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11.
CAUTIONS WHEN USING GRINDSTONES
CAUTION
The maximum surface speed or rpm is always specified for a grindstone. Do not exceed
the maximum speed with reference to the calculating chart below. Always follow the
grindstone manufacturer's recommendations.
Surface Speed (m / s) =
① The proper surface speed for general grindstones is 10 - 30m / s.
② Do not exceed 13mm of overhang for mounted grindstones as shown in Fig. 8. If the overhang
must exceed 13mm, reduce the Air Turbine Spindle rotation speed in accordance with Table. 3.
③ Dress the grindstone prior to use.
④ Do not use grindstones with bent or broken shanks, cracks or excessive run-out.
⑤ For grinding, the maximum depth of cut should not exceed 0.005mm radially or axially.
Reciprocate the grindstone several times after each pass to eliminate grindstones tool pressure.
⑥ Keep the shank of the grindstone, collet and collet nut clean. If contaminants are left in the collet
or collet nut, excessive run-out will cause damage to the grindstone and or Air Turbine Spindle.
⑦ Do not strike or disassemble the Air Turbine Spindle.
⑧ Always set the grindstone to minimize the amount of overhang. 13mm is the maximum amount of
overhang to maintain high accuracy and safety.
Table. 3 Overhang and Speed
Overhang (mm)
20
25
50
*N=Max. Operating Speed with 13mm overhang.
3.14 x Diameter (mm) x Rotation Speed (min
Max. Speed (min
-1
) (rpm)
N x 0.5
N x 0.3
N x 0.1
1,000 x 60
13
Fig. 8
-1
) (rpm)
27
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