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Post by phoneman on May 14, 2019 9:37:09 GMT
I am a beginning turner. My modest collection of turning tools includes several skews. Included are a one inch Sorby oval skew and a large Lacer skew. The Sorby is factory ground flat. The Lacer appears to be factory ground with an eight inch wheel.
What are the pros and cons of flat and wheel grinding? Does the size of the skew factor in with how it is ground? (I can readily choose flat, eight inch or ten inch diameter grinding.)
Thanks.
phoneman
ps Alan Lacer's recommendation of using a safety drive center instead of the traditional pronged center has really boosted my confidence with the skew. I don't worry about catches.
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Post by Pete on May 14, 2019 12:08:10 GMT
Many years ago when I was doing the post apprentice journeyman part of my woodturning training, a part was presentation. holding a conversation with an audience while cutting wood at speed is an art form in it's own right! to practice this myself and one of the other students met in my workshop and proceeded to cut and talk, simple project, everything went well with the roughing gouge, slightly less jovial and complete with the spindle gouge BUT the skew!!! huge catch left skew pointing at the ceiling and me trying to hang on to it.... when my friend tried pretty much at the same point... what we learned that day is while the Skew is a great tool, it requires all of your attention.
Anyway back to the hollow grind bit!
Though it is most visible on shallow long grinds like the parting tools or skew's, all tools put on a wheel will have to some degree a hollow grind, this is less pronounced on a larger wheel or shorter bevel, but still there.
The metal behind the edge will one day be the edge, so when your edge is the low point of the hollow the new low point is even deeper into the metal, it stands to reason that the less hollow the better your tool will be over time. This is not an issue on the ProEdge style of sharpening as no metal is taken away from the top / bottom of the tool for the radius of a wheel system.
The real question is how often do you sharpen, and how thin does your skew have to be to risk flexing (you don't want a flexible skew!) I wouldn't use a 6" wheel ever again! but 10" seems a pretty shallow hollowing over the half inch or so of bevel and I think most tools will lose significant length before getting to any danger of the hollow becoming a week spot.
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Post by phoneman on May 23, 2019 9:10:41 GMT
Thanks, Pete.
My wet grinders use eight and ten inch wheels. I have trouble seeing much hollow with these sizes of grinding wheels. I agree with you about avoiding six inch small wheels. I think the debate goes back to the days when most grinders in small shops used six inch wheels.
As a beginner, I do not feel skilled with the skew. However, following Alan Lacer's advice, I purchased a safety center as my drive center. It slips instead of allowing hard catches. I feel comfortable (but not over confident) with the skew.
phoneman
ps I finally purchased a big Lacer skew. I think I have as much risk of flexing it as I do of bending a crowbar!
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Post by browne89 on Jul 2, 2019 9:24:05 GMT
Hello all, Is there any other tool than Diamond sharpening stone and file? My project will be complete shorly. I just need a jigsaw and a routertable. |
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Post by Pete on Jul 2, 2019 9:40:35 GMT
Hello all, Is there any other tool than Diamond sharpening stone and file? My project will be complete shorly. I just need a jigsaw and a routertable. Welcome, but I don't understand your question... |
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