Replace the tools according to the following
procedure.
①Place the provided 7㎜ wrench on the spindle
shaft to fasten.
②Place the provided 5㎜ wrench on the chuck,
and turn it counterclockwise to loosen the
chuck. And pull out the tool.
③Insert another tool and turn the chuck
clockwise to fasten the tool.
5
Replace the chuck according to the following
procedure.
①Remove the tool according to the
5.
Replacement of Tools procedure above.
②Place the provided 7㎜ wrench on the spindle
shaft, and turn the top of the chuck
counterclockwise to remove the chuck.
③Attach another chuck into the spindle by
turning it clockwise.
6
7
Slit
Fastening Bolt
Fastening Bolt
Split Bushing
Bushing Split
Fastening Bolt
Trouble
Cause
Inspect/Corrective Action
Tool Slippage
Contaminants inside the chuck or the
spindle.
Chuck is not properly positioned.
Cutting tool is bent .
Ball bearing is worn out.
Use the bent tool.
Ground Particles stuck in the collet
chuck or spindle.
Ball bearing is worn out.
Clean the inside of the chuck and the
spindle.
Set the chuck properly.
Replace cutting tool.
Send to NAKANISHI for Repair.
Change the tool.
Send to NAKANISHI for Repair.
Noise or vibration during
rotation
Surface Speed (m/min)＝
3.14 × Diameter(㎜) × rotation speed(min
−１
(rpm))
1,000
Overhang(㎜)
20
25
50
Max. Operating Speed（min
−1
）
Ｎ×0.5
Ｎ×0.3
Ｎ×0.1
Table 1.Overhang and Speed
N：Max. operating speed at 13㎜ overhang.
①The proper surface speed for vitrified grindstones is 600-1800m/min.
②Do not exceed 13㎜ overhang for mounted grindstones. In case overhang must exceed 13㎜
reduce the motor speed in accordance with
!
and Table 1.
③Do not use tools with bent or broken shanks, cracks or excessive runout.
④Dress the grindstone prior to use.
⑤For grinding the maximum depth of cut should not exceed 0.01㎜ radially or axially. Reciprocate
the tool several times after each in feed step.
⑥Always operate tools within the tool manufacturer,s recommended speed limits. Use of a tool
outside of the manufacturer,s recommended speed limits could cause damage to the spindle and
injury to the operator.
⑦Keep the tool shank and collet clean. If contaminants are left in the collet ,they can cause
excessive runout and damage the tool and spindle.
⑧Do not drop or hit spindle.
8
"
When trouble is found, please check the following prior to consulting your dealer.
# $%&&&'
！
"()*+,
!
9
-
５
.１
８
７
５
Loosen
Tighten
Wrench 5㎜
Wrench ７㎜
Chuck
Tool
Spindle
Wrench ７㎜
Chuck
Loosen
７
５
.１
13
'07.08.003
①When mounting the spindle avoid the area where bearings are located. If the spindle is mounted
inappropriately, this will cause and damage to the spindle.
(Refer to the clamping area drawing in
)
②The installation shown in
is the recommended installation method.
(In case the above is impossible, install as shown in
)
When installing a spindle, it is not recommended to fix the spindle with a fastening bolt in direct
contact with the spindle body as shown in
.
This can cause deformation of the spindle body and damage internal components.
（27）
（clamping area）
