Or any less effective, especially as you can gain assistance by using the
tool as its own "jig" when sharpening or honing. Follow the existing grind
by laying it on the wheel heel first, and raising to the edge. Slow speed
and fine wheels seem capable of renewing the edge in a single pass, or at
best a full R to L and L to R. Think of it as a powered hone.

Of course, there's always the problem of bi or trifocal lines for us old
fellows.

"Lyn J. Mangiameli" wrote in message
nk.net...

There is no reason to assume that the skills involved in unassisted
precision sharpening are any less vulnerable to natural variation than
any other activity requiring manual skills.

Lyn