Malfunctions
Version 1.0.2 dated 2018-09-12
Page 98
Translation of the original instructions
DH55G
GB
DH
55
G_
G
B
_
8.f
m
OPTIMUM
M A S C H I N E N - G E R M A N Y
®
7
Malfunctions
Malfunction
Cause/
possible effects
Solution
Motor is hot
•
Wrong electrical connection of 400V
machines
•
Automatic feed does not work.
Spindle running will switched
off.
•
Wrong direction of spindle rotation
•
Wrong phase sequence
•
Electromagnetic clutch is damaged
•
Switch to correct spindle rotation
•
Check electrical connection
•
Replace clutch
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 surface of the drill spindle
•
Positioning the follower in the drill
spindle is not considered
•
Clean surfaces well
•
Keep surfaces free of grease
Motor does not start.
•
Motor is wrongly connected
•
Fuse is defective
•
Drill chuck guard not closed
•
Locking pin for integrated drill drift
in drift position
•
Have it checked by qualified
•
Close drill chuck guard
•
Check the position of locking pin
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
•
Check spindle return spring, replace
it, if necessary
The drilling spindle cannot be
moved downwards.
•
Integrated drill drift in drift position
•
Drill depth adjustment no released
•
Position the integrated drill drift
properly
•
Release drill depth adjustment