sammygator
off to a rocking start
Member since June 2016
Posts: 11
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Post by sammygator on Jun 9, 2017 16:19:31 GMT -5
Hi everyone:
My grinding setup is an HP model B-52. I've got an expanding drum on the left, two sintered wheels in the center section, a muslin buff on the right (which I don't use) and polishing heads can be mounted on the right end of the shaft. The two diamond wheels are 80 and 200 grit. When grinding preforms to shape I use like to use the rest that mounts across the center section. I get a consistent angle for the girdle that way.
My issue is that it takes a long time to grind a preform to shape with the 80 grit wheel. I'm considering getting a coarser wheel to either add to the center section or to put where the muslin buff is currently mounted. I'm not sure if this is going to speed things up that much, though, and with a very coarse wheel (say 30 grit) chipping seems likely to be a problem.
Before spending the money for another wheel I thought it might be helpful to learn what methods/tools are being used by others to grind preforms to their initial shape. Good trim-saw technique obviously helps since there will be less grinding to do. If anyone is willing to share their preferred method/tooling for grinding preforms I'd be grateful.
Regards,
Sam
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sammygator
off to a rocking start
Member since June 2016
Posts: 11
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Post by sammygator on Jun 12, 2017 16:27:47 GMT -5
Guess this is maybe in wrong forum... 🤔
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Post by wigglinrocks on Jun 12, 2017 16:49:56 GMT -5
Guess this is maybe in wrong forum... 🤔 You are in the right forum , might be the wrong section . Try asking your question in the cabbing section . Sorry I can't help you .
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Post by rockjunquie on Jun 12, 2017 16:52:06 GMT -5
I think most people use 80 to start, including myself. I spend more time on the 80 than any other wheel. I like to take my time forming up the cab. I think you are right that a rougher wheel will be more chippy on the edges and a lot of stuff you wouldn't want to use the 80 on at all. Is your 80 dull or something? I don't really know what you mean by slow, since the 80 should be cutting pretty fast. I'm glad you bumped this or I would have missed it. Sometimes posts get lost in the shuffle, it happens
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Post by rockjunquie on Jun 12, 2017 16:53:32 GMT -5
sammygator I'm gonna move your thread to the cab section. You'll probably get more help there.
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<'))))>< Fish
Cave Dweller
Gone Fishing
Member since April 2005
Posts: 1,841
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Post by <'))))>< Fish on Jun 12, 2017 18:53:04 GMT -5
sounds like your 80 is worn out, buy a new one. 80 is the best to cut performs, if you cutting agates it may take longer.
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Post by pghram on Jun 13, 2017 10:25:02 GMT -5
I use 80 also. Mine has slowed down considerably, I've been using it for about 8 years.
How long is it taking you? Have you noticed a slowdown?
Peace, Rich
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<'))))>< Fish
Cave Dweller
Gone Fishing
Member since April 2005
Posts: 1,841
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Post by <'))))>< Fish on Jun 13, 2017 11:32:56 GMT -5
to cut a hard stone , to shape and dome, 15 min, on a soft stone 5 min.
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sammygator
off to a rocking start
Member since June 2016
Posts: 11
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Post by sammygator on Jun 15, 2017 14:35:01 GMT -5
Thanks to all who answered. I think the cutting has slowed, some, but it's hard to judge. I cut mostly agate and jasper. The bronze layer on the sintered wheel is still very thick so presumably not worn out. Would reversing the direction of rotation be likely to help?
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gemfeller
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Member since June 2011
Posts: 3,799
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Post by gemfeller on Jul 8, 2017 16:31:26 GMT -5
Thanks to all who answered. I think the cutting has slowed, some, but it's hard to judge. I cut mostly agate and jasper. The bronze layer on the sintered wheel is still very thick so presumably not worn out. Would reversing the direction of rotation be likely to help? My Neosint 60/80-grit removes stock very fast. I can preform very hard agate and jasper cabs in just a few minutes. Maybe your wheel is glazed and dressing might help, also changing rotation direction. How old is your wheel and how much use has it had? The only problem I have with mine is chipping along the girdle line. I have to be careful not to cut too close and to use my 220-grit for cutting the final girdle. Hope you're able to solve the problem.
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