Mounting Of Cutters; Remedies For Hole Making Problems - Rotabroach CM/705/1A Manual

Issue 2 July 2012

5) MOUNTING OF CUTTERS

CAUTION: Never use a cutting tool that is larger than the maximum rated capacity of the 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
socket screws RD4066.

Take appropriate pilot and place through the hole in cutter shank. Insert shank of cutter into bore of arbor, ensuring alignment of
two drive flats with socket screws.

Tighten both screws using hexagon key.
LED Work Light

6) REMEDIES FOR HOLE MAKING PROBLEMS

Problem
1) Magnetic base Material being cut may be too thin for efficient
won't hold holding.
effectively
Swarf or dirt under magnet.
Irregularity on magnet contact or work-piece.
Insufficient current going to magnet during drilling
cycles.
2) Cutter skips Magnetic base is not holding effectively.
out of centre-
punch mark at Worn arbor bushing and/or ejector collar.
initiation of cut
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 Steel swarf or dirt under cutter.
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.
Cause
9
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