blocking workpieces
| The general rule of when to block a workpiece on a
magnetic chuck states: If there is more part surface area off of the
chuck then setting on the check, it needs to be blocked. The figures
below illustrate situations in grinding when blocking is needed. |
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Figure 6. A part that has roughly
three times more surface area off of the chuck than on the magnet
needs to be blocked.
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Figure 7. This piece has
non-continuous surfaces sitting on the chuck. The small legs of the
V-block provide insufficient surface area for holding the part
during a grinding operation.
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Blocking Height Good
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Blocking Too Short
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| Figure 8. When
blocking tall workpieces, make sure that the blocks are at least
half the height of the piece being blocked. Blocks that are too
short will not keep the part from toppling over when grinding. |
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