Malfunctions - Optimum OPTiturn TH 3309 Betriebsanleitung

7

Malfunctions

Malfunction
Machine does not turn on
Indicator light is not lit
Indicator light is not lit
Motor hums
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
Turned threaded is wrong
Version 1.1.0 - 2020-08-06
Cause/
possible effects
• Position switch spindle brake machine
switches off
• Position switch lathe chuck protection
machine switches off
• Position switch protection cover head-
stock machine switches off
• EMERGENCY-STOP mushroom
switch activated
• Control transformer is defective
• Indicator light is defective
• Control transformer is defective
• Fuse is defective
• 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
• V-belt wear down
• V-belt tension is too loose
• 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 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 cool-
ing
• Excessive play in the spindle bearings
(oscillations occur)
• Lathe tool is clamped incorrectly or
grinding has been started the wrong
way
• Wrong pitch
• Wrong diameter
Translation of original instruction
Solution
• Check position switch spindle brake,
adjust
• Check position switch lathe chuck pro-
tection, adjust
• Check position switch protective cover
headstock adjust
• EMERGENCY-STOP mushroom
switch unlock
• Replace the transformer
• Replace indicator light
• Replace the transformer
• Replace the fuse
• Resharpen lathe tool
• Clamp lathe tool with less overhang
• Reduce feed
• Increase radius

V-belt check, re-tighten on page 131

V-belt check, re-tighten on page 131
• Align the tailstock to the center
• Align the top slide exactly
• Reduce feed
• Have the main bearings readjusted
• 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
• Have the clearance in the spindle
bearing arrangement re-adjusted
• Set the lathe tool to the centre, grind
angle correctly
Use 60° lathe tool for metric threads,
55° lathe tool for inch thread
• Adjust right pitch
• Turn the workpiece to the correct
diameter
TH3309 | TH3309D EN
135