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10.2 Troubleshooting procedures (1)
NATURE OF PROBLEM
BACKLASH IN OUTPUT SHAFT
Small amount along perimeter
of cam
Large amount on certain
part(s) of cam
Large amount on certain
part(s) of turret
Large amount at one place on
turret
Large amount at one place on
turret
Changes every index
PLAY IN OUTPUT SHAFT
Play in thrust direction only
Play in thrust and radial
directions
Play in thrust and radial
directions
Play in thrust and radial
directions
PLAY IN INPUT SHAFT
Play in thrust direction only
Play in thrust and radial
directions
Play in thrust and radial
directions
Play in thrust and radial
directions
NOISE
Loud noises, continuous
Loud continuous noise caused
by vibration.
Loud noises, intermittent
Loud noise, intermittent
Low noise, continuous
Low noise, intermittent
Low noise, intermittent
Low noise, Intermittent
ASSUMED CAUSE
Insufficient preload between cam
and cam follower
Cam flaking
Cam follower flaking
Crack in outer diameter of cam
follower
Damaged cam follower
Eccentric wear on outer diameter
of cam follower
Loose output flange
Worn bearings
Loose tightening nut
Creep wear on shaft
Insufficient preload on bearings
Bearing has gap in thrust direction
Worn bearings
Creep wear on shaft
Noise from lip section of oil seal
Noise from entire unit
Roughly machined cam track
surface
Rotating components touch each
other
Worn input shaft bearings
Cam flaking
Cam follower flaking
Loose rotating components
31
31
Repairs and maintenance
CORRECTION
Adjust eccentric flange on input shaft
Replace cams, reduce load on output
shaft
Replace turret, reduce load on output
shaft
Replace turret, attach torque limiter on
output shaft
Replace turret, attach torque limiter to
output shaft
Replace turret, increase oil viscosity by
one grade
Apply loctite to screw threads and
re-tighten
Check sealing device and lubrication
Tighten nut, review load in thrust
direction
Enlarge tightening length, review
ambient temperatures
Tighten flange on inside of eccentric
flange
Tighten flange on inside of eccentric
flange
Improve lubrication sealing device
Enlarge tightening length, review
ambient temperatures
Supply lubricant, replace sealing device
Check Servo Tuning section in Yaskawa
Drive manual, of contact Sankyo
America for assistance.
Correct cam, increase viscosity of
lubricating oil
Check mounted component
Replace bearings, check lubrication
Replace cams, reduce load on output
shaft
Replace turret, reduce load on output
shaft
Check tightening section of mounted
components
Unit 11
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