cobbledstones
spending too much on rocks
Member since January 2014
Posts: 482
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Post by cobbledstones on Dec 26, 2016 23:41:48 GMT -5
the local aviation industry and other military industries make parts out of some pretty exotic ceramics (made with carbon vapor deposition and other techniques). In any case, there are diamond tools available every now and then as industrial surplus. My Christmas present to myself this year was to pick up as much as I could, 10 cents on the dollar or better. all of it will require some work to adapt to lapidary practice, but I am excited to about the haul. suggestions for uses welcome. these are milling bits intended for a big cnc machine. 1/2" shaft, 1" covered with 15 or 80 grit diamond, cutting diameter is 3/4" 15 grit pictured, got 30+bits total bunch of scintered saw blades, 16", 2x14", 2x12" and a 6". the larger blades all have the huge arbor/hub hole, will have to think about how to make these usable. grinding wheels, these have a resin mesh layer about 3/16ths all around. 1"wide, 14" diameter and have a 5" hub hole. Got 120 grit, 220 grit and 5 micron. this monster is 20" diameter, 8" hub hole 80 grit solid wheel, weighs about 50 lbs and finally, I found a d14 poly arbor and its big brother at a rock sale. I plan to use the 12" poly arbor for the 14" resin mesh wheels above. Will have to make something serious for the big wheel. happy holidays
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Dec 27, 2016 5:25:17 GMT -5
You can get a sprocket(small pitch, larger diameter, small hole) and attach the large bore blades and wheels to it. (Trying to dodge expensive machine shop) Drill blades/wheels and sprocket and then bolt them together with 4 bolts 90 degrees apart. Look at 'Martin' brand sprockets. Probably have to mount the sprocket on the arbor and spin it to find and scribe center point. The 20 inch wheel need not spin fast, maybe 400-500 RPM if that. Even 200 RPM. About 1/4 the RPM of an 8 inch cab wheel whatever that is. Slower will not hurt. You have 3 X 20 = 60 inches of 80 grit diamonds coming at you every rotation. sweet
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Dec 27, 2016 5:50:40 GMT -5
Maybe a Home Depot 1/2" bench top drill press for the CNC bits. May not spin fast enough though. 3/4 inch bits better at high speeds 3000-5000 rpm. 15 grit diamond may not have to spin fast to grind quick. But they will fit in a standard 1/2 chuck, maybe a there is a 1/2" chuck adapter for an arbor like a lathe uses.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Dec 27, 2016 5:59:13 GMT -5
Not sure what they were cutting with the diamonds. Just beware, quartz gems are hard and may remove diamonds quickly depending on how they are bonded.
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Post by Psycho on Dec 28, 2016 19:50:47 GMT -5
Those monster grinding wheels are similar to the ones we used for grinding glass when makeing car windows for PGW. Takes one hellish spindle to run those bad boys but that could run literally thousands of Windows before replacing.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Dec 29, 2016 4:43:31 GMT -5
Those monster grinding wheels are similar to the ones we used for grinding glass when makeing car windows for PGW. Takes one hellish spindle to run those bad boys but that could run literally thousands of Windows before replacing. Yes, looks like wheels for glass industry. Never tried them on quartz materials.
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Post by Psycho on Dec 29, 2016 5:20:37 GMT -5
I know the diamonds in those wheels are high quality usually. Once you develop a spindle or gear to run them, you will have a very high end grinder. Those boring and finishing bits would be nice for freeform cabs, especially on those inside curves, wish I had a couple to make a water fed router grinding unit. You got lots you can do with any of that stuff.
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