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> I have been struggling to cut a seat in 22K tubing with a setting
> bur. This was not a problem a few years ago and has more recently
> become impossible. I have called the techs at both Stuller & Rio
> Grande and they usually suggest another brand of bur.
We just happen to have Phil Poirier here in the building this week
teachingsome Hydraulic Press classes. He works a lot in 22k and so
we asked him. He had this to offer.
He said that a bur with less teeth will not help, it will chatter
and you will still get the same burnished effect because the bur is
rotating too fast with a flexshaft. What he recommended is that you
cut the seat by hand only making a 1/4 turn at a time then clean the
bur on a file cleaning brush after each 1/4 turn.
I hope this is of some help.
Rio Grande Technical Support