Malfunctions - Optimum OPTI turn TU 3008G Operating Manual

7

Malfunctions

Malfunction
Machine does not turn on
Motor is hot
Motor has no power
Feed will stop
Surface of workpiece too rough
V-belt squeaks
V-belt slips
Speed of rotation varies too
much
Workpiece becomes conical
Lathe rattles
Centering point runs hot
Lathe tool has a short service
life
Flank wear too high
Cutting edge breaks off
GB TU3008G
104
Cause/
possible effects
• Position switch lathe chuck protec-
tion machine switches off
• Position switch protection cover
headstock machine switches off
• Emergency-stop mushroom switch
activated
• Motor protection switch has trig-
gered by overloading.
• Machine connected incorrectly
• Clutch of the longitudinal feed or
cross feed will slip.
• Lathe tool blunt
• Lathe tool springs
• Feed too high
• Radius at lathe tool tip too small
• V-belt wear down
• V-belt tension is too loose
• Centre are not aligned (tailstock off-
set)
• Top slide is not exactly set to zero
(when turning with the top slide)
• Feed too high
• Spindle bearings have too much
clearance.
• Workpiece has expanded
• Cutting speed too high
• For large infeed
• Insufficient cooling
• Clearance angle too small (lathe tool
"pushes")
• Lathe tool tip not adjusted to centre
height
• Wedge angle too small (heat buildup)
• Grinding cracks due to improper
cooling
• Excessive play in the spindle bear-
ings (oscillations occur)
Translation of original instruction
Solution
• Check position switch lathe chuck
protection, adjust
• Check or adjust the position switch of
protective cover headstock.
• Emergency-stop mushroom switch
unlock
• Avoid overloading. Activate the motor
circuit breaker again.

Resetting the motor circuit
breaker on page 29

• Electrical connection on page 24
• Cutting force too high
• If necessary, check clutch and read-

just. Clutch feed rod on page 72
• Resharpen lathe tool
• Clamp lathe tool with less overhang
• Reduce feed
• Increase radius

• V-belt check, re-tighten on page
71
• Align the tailstock to the center
• Align the top slide exactly
• Reduce feed
• Readjust spindle bearings.

Spindle bearing on page 73
• Loosen tailstock center
• Reduce cutting speed
• Lower delivery / finishing stock allow-
ance not over 0.5 mm)
• More cooling
• Increase clearance angle
• Correct height adjustment of the
lathe tool
• Set greater wedge angle
• Cool uniformly
• Have the clearance in the spindle
bearing arrangement re-adjusted

Spindle bearing on page 73
Version 1.1.6 - 2021-9-17
Malfunctions