Champion Roto Brute BD100 MEGABRUTE Operating Manual page 8

REMEDIES FOR HOLE MAKING PROBLEMS
PROBLEM
1) Magnetic base will not
hold effectively
2) Cutter skips out of center-punch
mark at initiation of cut
3) Excessive drilling pressure
required
4) Excessive cutter breakage
5) Excessive cutter wear
BD100 Manual
MEGABRUTE
CAUSE
Material being cut may be too thin for
efficient holding.
Chips 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. Light pressure only is needed until a
Cutter is dull, worn, chipped or
incorrectly sharpened.
Poor center-punch mark; weak
pilot spring; pilot not centerd in
centre-punch mark.
Worn or bent pilot, worn pilot hole.
Incorrectly re-sharpened, worn or
chipped cutter.
Coming down on chips lying on
surface of workpiece.
Chips accumulated (packed) inside
cutter.
Steel chips or dirt under cutter.
Incorrectly re-sharpened or worn
cutter.
Cutter skipping.
Cutter not attached tightly to arbor.
Insufficient use of cutting oil or
unsuitable type of oil.
Incorrect speed
See cause and remedy above
Incorrectly re-sharpened cutter.
Insufficient or spasmodic cutting
pressure.
8
REMEDY
Attach an additional piece of metal
under the magnet, or mechanically
clamp magnetic base to workpiece.
Clean magnet.
Use extreme care; file any
imperfections flush to surface.
Confirm power supply and output from
control unit, check supply cable.
See causes and remedies above.
New arbor bushing is needed.
groove is cut. The groove then serves
as a stabilizer.
Replace or re-sharpen. Sharpening
service is available.
Improve center-punch and/or replace
worn parts Worn or bent pilot, worn
pilot hole.
Replace part or parts
Re-sharpen or replace.
Take care not to start a cut on chips.
Clear cutter.
Remove cutter, clean part thoroughly
and replace.
Always have a new cutter on hand
to refer to for correct tooth geometry,
together with instruction sheet.
See causes and remedies (2).
Retighten.
Inject oil of light viscosity into the
coolant-inducing ring and check that
oil is being metered into cutter when
pilot is depressed. If not, check pilot
groove and arbor internally for dirt
or apply oil externally. (Even a small
amount of oil is very effective).
Ensure correct speed is use for the
cutter.
Refer to instructions and a new cutter
for proper tooth geometry.
Use sufficient steady pressure to
slow the drill down. This will result in
optimum cutting speed and chip load.
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