Gene Heskett pravi: > On Wednesday 17 March 2010, Ian W. Wright wrote: > >>>>>>>>>>> If you use 0.4mm drill and have little "to high" >>>>>>>>>>> >> feedrate then this is >> recipy to broke that drill.>>>>>>>>> >> >> I regularly use 0.2mm drills and sometimes even down to 0.1 >> - and that's carbide drills drilling tool steel usually... >> Have you looked at the price of 0.2mm carbide drills >> recently?? Fortunately, I can often get hold of a few 0.3mm >> and above drills ex. the printed circuit industry but they >> are getting harder to find recently and anything smaller >> than that is usually special order... >> >> Ian >> _____________________ >> Ian W. Wright >> Sheffield UK >> > > And what sort of a microscope do they use to sharpen such a tiny beastie? > > Or do they just cnc the sharpening process and assume its good? > > Just special jig and cnc sharpening. No microscope. ... And sharpening is little rought word for that. It's best described with word polishing as operation is done with cooper disc and diamond polish. (at least 5 year's ago when I was do that few times.
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