6
Malfunctions
Malfunction
Cause/
possible effects
Solution
Motor is hot
•
Wrong electrical connection of 400V
machines
•
"Electrical connection“ on page
Noise during work.
•
Spindle is too little lubricated
•
Tool is blunt or wrongly clamped
•
Lubricate spindle (only possible
when disassembled)
•
Use new tool and check tension
(fixed setting of the bit, drill chuck
and taper mandril)
Bit „burnt“
•
Drill speed too high /feed too high
•
Chips do not come out of the drill
hole.
•
Drill blunt
•
No or too little cooling
•
Select another speed
•
Extract drill more often during work
•
Sharpen or
use new drill
•
Use cooling agent
Drill tip is running off centre,
the drilled hole is non-round
•
Hard points on the workpiece
•
Length of the cutting spirals/or
angles on the tool are unequal
•
Drill deformed
•
Use new drill
Drill is defective
•
No base / support used.
•
Use support and clamp it with the
workpiece
Drill is running non-round or
shaking
•
Bit deformed
•
Bearing worn down
•
Drill is not correctly clamped.
•
Drill chuck defective
•
Use new drill
•
Have the spindle bearings replaced
•
Correctly clamp drill
•
Replace the drill 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 of grease
Motor does not start.
•
Motor is wrongly connected
•
Fuse is defective
•
Have it checked by qualified
Motor is overheating and there
is no power
•
Motor overloaded?
•
Too low mains voltage
•
Motor is wrongly connected
•
Reduce feed
Disconnect immediately and have it
checked by authorized personnel
•
Have it checked by qualified
Precision of the work deficient
•
Irregularly heavy or tensed work-
piece
•
Inexact horizontal position of the
work-piece holder
•
Balance the piece statically and
secure without straining
•
Adjust workpiece-holder
Drilling spindle sleeve does not
return to its initial position
•
Spindle return spring does not work
•
Locking bolt inserted
•
Check spindle return spring, replace
it, if necessary
•
Pull out locking pin
Spindle bearing overheating
•
Bearing worn down
•
Bearing pretension is too high
•
Working at high drilling speed over a
longer period of time.
•
Replacing
•
Increase bearing clearance for fixed
bearing (taper roller bearing)
•
Reduce drill speed and feed rate
30
