43
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
Check oil level, viscosity and date of last
change of lubricating oil
Adjust backlash amount to appropriate value
→
Inappropriate backlash amount
Chips accumulate in rotary part of NC rotary
table
Remove
accumulated
chips
in
daily
inspection
Symptom
⑤:
Table is not clamped or unclamped
Possible causes
Corrective actions
Faulty solenoid valve
Replace the solenoid valve
Faulty clamp/unclamp confirming device
(pressure switch)
Check and replace the clamp/unclamp
confirming device (pressure switch)
Damage or connection failure of working
fluid pipe for clamp
Check the piping for connection, and replace
Supply pressure of working fluid for clamp is
lower than specified value
Change to appropriate value according to
the specification
Back pressure acts to the air pressure
exhaust port of solenoid valve, as the air
purge port in the motor case is blocked.
Remove the cause that blocks the air purge
port.
Faulty clamp device
Stop the use of NC rotary table immediately.
Please contact the sales agent.
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.