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- May 16, 2005
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I can't really see any difference in MM's pics other than the second pic has wider shavings. With standard gouge orientation, you get more of the Archimedes type spiral, which I can get with a scraper, and as they fly off the tool and lathe they do helix a tiny bit. Yours and MM's are more the helix type I guess. I think the high shear angle lifts one side off first, and the other side of the shaving comes off second, so maybe that is why it twists.
Look again. The reason they twist, as before, is that one side is longer than the other, and has to travel farther to get the same place. You are enlarging the inside diameter, so if the shaving is unbroken, it must be longer on one side. Shear face removes a 1mm wide shaving perpendicular to the surface. Skew takes the same 1mm difference over a shaving more than 1mm wide, making a gentler twist.
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