Geometry of woodturning

**robo hippy** · 15th August 2010, 04:10 AM

Oh, this makes my head hurt!!!!!!!!!!!!!

I don't think there is such a thing as a perfect cutting angle, and/or bevel because there are too many variables. Bevel angle is one thing, how the tool is presented is another. If you drop the handle, you change the angle, as you rotate the tool, you change the angle, similar I guess to what happens when you drive over a speed bump; hit it square on, and you get a bigger bump, hit it from a 45 degree angle, and you get a smaller bump.

Scraping is cutting, as I can get nice long shavings and leave a fair surface, but that quality depends on the particular wood, and grain orientation.

I see no difference between shear cutting and shear scraping, the end result is the same, and can be done with a scraper or a gouge.

robo hippy

**NeilS** · 15th August 2010, 12:16 PM

Originally Posted by robo hippy

..... similar I guess to what happens when you drive over a speed bump; hit it square on, and you get a bigger bump, hit it from a 45 degree angle, and you get a smaller bump.

Must remember that one for the next time I try to explain shear cuts to someone.

I've often used the analogy of how you can use a wood plane with skew, but not everyone who has used a plane in that way understand what they are doing is reducing the effective cutting angle of the blade by skewing the plane.

.....

**Frank&Earnest** · 16th August 2010, 09:46 PM

Darlow page 42.

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