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CUTTERMASTER Professional CM-01P User’s Manual
Page 12
suchasa12V9or1A1toproducetheclearanceprole(gash)ontheend.
If the cutter has been too badly abused you will not be able to bring it to a satisfactory state by
re-grinding. Overuse or allowing a cutter to become too dull before re-sharpening can fatigue the
cutter material itself, as well as ruin the geometry. In this case, talk to your supervisor or the owner
of the cutter before attempting to sharpen the tool. The best option might be to just return it to the
person who ruined it, as is.
Edges, Material and Proles
The main work piece material consideration when sharpening an end mill is the relief angle at and
behind the cutting edge. The exact type of relief is generally unimportant in most cases. Harder ma-
terials require the use of a smaller relief angle, so the cutting edge has enough thickness and support
to withstand the higher cutting forces and greater heat generated during cutting.
Inhardermaterials,edgesshouldbehonedtosuittheapplication.Ahoneservestoreneandrein-
force the edge, allowing for a more uniform distribution of the stresses that break down the material
beginning at the moment of highest stress over time.
Every material has an endurance limit. When a carbide cutter is too “fatigued” it will show in chipping
andakingatthecuttingedges.Thiswillbemoreapparentinthehardermaterialssuchascarbide.
Iftheedgesandtheute(rake)facearebadlychipped,thecuttershouldbere-utedtogetinto
sound “un-fatigued” base material before putting the tool back into service (best done on a CNC).
Do not over grind the diameter to get rid of the chipped utes or the tool geometry will be
ruined, reducing tool performance. The CM-01P DC Tower has been designed to mount a variety of
wheels,severalofwhichcanbesettogrindtheuterakefacefreeofchipsandspalling.Thisproce-
dureisanacquiredskill,asitisnotaxturedoperation.Ifthetoolsareexpensiveperformancetools,
they should probably be reground on a CNC.
Finally, if the tool has been ruined through overuse it is most likely not a candidate for regrinding and
reintroduction into the same production environment from which it came (with the exception of ends,
which can be easily cut off, getting you into good material).
General Approach
Never wait until the material shows signs of fatigue to sharpen. The best approach, as far as pro-
cedure goes, is to regrind the primary relief until all of the wear has been removed, being careful to
preserve as much diameter as possible. Be careful to closely check the factory angle as you start, for
reference.
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