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TROUBLE SHOOTING
(1) The proper surface speed for vitrified grindstones is 600-1800m/min.
(2) Do not exceed 13mm overhang for mounted grindstones. In case overhang must exceed
13mm reduce the motor speed in accordance with Fig. 37 and Table 5.
(3) Do not use tools with bent or broken shanks, cracks or excessive runout.
(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 in feed step.
(6) Always 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.
(7) Keep the tool shank and collet clean. If contaminants are left in the collet they can cause
excessive runout and damage the tool and spindle.
(8) Do not drop or hit spindle.
CUTTING TOOL CAUTIONS
3.14 x Diameter (mm) x rotation speed min
-1
1,000
Surface Speed (m/min)=
CAUTION
Do not exceed a surface speed of 2,000m/min for grinding.
13
Overhang (mm)
Speed (min
-1
)
20
25
N x 0.3
50
N x 0.1
Table 5. Overhang and Speed
N=Max. operating speed at 13mm overhang.
Fig. 37
N x 0.5
Trouble
Cause
Power is not supplied.
Motor Cord or Connector Disconnected.
Controller Switch is set to Manual but
trying to start with an external command
signal through Input/Output Connector A.
Controller Switch is set to Auto but trying
to start with the Start Switch on the
Control Panel.
Motor Cord is connected to the wrong Motor Connector
on NE212. Emergency Stop Signal on Input/Output
Connector B is OFF (Open) NE211-OP1 Only.
Error Code Indicated.
Low Air Pressure
Motor Fixed Speed is set in the or
parameters.
Set Gear Mode except “1.0”.
Foreign Particles stuck in the collet chuck
or spindle.
Collet Nut is not properly positioned.
Ball Bearings Worn.
Foreign Particles in the ball bearings.
Ball Bearings Worn.
Tool out of Balance.
Motor Does Not Run
Motor Speed is not
displayed correctly
High Run-Out
Abnormal Vibration or
Noise during Operation
•Check the Main Power Inlet connection
on the front of the unit.
•Insert the Power Plug correctly.
•Check if the fuse is short.
Connect the Motor Cord to the connector
or check the Motor Cable.
Start with the Start Switch on the Control
Panel, or set the Controller Switch to Auto.
Start with an external command signal or
set the Controller Switch to Manual.
Check the Motor Cord connection and correct if necessary.
Check the source of the Emergency Stop Signal and correct
the problem. After correcting the problem, restart the system.
Check and correct the source of the Error
Code.
Adjust air pressure to between
0.25MPa-0.3MPa.
Check the and parameter
settings and adjust as needed.
Check the gear ratio.
Clean the inside of the collet chuck and
spindle.
Position the collet nut properly.
Send to NAKANISHI for Repair.
Send to NAKANISHI for Repair.
Change the tool.
Inspect/Corrective Action
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