Boreing has not produced the finish that I am looking for. Looks like the poly
is soft enough tat it springs back after the boring bar passes, leaving a rough
surface. I have made many smaller bushings, bored or drilled, then reamed to
end up with a slick finish that I could not produce any other way. I drill with
a 3/4" drill bit, then ream to 0.750 and it comes out perfict every time. Need
to reproduce the same results in 1". BTW, a fortsner bit yealds a better
surface that my indexable boring bar, but still not good enough to please me.
Thanks!