nvdmc
off to a rocking start
Member since July 2016
Posts: 2
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Post by nvdmc on Mar 13, 2017 23:58:13 GMT -5
how to make inside curves on cabs?
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zarguy
fully equipped rock polisher
Cedar City, Utah - rockhound heaven!
Member since December 2005
Posts: 1,791
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Post by zarguy on Mar 14, 2017 1:23:13 GMT -5
The smaller the wheel, the tighter the inside curve. I bought a couple of 4" hard diamond wheels. Someday I'll make a Pixie clone, building my own soft wheels out of turned wood, plastic or something wrapped with a spongy pad & then coated with diamond powder in epoxy. Lynn
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Post by rockjunquie on Mar 14, 2017 9:30:01 GMT -5
Like Lynn suggested- you use the curve of the wheel to make curved edge and then hold the cab at an angle to cut for the dome. It isn't easy to explain- better to experiment.
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Post by jakesrocks on Mar 14, 2017 10:40:58 GMT -5
I bought a set of 1/2" X 6" convex wheels from Jadecarver a while back. I'm slowly converting an old 6" arbor to hold the wheels with a 2" center to center gap between them. The intention is to build a machine just for freeform cabs with inside curves. jadecarver.com/index.php/product-category/grinding-wheels/convex-grinding-wheels/They aren't cheap, but they're good quality wheels. If you plan to do a lot of inside curves, these might be just what you need. My machine when finished will hold 5 wheels & a polish wheel on the right end.
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Post by Bluesky78987 on Mar 14, 2017 10:45:08 GMT -5
Yeah, 6" wheels work pretty well, but a Pixie would be the best.
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zarguy
fully equipped rock polisher
Cedar City, Utah - rockhound heaven!
Member since December 2005
Posts: 1,791
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Post by zarguy on Mar 14, 2017 19:13:27 GMT -5
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Post by Bluesky78987 on Mar 16, 2017 16:06:35 GMT -5
I just had an "Oh wait, what?" moment. So, one could take the 6" wheels off their 6" cab machine and temporarily put on 4" wheels. Huh! (I never think of this kind of stuff, thanks for triggering the thought Lynn.)
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Post by parfive on Mar 16, 2017 17:19:06 GMT -5
Inside curves equal to/or bigger than the curve of the wheels are easy enough.
Tighter curves can be worked using the edge of the wheels. A little tricky, maybe, on a 100 hard wheel to start, but no big deal on the following Novas.
NG on a Genie with the wheels so close together. Best on a homemade machine where you can juggle wheel arrangement and spacers in less than a minute. I’m guessing most expando setups would give you enough room too.
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Post by deb193redux on Mar 16, 2017 22:20:47 GMT -5
the 1" drum on glass grinders can help too
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metalsmith
Cave Dweller
Member since October 2012
Posts: 1,537
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Post by metalsmith on Mar 18, 2017 15:33:24 GMT -5
I've cut some with 40mm diamond disks for a dremel (type)
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