Two techniques for you
Hi,
When I am cutting mother of pearl, reconstituted stone or Abalam (an abalone shell product) I glue my sheets to a backup board with white glue and then boil them in a microwave to release the parts.
For things that cannot be boiled they can be glued to a thin backup board then that can be sanded away on a drum sander. For Acrylic you could sand until almost there (if the finish must be maintained) then soak in warm water to remove the rest of the backup board.
-James Leonard
James Leonard - www.DragonCNC.com - www.LeonardCNCSoftware.com - www.CorelDRAWCadCam.com - www.LeonardMusicalInstruments.com