Anthony wrote in
:

(Wayne) wrote in
news:51701a28.0407271631.2782c0c9 @posting.google.com:


After he left I tried my test again using the 1/64 bit. With the
steel bar it was still bigger at the headstock, but only by .001.
Using the aluminum bar it was off by .0005.

So if you are referring to being off by 0.001 diameter, it is out of
alignment by 0.0005 over 5"



On both bars after cutting toward the headstock, I left the bit
where it was, and reversed the feed toward the tailstock.
More material was cut off. When I measured them, it was only off
a few thou.


The extra material removal is from the flex in the
tool/toolpost/set-up when taking the inital cut. The information
about taper when doing this is irrelevant and unuseful due to that
fact. You would need to be able to measure the differences in the
flex of the tool tip in both directions in order to obtain any taper
information.



Ohh..One other thing:
a piece of 1" bar stock, freely ended 5x Ø out of the chuck *is* going to
deflect under cutting load. You may not have any taper in the machine at
all.



--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

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