Randalthor
Cast Iron
- Joined
- Mar 7, 2018
- Location
- Kansas City
I have been using a Criterion boring head in my Bridgeport. The Criterion bars which came with the head don't handle interrupted cuts well.
I have wanted to try using a bar with inserts. After reading past threads on the forum, the consensus seems to be that sclrc boring bars using ccmt inserts are a good choice in a boring head, if one is looking for a tough insert.
Mesa tools seems to have some very reasonably priced USA made bars. I spoke with the owner about a CCMT bar w/ 3/4" shaft he sells. He indicated the a 2" hole was the smallest hole that bar would bore because the bar had an 11 degree rake.
That's the part I don't understand. Why would a 3/4" boring bar require a 2" minimum hole to start? I'm sure there is a reason, but I can't picture the geometry in my head, as to why it can't bore a smaller hole.
Here is a pic of the boring bar.
3/4″ x 4 1/2″ RH Boring Bar w/CCMT-32.51 | mesatool
I have wanted to try using a bar with inserts. After reading past threads on the forum, the consensus seems to be that sclrc boring bars using ccmt inserts are a good choice in a boring head, if one is looking for a tough insert.
Mesa tools seems to have some very reasonably priced USA made bars. I spoke with the owner about a CCMT bar w/ 3/4" shaft he sells. He indicated the a 2" hole was the smallest hole that bar would bore because the bar had an 11 degree rake.
That's the part I don't understand. Why would a 3/4" boring bar require a 2" minimum hole to start? I'm sure there is a reason, but I can't picture the geometry in my head, as to why it can't bore a smaller hole.
Here is a pic of the boring bar.
3/4″ x 4 1/2″ RH Boring Bar w/CCMT-32.51 | mesatool