"jtaylor" wrote in message
...

"Jerry Foster" wrote in message
. com...
Two things are important.

First, the grinder must have a good "fine" wheel. The one which
typically
comes on the grinder will probably be of poor quality. But a good one
is
not very expensive...

Local place has 6" silicon carbide wheels on sale for about $17, 80 grit.
Whaddy think of that price and grit?

What's more important is what do you intend to grind with the wheels?
Silicon carbide (green or black wheels) is not to be used for HSS under any
circumstance. Only aluminum oxide should be chosen for grinding on steels
of all kinds.

If you're grinding brazed carbide tools, the 80 grit green wheels work, but
I rarely ever use one. Silicon carbide is really bad on your health, and
just about as hard on carbide. The hardness of carbide as opposed to
silicon carbide is not great enough for decent cutting. Diamond is the
abrasive of choice for sharpening carbide-----and the difference between
diamond and silicon carbide is huge. If you're talking about sharpening
carbide, I strongly suggest you investigate a diamond wheel and forget about
the silicon carbide idea. It's a decision you'll never regret, unlike using
green wheels.

Harold