Malfunctions
Version 1.0.2 - 2020-07-06
65
Translation of original instruction
DH 40CT | DH 40CTP
EN
D
H
4
0
CT_DH40CTP_G
B_6
.f
m
7
Malfunctions
Malfunction
Cause/
possible effects
Solution
Noise during work.
•
Spindle runs dry.
•
Tool blunt or incorrectly clamped.
•
Grease spindle
•
Use new tool and check tension
(fixed setting of the bit, drill chuck
and taper mandril)
Bit „burnt“
•
Incorrect speed
•
Chips are not coming out of the
drilled hole.
•
Blunt drill bit.
•
Operating without cooling agent.
•
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.
Drill point runs off, drilled hole
is not circular.
•
Hard material or length of the cutting
spirals/or angles on the tool are une-
qual
•
Drill bit is bent.
•
Use a new drill bit.
Drill bit defective.
•
No base / support used.
•
Place a piece of wood underneath
the workpiece and fasten this to the
workpiece.
Drill is running non-round or
shaking
•
Drill bit is bent.
•
Bearings worn down in the spindle
head.
•
Drill is not correctly clamped.
•
Drill chuck defective
•
Replace drill bit
•
Have the bearings in the spindle
head replaced.
•
Clamp the drill bit properly.
•
Replace the drill bit chuck.
The drill chuck or the taper
mandrel cannot be inserted.
•
Dirt, grease or oil on the taper inside
of the drill chuck or on the taper sur-
face of the drill spindle
•
Clean surfaces well.
•
Keep surfaces free from grease.
Motor does not start.
•
Motor is wrongly connected.
•
Defective fuse.
•
Have it checked by qualified person-
nel.
Motor is overheating and there
is no power.
•
Motor overloaded?
•
Too low mains voltage
•
Motor is wrongly connected.
•
Reduce feed, disconnect if necessary
and have it checked by authorised
personnel.
•
Have it checked by authorised per-
sonnel.
Precision of the work deficient.
•
Heavy and unbalanced or deformed
work-piece.
•
Inexact horizontal position of the
work-piece holder.
•
Balance the piece statically and
secure without straining
•
Adjust workpiece-holder
Spindle bearing overheating.
•
Bearing worn down
•
Bearing pretension is too high
•
Working at high speeds for a long
time.
•
Replacing
•
Increase bearing clearance for fixed
bearing (taper roller bearing)
•
Reduce feed
