7
Fig. 13
Hexagon Socket Head Cap Screw
(M4 x 16)
Fastening Bolt
Bushing with Slit
Split Type Holder
Fastening Bolt
Slit of Bushing
Fastening Bolt
Slit
Fig. 14
Steps
1
2
3
4
5
Rotation Speed (min
-1
) (rpm)
15,000
30,000
40,000
50,000
60,000
Rotation Time
（
min
）
15
10
10
10
15
Items to Check
No Abnormal
Noises.
The motor spindle housing temperature during the
break-in process should not exceed 20 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 20 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.
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, the grease will be ejected from the bearings, causing excessive heat that 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.
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. 15. If the overhang must exceed
13mm, reduce the motor speed in accordance with Table 3.
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.
3.14 x Diameter (mm) x rotation speed (min
-1
) (rpm)
1,000 x 60
Surface Speed (m /s)
=
12
. 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.
