Hi all,

As an aside, is there a standard way of doing this in machining? In other
words, I have always wondered how  machinists find the exact center of a
part of circular cross-section, considering that the cross-section may only
be approximately circular. I have always done this by measuring across the
piece to find the longest line segment that I could across it (a diameter
rather than a general chord), and then measure half way across that, or
find two diameters and find their intersection, or draw a circle of the
same radius on paper with a compass, make a hole where the compass point
was, lay the circle on top of the part, and mark through the hole. However,
I was never sure if there was a better way to do it.

Sean

At 04:50 PM 1/10/02 -0500, you wrote:
> > From: Dipperstein, Michael
> >
> > Case 3 is the interesting one.  I haven't come up with a
> > formal proof, but I believe that the center of the original
> > circle is the point of intersection closest to the line
> > through your two initial points.
> >
> > -Mike
>
>Forget that.  I just came up with a class of counter examples.
>
>-Mike
>
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