Cobra Electronics MAGNETIC CM/200/3 - Manual (Page 9)

RLL233 Issue 4 Aug 2007
8
Problem Cause Remedy
3) Excessive drilling
pressure required Incorrectly re-sharpened,
worn or chipped cutter
Coming down on swarf lying
on surface of work-piece
Gibs out of adjustment or
lack of lubrication
Swarf accumulated (packed)
inside cutter
Incorrect speed selection.
Re-sharpen or replace
Clean work-piece. Take care not to
start a cut on swarf
Lubricate gib and/or adjust grub
screws
Clear cutter
Select appropriate speed.
4) Excessive cutter
breakage Steel swarf or dirt under
cutter
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
Incorrect speed selection.
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 slide-way
Retighten
Fill arbor with an oil of light
viscosity and check to be sure 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
Select appropriate speed.
5) ) Excessive cutter
wear See cause and remedy above.
Incorrectly re-sharpened
cutter
Insufficient or spasmodic
cutting pressure
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