Malfunctions - Optimum Optiturn TU 2506 Operating Manual

5

Malfunctions

Malfunction
Machine does not switch on
Surface of workpiece too
rough
Workpiece becomes conical
Lathe is chattering
Center runs hot
Tool has a short edge life
Flank wear too high
Cutting edge breaks off
Cut thread is wrong
Malfunctions
Version 1.0.1 2014-05-16
Cause/
possible effects
• Order of switch-on not considered.
• Release of the FI protected switch.
• Tool blunt
• Tool springs
• Feed too high
• Radius at the tool tip too small
• Centre are not aligned (tailstock
offset)
• Top slide is not exactly set to zero
(when turning with the top slide)
• Feed too high
• Main bearings have clearance
• Workpiece has expanded
• Cutting speed to high
• Crossfeed to high
• Insufficient cooling
• Clearance angle too small (tool
"pushes")
• Tool tip not adjusted to center
height
• Wedge angle too small (heat
buildup)
• Grinding cracks due to wrong cool-
ing
• Excessive play in the spindle bear-
ings (oscillations occur)
• Tool is clamped incorrectly or has
been started grinding the wrong
way
• Wrong pitch
• Wrong diameter
Original operating instructions
OPTIMUM
M A S C H I N E N - G E R M A N Y
Solution

• "Switching on the machine" on
page 38

• "Electrical connection" on
page 106
• Resharpen tool
• Clamp tool with less overhang
• Reduce feed
• Increase radius
• Align the tailstock to the center
• Align the top slide exactly
• Reduce feed
• Have the main bearings read-
justed
• Loosen tailstock center
• Reduce cutting speed
• lower delivery ( finishing stock
allowance not over 0,5 mm)
• More coolant
• Increase clearance angle
• Correct height adjustment of the
tool
• Provide wedge angle greater
• Cool uniformly
• Have the clearance in the spindle
bearing arrangement re-adjusted.
• Setting the cutting tool to the
center, right angle grinding.
• Adjust right pitch
• Turn the workpiece to the correct
diameter
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