I'm new to this group because it is an active group and I think I might find what I need here. That said...I make Tiffany-style translucent stone lampshades and cut 3/16" slabs using an 18" diamond slab saw. The largest slabs I can cut are about 7 1/4" on a side. This saw leaves striations on the cut surface which need to be sanded off and further sanded to a pre-polish and then polished on a polishing drum. At present I am using a high speed dry sander manufactured by Richardsons rock ranch. As you can imagin, this is a tricky operation with 3/16" slabs. Also the pieces will get very hot if sanded too long and they can be cought by the sanding disks and discharged violently...arrrg!
Once the pieces are polished I can begin to cut out pattern pieces. My issue has been that it takes a very long time to go from the slabs to a polished piece of stone. I currently use translucent stone which veries in hardness from relatively soft to gem quality brazillian agate.
What size lap do I need to work my 7 1/4" slabs? I don't have any experience using a lapping machine, so your expertise is necessary.
Needing your advice
Gary A. Betts