Palmgren TU 2506, Operating Manual

Page: 94 / 98

Page 94
TU2506
ǀ
TU2807V US
9 Troubleshooting
9.1 Troubleshooting in the lathe
Problem Cause / possible effects Solution
Machine does not switch-on • Precedence of switch-on not con-
sidered.
• The position switch of the lathe-
chuck guard switches the lathe off.
• The position switch of the protec-
tive cover on the headstock
switches the lathe off.
• EMERGENCY-STOP button actu-
ated.
•
Circuit breaker on the back of
the control box tripped
.
•

"Power supply“ on page 26
• Check and adjust the position
switch of the lathe chuck guard.
• Check and adjust the position
switch of the protective cover on
the headstock.
• Release the EMERGENCY-STOP
button.
• Reset circuit breaker.
Surface of workpiece too
rough • Tool blunt
• Tool springs
• Feed too high
• Radius at the tool tip to little
• Resharpen tool
• Clamp tool with less overhang
• Reduce feed
• Increase radius
Workpiece is becoming
coned • Center are not aligned (tailstock
has offset)
• Top slide not aligned well (cutting
with the top slide)
• Adjust tailstock to the center
• Align top slide well
Lathe is chattering • Feed too high
• Main bearings have clearance
• Reduce feed
• Have the main bearing readjusted
Centre runs hot • Workpiece has expanded • Loosen tailstock tip
Tool has a short edge life • Cutting speed too high
• Crossfeed too high
• Insufficient cooling
• Reduce cutting speed
• Lower crossfeed/smooth finish
(allowance not over 0.5 mm)
• More coolant
Flank wear too high • Clearance angle too small (tool
"pushes")
• Tool tip not adjusted to centre
height
• Increase clearance angle
• Correct height adjustment of the
tool
Cutting edge breaks off • Wedge angle too small (heat build-
up)
• Grinding crack due to wrong cool-
ing
• Excessive clearance in the spin-
dle bearing arrangement (vibra-
tions)
• Increase wedge angle
• Cool uniformly
• Have the clearance in the spindle
bearing arrangement readjusted
Cut thread is wrong • Tool is clamped incorrectly or has
been started grinding the wrong
way
• Wrong pitch
• Wrong diameter
• Adjust tool to the centre - Grind
angle correctly
• Adjust the right pitch
• In a previous step, turn the work-
piece to the correct diameter