jamesp
Cave Dweller
Member since October 2012
Posts: 36,561
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Post by jamesp on Jun 4, 2016 10:00:26 GMT -5
Too slow for coarse grinding, fine for finish grits
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Deleted
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Member since January 1970
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Post by Deleted on Jun 4, 2016 10:15:42 GMT -5
Like 30rpm?
No drive belt on the posi drive?
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,561
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Post by jamesp on Jun 4, 2016 10:32:38 GMT -5
Like 30rpm? No drive belt on the posi drive? 15 RPM. Running some golf ball sized very clear quartz. Grinding off the frost from the faster speed. That size quartz bruises real easy. Scott, if you lean the tumbler forward so that most of the weight is on the driven shaft it rarely slips. Better of the bottom of the barrel rotates toward the saddle.
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Deleted
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Member since January 1970
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Post by Deleted on Jun 4, 2016 10:49:58 GMT -5
Or in my design, which is top secret, the driven shaft can be mounted say, 1/4", lower than the idler shaft. I'm still doing posi.....
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jamesp
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Member since October 2012
Posts: 36,561
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Post by jamesp on Jun 4, 2016 12:32:37 GMT -5
Or in my design, which is top secret, the driven shaft can be mounted say, 1/4", lower than the idler shaft. I'm still doing posi..... yes that will be no problem
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Deleted
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Post by Deleted on Jun 4, 2016 12:55:28 GMT -5
Or in my design, which is top secret, the driven shaft can be mounted say, 1/4", lower than the idler shaft. I'm still doing posi..... yes that will be no problem I woke up with some cool geometry in my head, drew it on the bathroom mirror with a sharpie. Guarantees parallel shafts, allows me to drop the driven shaft..... and more problems solved as well....
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,561
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Post by jamesp on Jun 4, 2016 13:47:35 GMT -5
yes that will be no problem I woke up with some cool geometry in my head, drew it on the bathroom mirror with a sharpie. Guarantees parallel shafts, allows me to drop the driven shaft..... and more problems solved as well.... indiana posted a cad cam of bearings mounted on wedged blocks to vary distance between shafts. clever, but you have to change posi-traction belts. Best to have posi. You can use a stretchy large o-ring say 1/4 or 3/8 inch cross section. Having a couple of inches of play/stretch helps. Takes very small belt to assist the other shaft. A heavy rubber band works pretty good.
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