Quite a lot of methods!
As it turns out I tackled things tonight with my 10" 4 Jaw independent chuck.
I used a machinists SQ and siscovered each one was a tad over .1 out of whack. Soooooo SInce there were saw marks from the bandsaw they used to lop off the slices..in the 4-jaw, with a .1 spacer in the one jaw, between the piece and the jaw.
Then I got the jaws in the ballpark...
THenb got a dial indicator and indicated Each jaw, till the pairs of jaws were symmetrical to each other. Yep Jonny was correct.. its NOT round. LOL
Turns out the opposite sides were off by around .02 SO as long as I got them true to each other, it was square?
Then I went ahad and put the dial indicator onto the piece.. right in front of the jaws.. and then went through more fine tuning of the positioning.. seems my 4 jaws are not exactly the same.
Once it was re-re-re-centered.. I then was able to put the dial indicator adjacent to a jaw.. then move the cross slide.. away from the chuck, and I was getting ZERO movement, letting me know it was square on all 4 jaws.
Once the first side was faced, it was a breeze to flip and re-center it. Standard 4 jaw methodology. (But I did quadruple check the measurements)
Drilled the center hole, and then began boring the center out to the dimentions I need.
I also have a arbor I will be able to mount the chunk on once its center id bored. THen it will go over to the mill and get the periphery holes banged out of it.
I will take a couple Pics tomorrow.
