Zoran
freely admits to licking rocks
Member since September 2005
Posts: 880
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Post by Zoran on May 21, 2006 15:54:56 GMT -5
Anybody knows max rpm for metal diamond wheels, for example type jadecarver.com is selling. I am interested in 6" wheels. I plan to turn to diamond instead of SiC.
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Post by stoner on May 21, 2006 16:16:13 GMT -5
That's a very wise decision Zotika. Once you start using diamond wheels you'll wonder why you ever used silicon carbide wheels. I'm not sure if there is a max RPM for the hard wheels because there's really no way of them falling apart, but most grinders run at 1725RPM. The expandable drums have a max of 1725RPM. I've been using a jadecarver 220 wheel now for a year and it's still got a lot of life left to it.
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snowdog
fully equipped rock polisher
RIP David Fildes, aka: snowdog
Member since January 2005
Posts: 1,527
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Post by snowdog on May 21, 2006 19:04:11 GMT -5
you should be able to just take off the stone wheels and put the diamond ones on --- will work just fine on the same grinder ---I got a new one from jadecarver too this winter --I got one of the curved ones (rounded) and does it ever take the stone off in a hurry!!----nice!!--good for curves only thing might be the size of the shaft --they usually come with a plastic knockout bushing so you just use the one that fits --not sure if your's is in inches or is metric? ----might tell them when you order the wheel what size the shaft is
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Post by gemkoi on May 21, 2006 21:01:22 GMT -5
Ya, 1725 is what my runs at and its an 8inch set up. snowdogs right. the arbor would be more of a concern. If you were running your 6inch and the grinder stone never flew apart. then there no worry if you go metal. The only other thing i suggest and make sure there no woble in the ardbor, becasue a metal core wheel can make it worse. personaly experince and heavy grinding. do'h!
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Post by docone31 on May 21, 2006 21:16:06 GMT -5
An example. If you run a diamond point at 7000rpm, it will wear out in a major hurry, unless you are very light with the point. If you run the same point at 15,000-30,000rpm, it will last a very long time. I operated a diamond planer years ago. It took about five minutes to come to speed, about 15,000rpm. It was a 12" wheel. After a broach made flat, the planer micro planed the piece. That was diamond on steel, with oil lubrication. With lapidary, it is not really a question of the wheel, as it is its effect of the grit on the stone. It has been proven that the best results come at 1725. Faster, and the grinding becomes unpredictable. Excessive chipping, galling, chatter. Slower, and the wheel labours too hard and is essentially inefective. So, the others are correct. If the SiC grit wheels held together and were predictable, the diamond will also work at that speed. Pressure is the issue. Go lightly and it will last a long time. Bear down and it pops diamonds out of the plating and wears down faster than desired. I have a lap on my faceter that is over 15yrs old. It still cuts well. It has only had the weight of the stone on the lap, rather than pressure. You will definately like diamond wheels. They do cut.
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Post by rocklicker on May 22, 2006 0:34:31 GMT -5
Good to hear you are going over to diamond wheels. Mine run at 1725 like others have said. If you have access to a stepped pulley I would suggest running them even slower at first. If you are used to using SiC and go to diamond you may end up grinding too much away too quick. That's what happened to me. Just a thought. With a stepped pulley you can adjust the speed back to 1725 when you get used to the fast cutting.
Stoner, I use a jadecarver wheel too and it is still very aggressive after most of a year. Right on jadecarver wheels! Steve
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Post by sandsman1 on May 22, 2006 1:09:36 GMT -5
if i remember right my genie runs at 1800 rpm so i guess up to that speed is fine for a diamond wheel
and a genie uses 6 inch wheels
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Zoran
freely admits to licking rocks
Member since September 2005
Posts: 880
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Post by Zoran on May 23, 2006 13:26:33 GMT -5
Thank you guys. That is what I wanted to hear. I am thinking of buying metal diamond wheels from jadecarver.com and expandable drum with diamond belts. Also planing to buy Lortone Beaver arbor. I am not sure about diamond wheels/expandable drum-diamond belt combination.
1st combination: 80 g metal diamond wheel 220 g metal diamond wheel 600 g metal diamond wheel expandable drum with diamond belts from 1200 g
2nd combination 80 g metal diamond wheel expandable drum with diamond belts from 220 g
What is better?
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Post by gemkoi on May 23, 2006 13:48:16 GMT -5
either combination would siute. the metal would be faster, but you would still have to watch out for facet like cutting you can get with metal wheels. Espically with a 600 grit wheel, on the dome of a cabochon you may get many angles of cut driections from using that wheel on hard stones. I use the wheel, but only for soft stones to tell you the truth, like opal or turquoise. And expando drum with belts helps with cutting a single surface on the dome of a cabochon, with no odd angles which you see as the cutter.
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Post by sandsman1 on May 23, 2006 13:48:52 GMT -5
zot if it was me id go with the first set up the wheels will last longer then the belts and theres less stoping and having to change belts ---but both will work what ever you feel works for you --- lortone sells a 6 wheel 6inch arbor i would by that bare bones and add my own motor and wheels and water drip--- this way you could get acouple side disc for polish and use them for 14000 and 50000 diamond and all you would ever have to do is spin on the polish wheels on the end of the arbor
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Post by joe on May 23, 2006 15:49:40 GMT -5
Hey Z, maybe consider this 80g diamond wheel 220g diamond wheel 280g Nova wheel- (soft diamond wheel!) 600g and up go with diamond belts Also, when you get wheels from Jadecarver be sure to request the bushing. 1'' to .75'' for Lortone Beaver.
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Zoran
freely admits to licking rocks
Member since September 2005
Posts: 880
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Post by Zoran on May 23, 2006 19:02:35 GMT -5
Thank you guys. This is very helpful. Joe why 220 diamond wheel and 280 soft diamond wheel?
Since money is the matter I was considering next combination: 80 g 1 1/2" metal diamond wheel at jadecarver.com - 63$ 220 g 1 1/2" metal diamond wheel at jadecarver.com - 63$ Expandable drum 1 1/2" 45$ 600 g Eastwind diamond belt 1 1/2 at Kingsleynorth - 30.50$ 1200 g Eastwind diamond belt 1 1/2 at Kingsleynorth - 30.50$ Two Spin-On Polishing Heads with felt at Kingsleynorth - 2x22$ Lortone Beaver 4 wheel arbor at Kingsleynorth - 190$ I have spare motor, so this combination would cost me 466$ without shipping costs. What do you think?
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Post by joe on May 23, 2006 21:04:56 GMT -5
Well, the 280g Nova was recommended to me by other members. It's to help remove the flat spots that cause me grief. You're real good at cabbing so you probably don't have a problem with it like I do. Your setup sounds great. I didn't know they made a 1 1/2'' expandable drum. I thought they were all 3''. Do they make a 1 1/2'' leather belt? That would be less expensive than two polishing heads. They better ship it to you fast 'cause I want to see the art you create with it!
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Duckbean
fully equipped rock polisher
Looking for rocks in all the wrong places
Member since February 2005
Posts: 1,072
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Post by Duckbean on May 23, 2006 21:56:08 GMT -5
They do make a 1 1/2 leather belt for the 6 inch expanding drum, that's what I use.
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Post by joe on May 23, 2006 23:29:51 GMT -5
Aha... live and learn! Thanx Duck.
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