Re: Turquoise real vs Inlace
Bill Boehme
I have used both and the plastic Inlace is fine for lower priced items if you are selling stuff. Turquoise Inlace turns turns easily unless you wait too long. If you wait weeks to turn it, it may seem as hard as the real stuff and real turquoise is as hard as ... uh ... hard rocks because that is what it is and tool edges don't like rock. Turquoise has a Mohs hardness of 5 to 6 although you will find that the "floor sweepings variety is much harder because the pieces usually are a mixture of turquoise and harder minerals such as quartz and that is the reason that it is floor sweepings. It will dull HSS in a second and carbide in just a few seconds. I have used a carborundum matrix type circle sawblade intended for bricks, concrete, and tile with the side held flat against an inlay of turquoise with light pressure and that will work if you want it flush, but it's a slow go. The idea of this technique being to knock off the high spots and not follow the contour of the surface. Use the tool rest to brace the blade. The difficulty is getting everything flush when grinding materials of differing hardness -- it's sort of like sanding southern yellow pine. I don't like having humps and valleys in a "flush" surface so getting it truly flush is the big challenge.
"Floor sweepings" are okay if you recognize that much of it really will be floor sweepings. You will also need something to crush some of the largest pieces. I use a large diameter pipe coupling with a plug on one end as my mortar and a pipe nipple with a cap as the pestle. Put a few chunks of turquoise in, wrap a rag around the top, and use a large two pound hammer. If your aim isn't too good, get somebody else to hold it while you hit the top of the pestle. The rag is essential to keep pieces from flying all over the place. This will also make you fully appreciate how hard turquoise really is.
From my experience, I would either leave the stones below the level of the wood and fill with Inlace or intentionally leave them proud. Grinding the stones flush was far too much work. Don't use CA because it is brittle and chips when you turn. Also, epoxy will yellow significantly over time. Inlace remains transparent.