Remedies For Hole Making Problems - Rotabroach Element 40 PERM Manual

REMEDIES FOR HOLE MAKIING
PROBLEMS
Problems
1) Magnetic base
won't hold
effectively
2) Cutter skips out
of centrepunch
mark at initiation
of cut
3) Excessive drilling
pressure required
Cause
Material being cut may be too thin
for efficient holding.
Swarf or dirt under magnet.
Irregularity on magnet contact or
workpiece.
Insufficient current going to magnet
during drilling cycles.
Magnetic base is not holding
effectively.
Worn arbor bushing and/or ejector
collar.
Too much feed pressure at start of
cut.
Cutter is dull, 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 motor bushing sup-
port bracket, main
casting or loose gib adjusting set
screws.
Incorrectly re-sharpened, worn or
chipped cutter.
Coming down on swarf lying on
surface of workpiece.
Gib strips out of adjustment or lack
of lubrication.
Swarf accumulated (packed) inside
cutter.
Remedy
Attach an additional piece of metal
under the magnet, or mechanically
clamp magnetic base to work-
piece.
Clean magnet.
Use extreme care; file any imperfec-
tions flush to surface.
Confirm power supply and output
from control unit, check supply
cable.
See causes and remedies above.
New arbor bushing is needed.
Light pressure only is needed 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
Re-sharpen or replace.
Take care not to start a cut on
swarf.
Adjust setscrews and lubricate.
Clear cutter.
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