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RLL233 Issue 4 Aug 2007
7
[7] REMEDIES FOR HOLE MAKING PROBLEMS
Problem
Cause
Remedy
1) Magnetic base
won't hold effectively
Material being cut may be too
thin for efficient holding of
magnet
Swarf or dirt under magnet
Irregularity on magnet face or
work-piece
Insufficient current going to
magnet during drilling cycle
Attach an additional piece of metal
under work-piece where magnet will
be located, or mechanically clamp
magnetic base to work-piece
Clean magnet
Use extreme care, file only
imperfections flush to surface
Confirm power supply and output
from control unit.
2) Cutter skips out of
centre-punch mark at
initiation of cut
Magnetic base is not holding
effectively
Worn arbor bearing and/or
ejector sleeve
Too much feed pressure at
start of cut
Cutter is worn, chipped or
incorrectly sharpened
Poor centre-punch mark;
weak pilot spring; pilot not
centred in centre-punch mark
Worn or bent pilot, worn pilot
hole
Loose bolts on arbor bearing
support bracket or loose gib
adjusting set screws
See causes and remedies above
Replace! Only a few thousandths
wear permissible.
Light pressure until a groove is cut.
The groove then serves as a
stabilizer.
Replace or re-sharpen. Sharpening
service is available.
Improve centre-punch and/or replace
worn parts
Replace part or parts
Adjust where necessary