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13) SOLUTIONS FOR HOLE MAKING PROBLEMS
Problem
1) Magnetic
1. Material being cut may be too
base won't
hold
2. Swarf or dirt under magnet.
effectively
3. Irregularity on magnet contact or
4. Insufficient current going to
2) Cutter skips
1. Magnetic base is not holding
out of centre-
punch mark
2. Worn arbor bushing and/or
at initiation of
cut
3. Too much feed pressure at start
4. Cutter is dull, worn, chipped or
5. Poor centre-punch mark; weak
6. Worn or bent pilot, worn pilot
7. Loose bolts on motor bushing
3) Excessive
1. Incorrectly re-sharpened, worn or
drilling
pressure
2. Coming down on swarf lying on
required
3. Gib strips out of adjustment or
4. Swarf accumulated (packed)
Cause
thin for efficient holding.
workpiece.
magnet during drilling cycles.
effectively.
ejector collar.
of cut.
incorrectly sharpened.
pilot spring; pilot not centred in
centre-punch mark.
hole.
support bracket, main casting or
loose gib adjusting set screws.
chipped cutter.
surface of workpiece.
lack of lubrication.
inside cutter.
1. Attach an additional piece of metal under
the magnet, or mechanically clamp
magnetic base to work-piece.
2. Clean magnet.
3. Use extreme care; file any imperfections
flush to surface.
4. Confirm power supply and output from
control unit, check supply cable.
1. See causes and remedies above.
2. New arbor bushing is needed.
3. Light pressure only is needed until a groove
is cut. The groove then serves as a
stabilizer.
4. Replace or re-sharpen. Sharpening service is
available.
5. Improve centre-punch and/or replace worn
parts
6. Replace part or parts
7. Adjust where necessary
1. Re-sharpen or replace.
2. Take care not to start a cut on swarf.
3. Adjust setscrews and lubricate.
4. Clear cutter.
15
Remedy
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