30
The maximum surface speed or rpm is always speci
¿
ed 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)=
13
. CAUTIONS WHEN USING GRINDSTONES AND TOOLS
3.14 x Diameter (mm) x Rotation Speed (min
-1
) (rpm)
1,000 x 60
CAUTION
12
. BREAK-IN PROCEDURE
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
10
Items to Check
No Abnormal
Noises.
The Spindle housing temperature during
the break-in process should not exceed
20 degrees C (36 degrees F) above
ambient temperature. Should the Spindle
exceed this limit, rest the 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
Spindle and motor for proper installation.
The Spindle
housing
temperature
during the
break-in
process should
not exceed
20 degrees C
(36 degrees F)
above ambient
temperature.
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.
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. 18. 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.
