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14.
CAUTIONS WHEN USING GRINDSTONES AND TOOLS
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. 28. If the overhang must exceed
13mm, reduce the Brushless Motor Spindle speed in accordance with Table. 4.
(3) Dress the grindstone prior to use.
(4) Do not use cutting tools with bent or broken shanks, cracks or excessive run-out.
(5) For grinding, the maximum depth of cut should not exceed 0.01mm radially or axially. Reciprocate the tool
several times after each pass to eliminate tool pressure.
(6) Always operate cutting tools within the allowable recommended speed of the cutting tools. Use of a cutting tool
outside of the allowable speed of the cutting tools could cause damage to the spindle and injury to the operator.
(7) Keep the cutting tool shank and collet clean. If contaminants are left in the collet or collet nut, excessive run-out
will cause damage to the cutting tool and or spindle.
(8) Do not strike or disassemble the Brushless Motor Spindle.
(9) Please set the cutting tools to minimize the overhang amount. 13mm is the maximum amount of overhang to
maintain high accuracy and safety.
Table. 4 Overhang and Speed
Overhang (mm)
20
25
50
* N = Max. Operating Speed with 13mm overhang.
38
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
) (rpm)
-1
13
Fig. 29
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