How to Carve Thin Deep Grooves?

["daedelus lanthanien" <daedeluslanthanien@zzzzzzzzzzz>]

I am working on a marble piece and need to cut some
deep (up to 1.5 inch depth) grooves in the stone that
are quite narrow (.12 to .25 inch width).  I have been
using a flex shaft grinding device with small foredom
burr attachments.  The work is proceeding very slowly.

Is there an alternative method or tool I could employ
using some sort of chisle or alternate grinding
device?

Regards;
Bill Pulling

Hi Bill, I ran into the same thing setting a background for a relief of
Acanthus. I stepped up to a 18,000 rpm air grinder chucked with set nut and
really good Ingersol Rand burrs. The burrs I purchased were face types for
plunging. The flat surface of the set nut is a nice stable guide. I was able
to really cruise once I had my line established and the business part of the
burr was buried. I just keep pulling the smooth part of the shaft down my
line. You can really get on the grinder harder that way while maintaining
accuracy.. I do not think there is a much faster way. I hope the methodology
helps though.

daed