On Oct 1, 4:36*pm, (Doug Miller) wrote:
In article, DerbyDad03 wrote:

If he mounts it off-center and moves his tool in and out (his cutting
tool, for all you perverts) with the correct timing, he could get the
3" radius.

Not possible. Remember, he's starting out with a 3"x3" square timber. To get a
3" radius quarter-round out of that on a lathe, you'd have to mount the lathe
centers right at one of the corners.

It is not impossible. Like Derby said, you just have to synchronize
the in and out feed with the rotation. Effecting this is left as an
exercise for the reader.

I wonder if the OP has a router...

R