This is a topic often discussed as well. I'd suggest you take a look at
http://mathforum.org/dr.math/faq/faq...e.segment.html and perhaps
download the spreadsheet. Plug in a chord length of a generous .375"
(beginning of bevel to edge) and the radii of 3" and 4" to see how very
little difference we're talking about.

Now notice that if you want the smoothest cut, you skew the edge, which
renders the concavity entirely irrelevant in use. Concavity is to
accommodate honing. You have to take less metal off to renew the edge,
because there's none in the middle.

If you're still a believer, might want to decide where, between 8 and 6, you
want to replace your otherwise useable wheel, and ship the unused portion to
me....

"Maxprop" wrote in message
nk.net...

"Ray Sandusky" wrote in message

it seems that the 8" grinders do not produce as
pronounced a concavity as the 6" on the bevels.
e
Is that pronounced concavity a good thing, Ray? I always understood it
was
undesirable, but perhaps I was misinformed. The books I have seem to
imply
that concavity should be minimized.

Max