On Oct 2, 5:07*pm, Wes wrote:
"DoN. Nichols" wrote:
* *When boring, you want to err slightly on the above center
position, because when the shank deflects, it will move the cutting edge
away from the workpiece. *Below center can cause it to dig in, and even
*on* center can do that if the machine is not rigid enough.

Just out of curiousity how do you set center when boring? *When I'm turning I place my
scale between the tool and work piece and look to shee how it is leaning.

Do you do the same trick with the boring tool against the od?

Wes

I turn the boring bar to a slight positive rake, rotate the holder and
set it to height against the tailstock center. It's easy with a 40
position Multifix post, and IIRC I got it pretty close that way with a
Dorian. You could make a setting gage from sheet aluminum by placing
one edge across the ways and sliding it against the tailstock center.

jsw