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Tangential tool holder?

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John McNamara26/04/2013 09:41:29
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1377 forum posts
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I have a commercially built Diamond tool and have found the clamping adequate I do not use it for deep rough cutting.

For roughing I like to use a negative rake (Carbide) tool bit in a holder.

For finishing to accurate size I prefer HSS tool very slightly rounded as mentioned previously. Finishing to size (to a tenth or two) with carbide is problematic, fine if you hit it in one but carbide due to the rounded edge, on most but not all tips does not like to cut a tenth or two, you get a less than nice finish. You have to cut deeper planning by dead reckoning to finish to size.

Sharp HSS I find is more forgiving, it is happy to peel of a tenth.

Hint use a dial indicator to indicate size, pressed against the cross slide to lead you in to exact size over the last few thou, miking the part after each cut. you may need to make up a jig to fit the dial indicator or use a magnetic base as I do. Unless you are lucky enough to have a digital readout fitted. The cross feed feed screw is out of its depth under .0005. it does not have the repeatability of a .0001" dial indicator.

Cheers

John

Andyf26/04/2013 10:15:31
392 forum posts
Posted by Les Jones 1 on 26/04/2013 08:50:34:

Hi Andy & Paul,
Andy, I was about to give the answer that Paul has give but then realised it is not quite true. The axis of the tool will be at about 12 Deg. to the tangent if the tool is at centre height. ( The tangent at centre height will be vertical.) I suppose it is just being pedantic arguing about the 12 Deg.

Les.

Exactly, Les. If it were truly tangential, the tool would rub rather than cut. But you're right; it was pedantic of me to mention it. Everyone knows what a tangential tool is.

Andy

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