9
3.14 x Diameter (mm) x rotation speed (min
-1
)
1,000 x 60
Surface Speed (m/s) =
12
. CAUTIONS IN 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
manufacturers recommendations.
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. 20. If the overhang must
exceed 13mm, reduce the motor speed in accordance with table 3.
③
Do not use tools with bent or broken shanks, cracks or excessive run-out.
④
Dress the grindstone prior to use.
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 tools within the allowable recommended speed of the tools. Use of a tool outside of the
allowable speed of the tools could cause damage to the spindle and injury to the operator.
⑦
Keep the tool shank and collet clean. If contaminants are left in the collet or collet nut, excessive run-out will
cause damage to the tool and or spindle.
⑧
Do not strike or disassemble the spindle.
⑨
Please set the tools to minimize the overhang amount. 13mm is the maximum amount of overhang to
maintain high accuracy and safety.
Table
2.
11
. BREAK-IN PROCEDURE
During transportation, storage or installation the grease inside the bearings will settle. If the spindle is suddenly run
at high-speed excessive heat will cause bearing damage. After installation, repair, initial operation, or long periods
of non operation please follow the break-in procedure detailed in Table 2.
Steps
1
2
3
4
Rotation speed
（
min
-
1
）
10,000
20,000
30,000
40,000
Rotation Time (min)
15
10
10
15
Items to Check
No Abnormal
Noises
The motor spindle housing temperature
during the break-in process should not
exceed 25 degrees C (36 degrees F) above
ambient temperature. Should the motor
spindle exceed this limit, rest the motor
spindle for at least 20 minutes and re-start
the break in procedure from the beginning.
If the housing temperature rises again and
exceeds 25 degrees C (36 degrees F) above
ambient temperature, check the motor
spindle for proper installation.
The motor spindle
housing temperature
during the break-in
process should not
exceed 25 degrees C
(36 degrees F) above
ambient temperature.
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