beecrofter wrote:
On Jun 17, 4:02 pm, "RJ" wrote:
I've been using my Dremel tool
to etch flat river rocks. It does a pretty good job,
and makes some nice souvenirs for our visitors.

Problem is, I haven't found a bit that'll stand up
to any amount of engraving.

I tried a "diamond-chip" bit that went smooth
in just a few minutes.

Right now, I'm using a small stone grinder bit.
It's holding up OK, but the lines are coarse.

Any suggestions on what I might use
on this pretty tough rock... ??

rj

water and a drop of dish soap, dry grinding will kill the bits

Plus, you might want to slow the tool
down a little. That,
along with lube, will keep the bit cooler.