jamesp
Cave Dweller
Member since October 2012
Posts: 36,353
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Post by jamesp on Oct 13, 2018 8:15:09 GMT -5
Another experiment if you will. How much material do you have to remove to make a sawn rectangle become a desirable shaped pendant. Sawn rectangles are about as easy as it gets for a tumbling shape. Answer is quite simple. Coarse grit till you reduce the rectangle from 3/8" thickness to 3/16" thickness. Coarse grit till you reduce the rectangle from 1/4" thickness to 1/8" thickness. Doesn't get much simpler than that. That requires a lot of material loss. Some have access to lots of fine rock and the supply is abundant. This method may suite them best. And some agates are stubborn to shape and the cost of tumbling + abrasives has to be considered. In my case the material is glass which is fairly inexpensive and soft making the shaping process quick. These are the shapes I get repetitively on all types of rectangles from perfect square to elongated. Silhouette, note how corners are rounded nicely ![](https://c2.staticflickr.com/2/1912/44376710045_573c58e8d4.jpg) Near prefect radiused edges from both directions ![](https://c2.staticflickr.com/2/1928/44566216434_be1f1e85ea.jpg) ![](https://c2.staticflickr.com/2/1943/44566222634_989a5b3038.jpg)
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