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M A S C H I N E N - G E R M A N Y
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
Center runs hot
Lathe tool has a short service
life
Flank wear too high
Cutting edge breaks off
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
•
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 rate too high.
•
Spindle bearings have too much
play.
•
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)
Solution
•
Check position switch lathe chuck
protection, adjust
•
Check position switch protective
cover headstock, adjust
•
EMERGENCY-STOP mushroom
switch unlock
•
"Electrical connection" on
Página 26
•
Cutting force too high
•
If necessary, check clutch and read-
just.
"Clutch feed rod" on
Página
70
•
Resharpen lathe tool
•
Clamp lathe tool with less overhang
•
Reduce feed
•
Increase radius
•
"V-belt check, re-tighten" on
Página 69
•
Align the tailstock to the center
•
Align the top slide exactly
•
Reduce feed rate.
•
Readjust spindle bearings.
"Re-lubricate spindle" on Página
71
•
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
•
Readjust the play in the spindle bear-
ing.
"Re-lubricate spindle" on
Página 71
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