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7
Malfunctions
7.1
Milling machine malfunctions
Malfunction
Tool "burnt".
Taper cannot be inserted in
quill.
The taper cannot be pushed
out.
Motor does not start.
Rattle the spindle if the work-
piece surface is rough.
Fine feed of the spindle
sleeve does not work
Earth leakage circuit breaker
trips
Rapid traverse in Z-axis does
not work.
Version 1.0.1 dated 2017-08-10
Cause/
possible effects
•
Incorrect speed.
•
Chips are not coming out of the
drilled hole.
•
Blunt tool.
•
Operating without cooling agent.
•
Remove any dirt, grease or oil
from the internal conical surface of
the spindle sleeve or the taper.
•
Optional MT4 taper is shrinked on
the Morse taper.
•
Defective fuse.
•
Circuit breaker
•
Upcut mill machining not possible
under the current operating condi-
tions.
•
Clamping lever of the movement
axes not tightened.
•
Loose collet chuck, loose drill
chuck, mechanical security tool
clamping system not engaged.
•
Tool is blunt.
•
The workpiece is not fastened.
•
Excessive slack in bearing.
•
Spindle moves up and down.
•
Fine feed is not correctly activated.
•
Coupling of the fine feed does not
cam-in, is soiled, blurred, worn,
defective
•
Not correct type of RCCB in
MH50V
•
End position of the axis reached.
•
Motor circuit breaker of drive has
tripped.
Translation of the original instructions
OPTIMUM
M A S C H I N E N - G E R M A N Y
Solution
•
Choose a different speed, exces-
sive feed.
•
Withdraw the tool more frequently.
•
Sharpen or replace tool.
•
Use coolant.
•
Clean surfaces well.
Keep surfaces free from grease.
•
Let the machine run at highest
speed for two minutes to warm it
up and attempt to remove the
taper again.
•
Have it checked by qualified per-
sonnel.
•
Perform conventional milling.
•
Tighten the clamping lever.
•
Check, enable mechanical security
tool clamping system.
•
Sharpen or renew the tool.
•
Clamp the workpiece firmly.
•
Readjust the bearing slack or
replace the bearing.
•
Readjust the bearing slack or
replace the bearing.
•
"Spindle quill feed" on page
36
•
Clean, replace.
•
"When the ELCB triggers" on
page 31
•
Manually move the milling head
into the possible rapid traverse
travel range.
•
Do not operate the drive in contin-
uous operation (S6-60%)
MH50G│MH50V
GB
Page 67
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