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Thread: Lathe finishing tool
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19th Dec 2021, 12:22 AM #1
Lathe finishing tool
Found this in a 1942 Machine shop book.
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19th Dec 2021, 02:32 AM #2
Hi Morrisman, Guys,
I use a "Shear tool" for fine finishing particularly if I'm going to run a ball race on it !
shear.jpg
The only problem with this kind of tool is that you can only remove a thou or so ! But you do get an extremely smooth finish. The cutting edge slopes back about 30 degrees with a few degrees of rake on the front face, and its not sensitive to height. If you wear the cutting edge you just move the tool up or down a few thou. I hone the edges to get it really sharp.Best Regards:
Baron J.
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19th Dec 2021, 08:03 AM #3Mechanical Butcher
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Morrisman's tool has the shear edge nearly horizontal.
Baron J's is nearly vertical.
I wonder if there's an advantage either way?
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19th Dec 2021, 09:07 AM #4Most Valued Member
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The Hercus Textbook of Turning recommends the same grind for truing up a faceplate.
Chris
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19th Dec 2021, 09:27 AM #5Mechanical Butcher
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19th Dec 2021, 10:05 AM #6Most Valued Member
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19th Dec 2021, 10:24 AM #7Senior Member
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19th Dec 2021, 11:36 AM #8Most Valued Member
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19th Dec 2021, 09:00 PM #9
Hi Guys,
I have occasionally unintentionally used my shear tool as a normal lathe tool ! However the swarf that you get from the Shear tool used properly is like a very very fine wool, "Fairy Hair" is a good expression to describe it.
You can get a similar cut on an internal surface using a round tool ground with a flat on the end ground at an at an angle ! Really good for through holes but you cannot get right to a flat bottomed hole. The way I've dealt with that issue is to take the bottom edge of a bore off for a mm or so.Best Regards:
Baron J.
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