OPTIMUM
MASCHINEN - GERMANY
2012
Malfunctions
Version 1.0.1 dated 30 / 08 / 2012
Page 53
Original operating instructions
MH28V
GB
7 Malfunctions
7.1 Malfunctions on the drilling-milling machine
Malfunction
Cause/
possible consequences
Solution
The drilling-milling machine
does not start
• Start sequence not followed. • “Switching on the drilling-
milling machine“ on page 26
• Have it checked by authorised
staff.
Tool "burnt“. • Incorrect speed.
• The chips have not been removed
from the bore hole.
• Tool blunt.
• Operating without cooling agent.
• Select another speed, feed too
high.
• Retract tool more often
• Sharpen and replace tool.
• Use coolant.
Impossible to insert holding
taper into the spindle sleeve.
• Remove any dirt, grease or oil
from the internal conical surface of
the spindle sleeve or the holding
taper.
• Clean surfaces well.
Keep surfaces free of grease.
Taper cannot be squeezed
out
• Optional MT3 taper seat shrinked
on morse cone.
• Have the machine heat-up at
highest speed for about two minu-
tes and then try again to disas-
semble the taper.
Motor does not start • Defective fuse • Have it checked by authorised
staff.
Working spindle rattling on
rough workpiece surface
• Climb milling machining not pos-
sible under the current operating
conditions.
• Clamping lever of the movement
axes not tightened.
• Loose collet chuck, loose drill
chuck, loose draw-in rod.
• Tool blunt.
• Workpiece is not fixed.
• Excessive slack in bearing.
• Working spindle goes up and
down.
• Perform conventional milling.
• Tighten clamping lever
• Check, retighten.
• Sharpen or replace tool
• Secure the workpiece properly.
• Readjust bearing slack or replace
bearing.
• Readjust bearing slack or replace
bearing.
Fine feed of spindle sleeve
does not work
• Fine feed is not correctly activated
• Clutch of the fine feed does not
engage, is dirty, smeared, worn or
defective
•
“Manual spindle sleeve feed
with the fine feed“ on page 31
• Clean, replace
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