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Post by roswelljero on Oct 19, 2009 10:05:59 GMT -5
I've never seen anyone cut preforms from a slab. How do you cut/shape round ones?
Later, jeri
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darrad
fully equipped rock polisher
Member since September 2006
Posts: 1,636
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Post by darrad on Oct 19, 2009 10:37:35 GMT -5
If you have a drafting template of circles those have the most variety of sizes but any template with circles will do. Use the template to trace the circle where you want it on the slab(super fine sharpie or welding pencil work) and cut down to almost the line with a trim saw.(Workforce works great) then grind, sand and polish to shape.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Oct 19, 2009 10:44:18 GMT -5
What stonewizard said.........but if Im not wanting to take the time with a saw, I get out my favorite tool, my tile nippers and just nip around the circle Ive drawn on my slab. This does not work however when you want to save pieces from the slab for other cabs.
Shan
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Post by Toad on Oct 19, 2009 15:27:27 GMT -5
You can nip it without having it break where you don't want it to? Well, I guess you can or you wouldn't be doing it.
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Post by Jack, lapidaryrough on Oct 19, 2009 18:50:49 GMT -5
Trim saw a round blank, glue it too a engine value and run it in the upward direction to the the diamond / SC wheel, face cutting downward.
I use SC wheels to rough cut, then to the diamond and expandable drum to finish.
Davis creek / Lassen cr. Obsidian, Tiger eye, Queensland agate, Holley blue, Small thunder eggs.
2.02 / 1.94 Chev values...i can do up to 4" round.
using agate, petrified limb / log, right angle cut each end glue a value on each end in a parole line,
Than two bearings on one end and a cordless drill on the other value shaft.
I Pre-form with S.C. Wheels first.
Many types of material look great in a round cylinder polished. rutilated quartz is my favorite.
Nice thing about the cordless drill is no shock, and it can be covered with a plastic bag.
Backgammon Stones, Some Day
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Post by Jack, lapidaryrough on Oct 19, 2009 18:52:53 GMT -5
Epoxy 260 our 330.....
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Post by roswelljero on Oct 19, 2009 19:53:04 GMT -5
... cut down to almost the line with a trim saw.(Workforce works great)... I used my Workforce for the first time last night to cut ceramic tile. Maybe I have the splashguard in the wrong place, but I couldn't see where I was cutting. There was also a lot of white water from the tile. Shan thanks for the tile nipper suggestion. I may experiment with that. lapidaryrough I'm not sure where I'd get an engine valve, but it does sound like an interesting technique! Thanks everyone! Later, jeri
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Post by Jack, lapidaryrough on Oct 19, 2009 20:54:57 GMT -5
... cut down to almost the line with a trim saw.(Workforce works great)... I used my Workforce for the first time last night to cut ceramic tile. Maybe I have the splashguard in the wrong place, but I couldn't see where I was cutting. There was also a lot of white water from the tile. Shan thanks for the tile nipper suggestion. I may experiment with that. lapidaryrough I'm not sure where I'd get an engine valve, but it does sound like an interesting technique! Thanks everyone! Later, jeri >>>>>>>>>>>>>>>>>>> New at Baxter Auto Parts / Any Auto parts store`s. Their are a few kid`s with toy`s of the 70s.
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Post by Tonyterner on Oct 20, 2009 10:44:11 GMT -5
I use the nippers too, they work well. If you want to cheat, a perfect circle is the hardest shape to cab, I use a hole saw bit in my drill press. I've only done it a couple of times but its the only way I can get a perfect circle.
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Post by deb193redux on Oct 20, 2009 10:53:07 GMT -5
I've used core drills (hole saws) too.
I have also played with a technique described on a beading website. Put a rough circular blank on the head of a nail, with the nail glued inthe center. Then put the nail in the chuck of a drill or rotary tool.
With the stone spinning, gently bring it against the grinding wheel. This will give a good circle, and also let you begin to round the edges evenly around the circle.
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rockdewd
has rocks in the head
Member since October 2007
Posts: 605
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Post by rockdewd on Oct 20, 2009 16:15:21 GMT -5
I don't get too finicky cutting round preforms. I cut out the general shape then dop it. Then mount the dop and stone in my cordless drill (safer then corded drill near water). Then I take the drill to the lapidary grinder and shape it on the 60 grit then sand on finer grades. for smaller stones I use the nail and rotary tool method as deb193redux mentioned...
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Post by roswelljero on Oct 22, 2009 22:28:24 GMT -5
More ideas! I love this place! ;D Thanks!
Later, jeri
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