Subject: Boring small hole in cres tube (counterbore?)

From: [email-masked] (Bob)
Date: 27 Jul 1996 22:47:11 GMT

I need to drill some holes 7/64" dia. through one side of the tubing
wall, not all the way through, in cres and cs tube. The wall thickness 
of the tubing is 0.220" with an I.D. of between 0.340" and 0.455" on
various pieces. My problem is after the hole is drilled, how do I get
a counterbore taper on the inside edge of the hole in the tubing wall 
to remove the raised metal residue left from the bit?
All ideas gladly accepted.
                                     Thanks, Bob

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From: [email-masked] (Dave Ide)
Date: 28 Jul 1996 01:35:25 GMT

Scrape them off with a .312 diamater bar faced off to have
  a good edge. Forget the countersink, nobody will see it.
                                          David Ide

Bob ([email-masked]) wrote:
: I need to drill some holes 7/64" dia. through one side of the tubing
: wall, not all the way through, in cres and cs tube. The wall thickness 
: of the tubing is 0.220" with an I.D. of between 0.340" and 0.455" on
: various pieces. My problem is after the hole is drilled, how do I get
: a counterbore taper on the inside edge of the hole in the tubing wall 
: to remove the raised metal residue left from the bit?
: All ideas gladly accepted.
:                                      Thanks, Bob

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From: [email-masked] (Craig C.)
Date: Sun, 28 Jul 1996 04:53:00 GMT

>All ideas gladly accepted.

Bob, check out Enco's catalog for a huge line of deburr tools. If you
can't find something there that will do the job for you, then you
might have to just make a tool to do the job.

Enco's phone number is 1-800-873-3626
Pages 162-166 of the 95/96 full line catalog are all deburr tools.

Craig