Steve
has rocks in the head
Member since June 2005
Posts: 506
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Post by Steve on Jul 28, 2014 18:03:40 GMT -5
I got some granite countertop slab remnants, 3cm. My plan is cut out 4 five inch by five inch squares and glue them together to make a near cube which, I'll use to make a sphere. I've never had the occasion to glue pieces together. My question: one side is polished and one side is rough. I know that I'll need to grind off the polish and any sealer they've put on the slab and to smooth out the rough side. How smooth should I take it, is 220 good enough, is 600 good enough? I'll use a Lortone jiggle pan.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Jul 28, 2014 18:14:04 GMT -5
I have pondered this myself. I have many cutoffs also.
The granite guys do something similar when they make a "bullnose". They layer a second piece under the front edge of the soon to be counter, then shape and polish a edge detail. They do NOT polish the mating surfaces and they glue with colored acrylic glue.
I will use clear epoxy and therefore plan to take mine to 1200 grit.
@azrockgeek has made mosaic of stone slices to make spheres from. Tim, did you polish the sawcut pieces??
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Steve
has rocks in the head
Member since June 2005
Posts: 506
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Post by Steve on Jul 29, 2014 13:15:03 GMT -5
I spoke to another sphere maker who has done this. He goes to 220 when he wants to minimize the seam. At 220 it's still rough enough to get a solid bond. He indicated that going smoother will not give a less noticeable seam and you may not get as good a bond.
Sometimes he uses colored epoxy and wants the seam to show. Then he just glues off the saw cut. To get a mosaic effect he glues the slabs into a cube, cuts the cube into quarters, rotates the pieces and glues them back into a cube. I've seen his mosaic sphere, it's a cool effect, especially with his black seams.
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