On Fri, 22 Apr 2005 20:47:42 GMT, "William Graves"
wrote:

If you place a plate of thickness, t, between one jaw of a 3-jaw chuck and
now bore a hole,
what is the offset of that hole from the center of the original rod
(diameter, D).

One source says it is 2/3 of t. This might be = 1 / (1 + cos 60 deg) but I
failed to derive this with trig.

Anyone know how to derive this mathematically?
Anyone know if this is true?

thanks
-- - - - - - - - - - - - - - - - -
Bill Graves RKBA!



The formula is a good bit more complicated than that. Take a look at the
ECCENT.ZIP archive on my website for a program that implements the correct
formula.

Regards, Marv

Home Shop Freeware - Tools for People Who Build Things
http://www.geocities.com/mklotz.geo