Malfunctions
Version 1.0.5 - 2020-12-09
129
Translation of original instructions
TX4414
GB
T
X
4414
_GB
_6.
fm
9
Malfunctions
Malfunction
Cause/
possible effects
Solution
Machine does not turn on
•
Position switch spindle brake machine
switches off
•
Position switch lathe chuck protection
switches the machine off.
•
Emergency-stop mushroom switch
activated
•
Check position switch spindle brake,
adjust
•
Check position switch lathe chuck pro-
tection, adjust
•
Unlock the emergency-stop mush-
room switch
Machine illumination does not
work
•
Control transformer is defective
•
Check machine illumination
•
Faulty control unit keypad or button
•
Replace the transformer
•
Replace machine illumination
•
Check control unit keypad and button
Motor hums
Motor is hot
Motor has no power
•
Machine connected incorrectly
•
Have it checked by qualified
Feed will stop
•
Feed force > 5000N
•
Sheared shear pin on feed shaft
•
electromagnetic clutch is not activated
•
Reduce feed force
•
Replace shear pin
•
Check activation of the clutch
Braking efficiency drive motor
has decreased
•
DC brake ineffective
•
Have it checked by qualified
•
Check the AC - DC converter in the
control cabinet and replace it if neces-
sary .
Gear positions on feed gear can
not be switched
Gear is switchable, but no feed
•
Sliding gear drive feed
•
Timing belt torn
•
Check shift pins in the feed gear
•
Check timing belt
•
Have it checked by qualified
Surface of workpiece too rough
•
Lathe tool blunt
•
Lathe tool springs
•
Feed too high
•
Radius at lathe tool tip too small
•
Resharpen lathe tool
•
Clamp lathe tool with less overhang
•
Reduce feed
•
Increase radius
Drive belt squeak,
slip.
•
Drive belt wear down
•
Tension of drive belt is too loose
•
Replacing
•
Retightening
Digital Position Indicator DP700
• http://www.newall.co.uk/support/downloads/digital_readouts/
Cooling lubricant running onto
the ground
•
Slotted screen at the outlet
•
Clean slotted screen in the chip tray
•
Note cooling lubricant dosage
Workpiece becomes conical
•
Centre are not aligned (tailstock off-
set)
•
Top slide is not exactly set to zero
(when turning with the top slide)
•
Check headstock alignment
•
Align the tailstock to the center
•
Align the top slide exactly
•
Align the headstock in horizontal plane
Lathe rattles
•
Feed too high
•
Main bearings have clearance
•
Reduce feed
•
Have the main bearings readjusted
Centering point runs hot
•
Workpiece has expanded
•
Loosen tailstock center
Lathe tool has a short service
life
•
Cutting speed too high
•
For large infeed
•
Insufficient cooling
•
Reduce cutting speed
•
Lower delivery / finishing stock allow-
ance not over 0.5 mm)
•
More cooling
