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Post by johnjsgems on Jan 3, 2013 15:14:22 GMT -5
BD equipment goes from the diamond griinding heads to their resin diamond pads for the finer grits.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,161
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Post by jamesp on Jan 3, 2013 15:35:08 GMT -5
I need to look at those arrangements.Are they viewable on your site?
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Post by johnjsgems on Jan 3, 2013 21:22:22 GMT -5
No, but you can see them on the Barranca Diamond site.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,161
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Post by jamesp on Jan 3, 2013 22:14:58 GMT -5
Thanks
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cherdarock
starting to spend too much on rocks
Member since December 2012
Posts: 140
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Post by cherdarock on Jan 6, 2013 1:18:54 GMT -5
By the looks of the way the grinder is mounted to an Ibeam, a seal over the mounting hole would allow a spritz. A catch tub underneath, submersible pump, bam! no dust. superfine dust from stone isn't just dangerous as it is generated, and if you don't have a RESPIRATOR, and are content with a tittycup mask, you are breathing the superfine. When you are done, and brush off, slap the dust away, there is always some left in the clothes. look at a sample of the dust you generate from each grind through a microscope. LOTSA very sharp lil'buggers! Hold your breath and remove your shirt, and wipe down with a wet paper towel. Minerals can include silica, and I read of one guy who was dry grinding chrysotile thinking it was something else. He didn't do so good. Many forms of mineral dust are highly dangerous. ALSO! Some forms of shell (fossils) generate poison fumes when ground or heated as with dry grinding or cutting. Please show some more pics? you can make wet grinders really easy! ;D
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,161
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Post by jamesp on Jan 6, 2013 8:48:41 GMT -5
This is over kill.The I-beam is also an anvil.A wood frame would do fine.Just do not tighten the steel clamps too much or you will bind the bearings in the grinder.I prefer giant tie wraps. Water is the best way cherdarock.I have put the garden hose with i tiny spray hitting the work.That wheel slings it well and it never gets the grinder wet.
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cherdarock
starting to spend too much on rocks
Member since December 2012
Posts: 140
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Post by cherdarock on Jan 7, 2013 0:04:16 GMT -5
GOTS to love that set up. Too efficient to dwell on any possible danger. Just don't let a rock catch a groove. *PtWRRRrrrrr* (ricochet noise)
Going to post how to mod a trimsaw (h2o) to get some grinding finnesse'... LOVE the pics.
YAH! Out proj-in' ;D
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,161
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Post by jamesp on Jan 7, 2013 8:15:56 GMT -5
Good luck on the trim saw grinder cherdarock.Post pics pls
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,161
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Post by jamesp on Jan 18, 2013 11:23:10 GMT -5
I have ground 20 pounds of agate for tumble.This wheel is as good as my $80 one.The diamond matrix is 8 mm and the high dollar is 5 mm.Diamonds must be about 50 grit.Best if spun at 1000-1800 max.3600 is chipping.Or even slower than 1000.Need to find an adapter to go from 5/8 thread to hole to put shaft in.Also bought a 120 grit diamond cup from another company-jury still out on it.And by the way,10,000 rpm on the angle grinder will shatter/chip your agate.To violent.Been grinding dry with fan for dust 'diversion'.
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Post by johnjsgems on Jan 18, 2013 20:12:12 GMT -5
BD has a core drill adapter 5/8"-11 male thread to 1/2" round or triangle. The round could be used with a sleeve type coupling to a 1/2" motor shaft. Or have the female version of the adapter made to fit your motor.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,161
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Post by jamesp on Jan 19, 2013 7:42:54 GMT -5
Let me find an AC motor John.They have those weird slower speeds like 1080 and 725.I will then get shaft size and ask you to sell me what i need.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,161
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Post by jamesp on Jan 19, 2013 7:59:36 GMT -5
Here is an old diamond cup wheel.It was used for years to make a flat spot on the bottom of agate specimens in the 2-6 pound size category John.Since building big tumbler several months back i have been pre grinding with this wheel.I would guess that i heavily rounded 100 pounds of agate in that time frame.It quickly put the saddle shape in the diamond holding matrix.That shape is perfect for tumble rounding.This is an Assassin wheel w/50(coarse grit).It is made for up to 13,700 rpm.I run at 10,000 but damage a lot of agate at that speed so i put it on the 3600 center feed and it is much freindlier.Still too fast to avoid fractures,so now shooting for 700-1000 rpm.I also use velcro backed diamond/rubber pads requiring water and less than 3600 rpm for heat reduction( or else melt the rubber matrix).They are great for fine work.But pregrinding hammer broken agate to roundish state is a diamond eater and requires metal matrix for such heavy work.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,161
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Post by jamesp on Jan 19, 2013 8:00:59 GMT -5
Saddle
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,161
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Post by jamesp on Feb 14, 2013 9:50:32 GMT -5
The $29.99 diamond wheel from Harbor Freight is living up to a lot of use.It will pregrind atleast 100 pounds almost eliminating 60/90 step.It looks like the one in the photo above but the diamond matrix is way thicker x3 about 5/16.I slowed it to 3600 from 10,000 RPM.Much more comfortable.A dip tray will almost eliminate dust if you grind 3 seconds then dip 3 dip 3 dip etc.The savings in power and tumbler wear and tear is worth $30 for 100 pounds-it would do 300 pounds if you did not have really jagged hard stones like mine.
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