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7
Malfunctions
Malfunction
Motor is hot
Noise during work.
Bit „burnt"
Drill tip is running off centre,
the drilled hole is non-round
Drill is defective
Drill is running non-round or
shaking
It is not possible to insert the
drill chuck or the taper
mandrel
Motor does not start
Motor is overheating and
there is no power
Precision of the work deficient
Drilling spindle sleeve does
not return to its initial position
Malfunctions
Version 1.2.9 - 2021-09-28
Cause/
possible effects
•
Wrong electrical connection of 400
V machines
•
Spindle is too little lubricated
•
Tool is blunt or wrongly clamped
•
Gear is too little lubricated
•
Drill speed too high /feed too high
•
Chips do not come out of the drill
hole.
•
Drill blunt
•
No or too little cooling
•
Hard points on the workpiece
•
Length of the cutting spirals/or
angles on the tool are unequal
•
Drill deformed
•
No base / support used.
•
Drill deformed
•
Worn out spindle bearings
•
Drill is not correctly clamped.
•
Drill chuck defective
•
Dirt, grease or oil on the taper
inside of the drill chuck or on the
taper surface of the drill spindle
•
Positioning the follower in the drill
spindle is not considered
•
Motor is wrongly connected
•
Defective fuse
•
Drill chuck protection not closed
•
Motor overloaded
•
Too low mains voltage
•
Motor is wrongly connected
•
Irregularly heavy or tensed work-
piece
•
Inexact horizontal position of the
work-piece holder
•
Spindle return spring does not work
Translation of original instruction
Solution
•
Power supply on page 94
•
Lubricate spindle (only possible
when disassembled)
•
Use new tool and check tension
(fixed setting of the bit, drill chuck
and taper mandril)
•
Lubricate gear
„Img.6-5: Gear
opening DH 26 GT, DH 28 GS" on
page 122
•
Select another speed
•
Extract drill more often during work
•
Sharpen or
use new drill
•
Use cooling agent
•
Use new drill
•
Use support and clamp it with the
workpiece
•
Use new drill
•
Have the spindle bearings replaced
•
Correctly clamp drill
•
Replace the drill chuck
•
Clean surfaces well
•
Keep surfaces free of grease
„Img.4-7: Quick-action drill
chuck" on page 102
•
Have it checked by authorised per-
sonnel
•
Close drill chuck protection
•
Reduce feed rate
Disconnect immediately and have it
checked by authorized personnel
•
Have it checked by authorised per-
sonnel
•
Balance the piece statically and
secure without straining
•
Adjust workpiece-holder
•
Check spindle return spring, replace
it, if necessary
DH26GT | DH28GS | DH32GS
EN
127
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