Remedies For Hole Making Problems - Rotabroach Element 75 Original Instructions Manual

Element 75 Manual

14) 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 drilling Incorrectly re-sharpened, worn or chipped cutter.
pressure required
Coming down on swarf lying on surface of work-piece.
Gib strips 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 needs adjustment.
Cutter not attached tightly to arbor.
Insufficient use of cutting oil or unsuitable type of oil.
Incorrect speed
5) Excessive cutter wear See cause and remedy above
Incorrectly re-sharpened cutter.
Insufficient or spasmodic cutting pressure.
Original Instructions
Cause
12
Aug 2016
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 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.
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 grub screws supporting the slide.
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 gear is used 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.