Malfunctions
Version 1.1.6 - 2021-9-17
104
Translation of original instruction
TU3008G
GB
T
U
3008G
_GB
_7.
fm
7
Malfunctions
Malfunction
Cause/
possible effects
Solution
Machine does not turn on
•
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.
•
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.
Motor is hot
Motor has no power
•
Machine connected incorrectly
•
Electrical connection on page 24
Feed will stop
•
Clutch of the longitudinal feed or
cross feed will slip.
•
Cutting force too high
•
If necessary, check clutch and read-
just.
Surface of workpiece too rough
•
Lathe tool blunt
•
Lathe tool springs
•
Feed too high
•
Radius at lathe tool tip too small
•
Resharpen lathe tool
•
Clamp lathe tool with less overhang
•
Reduce feed
•
Increase radius
V-belt squeaks
V-belt slips
•
V-belt wear down
•
V-belt tension is too loose
•
V-belt check, re-tighten on page
Speed of rotation varies too
much
Workpiece becomes conical
•
Centre are not aligned (tailstock off-
set)
•
Top slide is not exactly set to zero
(when turning with the top slide)
•
Align the tailstock to the center
•
Align the top slide exactly
Lathe rattles
•
Feed too high
•
Spindle bearings have too much
clearance.
•
Reduce feed
•
Readjust spindle bearings.
Centering point runs hot
•
Workpiece has expanded
•
Loosen tailstock center
Lathe tool has a short service
life
•
Cutting speed too high
•
For large infeed
•
Insufficient cooling
•
Reduce cutting speed
•
Lower delivery / finishing stock allow-
ance not over 0.5 mm)
•
More cooling
Flank wear too high
•
Clearance angle too small (lathe tool
"pushes")
•
Lathe tool tip not adjusted to centre
height
•
Increase clearance angle
•
Correct height adjustment of the
lathe tool
Cutting edge breaks off
•
Wedge angle too small (heat buildup)
•
Grinding cracks due to improper
cooling
•
Excessive play in the spindle bear-
ings (oscillations occur)
•
Set greater wedge angle
•
Cool uniformly
•
Have the clearance in the spindle
bearing arrangement re-adjusted