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Symptom ②： Table does not rotate but generates a noise
Possible causes Corrective actions
Motor makes a howling sound to try to
rotate
→Seizure of gears due to lack or
deterioration of lubricating oil
Stop the use of NC rotary table
immediately.
Please contact the sales agent.
Gears generate a noise
→ Faulty rotation due to damaged
gears
Stop the use of NC rotary table
immediately.
Please contact the sales agent.
Unit generates a noise at startup and
stops soon
→Faulty rotation because foreign
substances mix in the oil bath
Supply lubricating oil until foreign
substances come out of the drain port.
Symptom ③： Table does not rotate smoothly but generates a noise
Possible causes Corrective actions
Noise is generated repeatedly during
rotation
→Gears are damaged
Stop the use of NC rotary table
immediately.
Please contact the sales agent.
→Faulty rotation of gears because
foreign substances mix in the oil
bath
Open the lubricating oil drain port, and
supply lubricating oil until foreign
substances come out of the drain port.
Load due to overloading exceeds motor
output
Compare the specification of NC rotary
table with the work condition to make
improvement
Lack or deterioration of lubricating oil
blocks smooth rotation
Check oil level, viscosity and change
interval of lubricating oil
Faulty clamp device
See “Symptom ⑤”
Inappropriate backlash amount Adjust backlash amount to appropriate
value
Symptom ④： Chattering occurs during cutting
Possible causes Corrective actions
Inappropriate clamp condition of NC
rotary table or fixture
Check the clamp condition, and correct it
Excess cutting force is applied during
cutting
Adjust cutting condition to the specified
condition to change the cutting force to
appropriate value
Faulty clamp device
See “Symptom ⑤”
Faulty locking of worm spindle in the
backlash adjustment
Readjust
Fault due to damaged NC rotary table or
expired life of components
Stop the use of NC rotary table
immediately.
Please contact the sales agent.
Fault occurs only during continuous
cutting
→Lack or deterioration of lubricating
oil blocks smooth rotation
→Inappropriate backlash amount
Check oil level, viscosity and date of last
change of lubricating oil
Adjust backlash amount to appropriate
value
Chips accumulate in rotary part of NC
rotary table
Remove accumulated chips in daily
inspection
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