In article , Harold and Susan Vordos says...

If they have segmented pieces that spin, that's what they are. Jim likes
'em, and even ol' teenut used to extol their virtues, but I'll put my
grinding experience up against their opinions any time anyone wants to have
a discussion. As I said, there is no better way to prepare a wheel for
cutting. By their nature, they leave very sharp grain when properly applied.
Problem is, it's hard to get a wheel running true. In order for them to
function properly, they require a given load, otherwise all you do is grind
away the components. They dress by hammering the wheel, breaking it into
fine particles. Assuming you can get the wheel running dead true, you
can then bear down adequately for the dresser to do a good job, but you can
waste a lot of wheel getting there, and it's not all that hard to get the
wheel to start bouncing again while you're using it. As I said, I avoid
them totally. Don't even own one, nor do I care to. If I had a large 3
phase grinder for grinding on weldments, I'd likely have a different
attitude. They're great for that application.

Yep, that sounds like a star dresser to me.

I've never had a wheel that ran out, right from the box, so I can't
say how poorly they would true one. They are pretty good for getting
the wheel opened up again, and they're pretty good at getting a flat
surface once it gets grooved or marked.

I've tried the SiC dresser stick that you suggested. I may have
been using too hard a touch on it, given your comments above.

As I said, I've never had a wheel that did not serve for at least
reasonable grinding, right out of the box. What are the chances
that there's just something wrong with the wheel(s) he mounted?

Jim


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