wrote in message
news:14522200.383.1324097638634.JavaMail.geo-discussion-forums@yqio4...

Last night on my little Rockwell 21-100 mill, I was changing the radius on
the underside of rifle scope base with a boring head.

As I raised the knee, there was cutting close to me, and then as I lowered
the knee there was a new .001" of cutting on the mill side.

Is my vise too heavy? are the knee gibbs loose?
What is going on?

TIA

It could be several things, but the most obvious is that your cutting tool
has different geometry relative to the part when it's cutting in one
direction versus the other. It's either digging in more in one direction, or
it's pushing away from the work more in the other direction.

--
Ed Huntress