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7
Malfunctions
Malfunction
Noise during work.
Bit „burnt"
Drill point runs off, drilled hole
is not circular.
Drill bit defective.
Drill is running non-round or
shaking
The drill chuck or the taper
mandrel cannot be inserted.
Motor does not start.
Motor is overheating and there
is no power.
Precision of the work deficient.
Spindle bearing overheating
Malfunctions
Version 1.0.1 - 2021-07-06
Cause/
possible effects
•
Spindle runs dry.
•
Tool blunt or incorrectly clamped.
•
Incorrect speed
•
Chips are not coming out of the
drilled hole.
•
Blunt drill bit.
•
Operating without cooling agent.
•
Hard material or length of the cutting
spirals/or angles on the tool are une-
qual
•
Drill bit is bent.
•
No base / support used.
•
Drill bit is bent.
•
Bearings worn down in the spindle
head.
•
Drill is not correctly clamped.
•
Drill chuck defective
•
Dirt, grease or oil on the taper inside
of the drill chuck or on the taper sur-
face of the drill spindle
•
Motor is wrongly connected
•
Defective fuse.
•
Motor overloaded?
•
Too low mains voltage
•
Motor is wrongly connected
•
Heavy and unbalanced or deformed
work-piece.
•
Inexact horizontal position of the
work-piece holder.
•
Bearing worn down
•
Bearing pretension is too high
•
Working at high speeds for a long
time.
Translation of original instruction
Solution
•
Grease spindle
•
Use new tool and check tension
(fixed setting of the bit, drill chuck
and taper mandril)
•
Choose a different speed, excessive
feed.
•
Retract the drill bit from the bore hole
more often.
•
Sharpen the drill bit or insert new drill
bit.
•
Use coolant.
•
Use a new drill bit.
•
Place a piece of wood underneath
the workpiece and fasten this to the
workpiece.
•
Replace drill bit
•
Have the bearings in the spindle
head replaced.
•
Clamp the drill bit properly.
•
Replace the drill bit chuck.
•
Clean surfaces well.
•
Keep surfaces free from grease.
•
Have it checked by qualified person-
nel.
•
Reduce feed, disconnect if necessary
and have it checked by authorised
personnel.
•
Have it checked by authorised per-
sonnel.
•
Balance the piece statically and
secure without straining
•
Adjust workpiece-holder
•
Replacing
•
Increase bearing clearance for fixed
bearing (taper roller bearing)
•
Reduce feed
DH 40CT
EN
93
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