OPTIMUM
M A S C H I N E N - G E R M A N Y
Malfunctions
Version 1.0.1 2014-05-16
Page 149
Original operating instructions
TU2506 | TU2506V | TU2807 | TU2807V
GB
5
Malfunctions
Malfunction
Cause/
possible effects
Solution
Machine does not switch on
•
Order of switch-on not considered.
•
Release of the FI protected switch.
•
•
Surface of workpiece too
rough
•
Tool blunt
•
Tool springs
•
Feed too high
•
Radius at the tool tip too small
•
Resharpen tool
•
Clamp tool with less overhang
•
Reduce feed
•
Increase radius
Workpiece becomes conical
•
Centre are not aligned (tailstock
offset)
•
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 is chattering
•
Feed too high
•
Main bearings have clearance
•
Reduce feed
•
Have the main bearings read-
justed
Center runs hot
•
Workpiece has expanded
•
Loosen tailstock center
Tool has a short edge life
•
Cutting speed to high
•
Crossfeed to high
•
Insufficient cooling
•
Reduce cutting speed
•
lower delivery ( finishing stock
allowance not over 0,5 mm)
•
More coolant
Flank wear too high
•
Clearance angle too small (tool
"pushes")
•
Tool tip not adjusted to center
height
•
Increase clearance angle
•
Correct height adjustment of the
tool
Cutting edge breaks off
•
Wedge angle too small (heat
buildup)
•
Grinding cracks due to wrong cool-
ing
•
Excessive play in the spindle bear-
ings (oscillations occur)
•
Provide wedge angle greater
•
Cool uniformly
•
Have the clearance in the spindle
bearing arrangement re-adjusted.
Cut thread is wrong
•
Tool is clamped incorrectly or has
been started grinding the wrong
way
•
Wrong pitch
•
Wrong diameter
•
Setting the cutting tool to the
center, right angle grinding.
•
Adjust right pitch
•
Turn the workpiece to the correct
diameter
