Troubleshooting
OPTIMUM
MASCHINEN - GERMANY
21 / 07 / 2014Page 76 Troubleshooting Bench drill and upright drill B24H ; B28H (B) (Vario) ; Version 2.1.7
2014
US
8 Troubleshooting
Problem Cause / possible effects Solution
FI protective switch on
machines with frequency
converter triggers.
• an unusual FI protective switch is
being used
• „Power supply“ on page 33
Motor gets hot
• wrong power supply
Noise during working
• Spindle turning dry
• Tool blunt or is being incorrectly
secured
• Grease spindle (only in the dis-
mantled condition possible)
• Use new tool and check secu-
ring (fixed setting of the bit, drill
chuck and morse taper).
Bit „burnt“
• bit speed too high/too much feed
• The chips have not been remo-
ved from the bore hole
• Bit dull
• no or too little cooling
• Select another speed
• Extract the bit more often
• Sharpen or replace bit
• Use coolant.
Bit tip moves, bore hole
is not circular
• hard part on the work piece
• Unequal length of the cutting spi-
ral or angles in the bit.
• Bit deformed
• Replace bit
Defective bit
• No support used. • Use a wooden board and secure
it to the work piece
Bit running off-centre or
„hoping“
• Bit deformed
• spindle bearing worn out
• Bit badly secured.
• Drill chuck defective.
• Replace bit
• replace spindle bearing
• Secure the bit properly
• Replace the drill chuck
Impossible to introduce
drill chuck or morse taper
• There is dirt, grease or oil on the
inner conical surface of the drill
chuck or on the conical surface of
the drill spindle
• Clean surfaces well
• Keep surfaces fat free
Motor does not start
• motor badly connected
• Defective fuse
• Have it checked by authorized
personnel
Overheating of motor and
lack of power
• motor overloaded
• Insufficient mains voltage
• motor badly connected
• Reduce feed, disconnect if
necessary
• Have it checked by authorized
personnel
Precision of the work
deficient
• Heavy and unbalanced or twi-
sted work piece
• Balance work piece statically and
secure it without straining
• Adjust work piece holder
Drill spindle does not
return to its initial position
• Failure of spindle return spring
• Locking bolt inserted
• Check spindle return spring and
replace if necessary
• Remove locking bolt
Impossible to move the
drill spindle sleeve down-
wards.
• Locking bolt inserted
• Drill depth adjustment no
released
• Pull out the locking bolt
• Release drill depth adjustment
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