Mounting Of Cutters; Remedies For Hole Making Problems - Rotabroach SMARTPUMA1 Original Manual

Issue 5

6) MOUNTING OF CUTTERS

(See exploded view of complete machine)
The machine has been made to accept cutters having 19.05mm (3/4") dia. shanks.
The following procedure is to be used when mounting cutters.
Lay the machine on its side with feed handles uppermost, ensuring arbor is wound down to its lowest point to enable access to
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socket screws #12.5.
Take appropriate pilot and place through hole in shank of cutter. Insert shank of cutter into ¾" dia. bore of arbor, ensuring
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alignment of two drive flats with socket screws #12.5.
Tighten both screws using hexagon key RD4088.
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7) REMEDIES FOR HOLE MAKING PROBLEMS

Problem
1) Magnetic base won't Material being cut may be too thin for efficient holding.
hold effectively
Swarf or dirt under magnet.
Irregularity on magnet contact or work-piece.
Insufficient current going to magnet during drilling cycles.
2) Cutter skips out of Magnetic base is not holding effectively.
centre-punch mark at
initiation of cut 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 support bracket, main casting or loose
gib adjusting set screws.
3) Excessive Incorrectly re-sharpened, worn or chipped cutter.
drilling pressure
required Coming down on swarf lying on surface of work-piece.
Gibs out of adjustment or lack of lubrication.
Swarf accumulated (packed) inside cutter.
4) Excessive cutter Steel swarf or dirt under cutter.
breakage
Incorrectly re-sharpened or worn cutter.
Cutter skipping.
Slide-ways need adjustment.
Cutter not attached tightly to arbor.
Insufficient use of cutting oil or unsuitable type of oil.
5) Excessive cutter See cause and remedy above
wear
Incorrectly re-sharpened cutter.
Insufficient or spasmodic cutting pressure.
Original version
ALWAYS DISCONNECT MACHINE FROM POWER SOURCE.
Cause
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Remedy
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 any imperfections flush to surface.
Confirm power supply and output from control unit, check supply cable.
See causes and remedies above.
Replace! Only a few thousandths wear permissible. 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.
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).
Tighten sideway.
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).
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.
Nov 2014