Optimum OptiGrind GH 10T, Operating Manual, Page: 59 / 74

Malfunctions
Version 1.0.9 dated 2019-05-13 Page 59 Translation of the original instructions
GH 10T | GH 15T GB
GH10T_G
H15T_G
B_4-
1.f
m
OPTIMUM
M A S C H I N E N - G E R M A N Y
®
5 Malfunctions
Malfunction Cause/possible effects Solution
Motor does not turn on • Micro fuse 1F1 defective at the freezer
plug connection.

"Schaltplan - Wir-
ing diagram GH10T , GH15T“ on page
71
• Cover item 51 not completely closed,
micro switch item 24 is not pressed.
• Carbon brushes item 49 worn
• Motor defective
• 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
• Replace motor
Drills become eccentric, tips
no longer true.
Drills cannot be centred; after
sharpening, the tip is not cen-
tred.
Incorrect drill grinding, geome-
try not true.
No back cut on the drill; the
drill does not cut after regrind-
ing.
Drills are not back cut.
Appliance is grinding the drills
wrongly, clearance angle
incorrect.
• 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.
• 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.
Clamping head group cannot
be placed in its housing, or
only with difficulty. • New appliance, new parts, as yet no
wear on the surfaces.
• Surfaces covered with grinding dust.
• 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.
The wear of the steel disk,
coated with cubic crystalline
boron nitride is too great. • Regrinding of spiral drills with hard
metal tips (hammer drills). The life of
the grinding disk with HSS spiral drills
is much higher. • Use of an SDC grinding wheel, see
spare parts