On 14 Jul 2003 07:05:38 -0700, jim rozen
wrote:

In article , Gunner says...

One has to make the first part scrap to determine just what the
drawback of the collet will be, then all other operations are set to
that length.

OK, so at this point the best tolerance I could do would
be +/- 0.005 or so on the O/A length.

The second operation is generally a facing, which brings
it to proper length if the bar is a bit under or over sized, then all
other operations are done in order, followed by cutting off, which is
the start of the next cycle. This works really well if you are not
using dead length collets.

That obviously gets it a lot closer - but it takes another
tool location for the facing off. Either on the cross
slide or on the turret.

Jim


Correct. Lots of guys use the crosslide front position for this facing
op, With the cut off in the back position, cut off tool upside down
for chip control.

Add a tool, but get dead nuts accuracy.

Gunner

"What do you call someone in possesion of all the facts? Paranoid.-William Burroughs