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5
Malfunctions
Malfunction
Motor does not turn on
Drills become eccentric, tips
no longer true.
Drills cannot be centred; after
sharpening, the tip is not
centred.
Incorrect drill grinding,
geometry not true.
No back cut on the drill; the
drill does not cut after
regrinding.
Drills are not back cut.
Appliance is grinding the drills
wrongly, clearance angle
incorrect.
Clamping head group cannot
be placed in its housing, or
only with difficulty.
The wear of the steel disk,
coated with cubic crystalline
boron nitride is too great.
EN
GH 10T | GH 15T
56
Cause/possible effects
•
Micro fuse 1F1 defective at the freezer
plug connection.
Schaltplan - Wir-
ing diagram - GH10T , GH15T on
page 70
•
Cover item 51 not completely closed,
micro switch on GH15T item 24 is not
pressed.
•
Carbon brushes item 49 worn
•
Unit not cleaned of grinding dust.
•
Motor defective
•
Incorrect operation and maintenance
of the appliance
•
Drill diameter adjusting screw not set
correctly.
•
Drill stop edge and clamping head
group stop surface neglected during
setting.
•
New appliance, new parts, as yet no
wear on the surfaces.
•
Surfaces covered with grinding dust.
•
Regrinding of spiral drills with hard
metal tips (hammer drills). The life of
the grinding disk with HSS spiral drills
is much higher.
Originalbetriebsanleitung
Solution
•
Determine the cause, where appro-
priate have this checked by a trained
specialist.
Replace micro fuse.
•
Close cover completely, check micro
switch.
•
Replace carbon brushes
•
Inspection and maintenance on
page 57
•
Replace motor
•
Turn the chuck in the housing
through 180° and grind both sides of
the drill until a grinding noise is no
longer audible.
•
Drill is not clamped correctly in the
chuck.
•
Drill is moved by contact pressure
while grinding in the chuck, because
the grinding disk is worn
•
The chuck has not been inserted
correctly in the clamping head group.
•
Set the drill diameter correctly. Con-
sider the backlash of the thread in
the adjusting screw. The smaller the
drill, the more difficult the setting.
•
Observe the required stop areas
while setting, the cutting edge of the
drill and stop area at the clamping
head group.
•
Flying sparks detectable with HSS
spiral drills? No, grinding disk is
worn and must be replaced.
•
Reduce and round the diameter of
the housing or the clamping head
group bevel with 120 grain emery
cloth.
•
Clean the surfaces, use some oil.
•
Use of an SDC grinding wheel, see
spare parts
Version 1.1.4 - 2022-09-23
Malfunctions
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