TROUBLE SH OOTI N G
HOLZMANN Maschinen Austria
www.holzmann-maschinen.at
Seit e 4 2
Metalldrehmaschine / metal turning lathe ED 750 FDQ
2 0 TROUBLE SH OOTI N G
Disconnect t he m achine from t he pow er supply prior t o any check s perform ed
at t he m achine it self !
Trouble
Possible Reason
Solut ion
Surface of workpiece too
rough
Tool blunt
Resharpen tool
Tool springs
Clamp tool with less overhang
Feed too high
Reduce feed
Radius at the tool tip too small
Increase radius
Workpiece becomes co-
ned
Centers are not aligned (tail-
stock has offset)
Adjust tailstock to the center
Top slide not aligned well (cut-
ting with the top slide)
Align top slide well
Lathe is chattering
Feed too high
Reduce feet
Slack in main bearing
Adjust the main bearing
Centers runs hot
Workpiece has expanded
Loosen tailstock center
Tool has a short edge life
Cutting speed too high
Reduce cutting speed
Cross feed too high
Lower crossfeed (finishing al-
lowance should not exceed
0.5mm)
Insufficient cooling
More coolant
Flank wear too high
Clearance angle too small
Increase clearance angle
Tool tip not adjusted to center
high
Correct height adjustment of
the tool
Cutting edge breaks off
Wedge angle too small (heat
build-up)
Increase wedge angle
Grinding crack due to wrong
cooling
Cool uniformly
Excessive slack in the spindle
bearing Arrangement (vibra-
tions)
Adjust the slack in the spindle
bearing arrangement
Cut thread is wrong
Too is clamped incorrectly or has
been started grinding the wrong
way
Adjust to the center
Grind angle correctly
Wrong pitch
Adjust the right pitch
Wrong diameter
Turn the workpiece to the cor-
rect diameter
Spindle does not activate
Emergency stop switch activated
Unlock emergency stop switch
