> As an aside, is there a standard way of doing this in machining?

Yes, use a combination square with a center head.

http://www.suncoasttools.com/shop/CombinationSquare-Protractor-CenterGage-Ru
le.html

The, "V" shaped, center head mounts on the rule so that the edge of the rule
runs dead center in the "V".

Here's a really nice one with the head installed.
http://www.starrett.com/squares.htm

Paul

=========================================
Paul Hutchinson
Chief Engineer
Maximum Inc., 30 Samuel Barnet Blvd.
New Bedford, MA 02745
phutchinson@imtra.com
http://www.maximum-inc.com
=========================================

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