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Cutting speed theory

What is it that determines recommended cutting speeds?

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John Olsen

24/04/2011 06:24:16

1294 forum posts
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Sam, I have had a nice hot piece from a shaper land exactly in the little hollow at the top of my breastbone. Of course , from there any frantic efforts to disloge it just result in it going on down your shirt.

With a big shaper working hard the swarf will be just on the point of turning blue...any hotter and you are probably going too hard for HSS. I have used carbide, with great success, and for those who think you shouldn't use carbide with an interrupted cut, what do you think happens in those insert milling cutters? The carbide bits I have used are of unknown type, just a triangular insert with no hole, brazed onto a key steel shank and sharpened on a diamond wheel to much the same angles as I would use for HSS. On a shaper, that is zero top rake and about five degrees front releif.

It is very noticable that the piece of swarf you get is not as long as the job was, so it has very evidently been compressed in the manner described above. A six inch long job might yield pieces of swarf about 3/4 of an inch long.

regards

John

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