emc can use a touch probe. most touch probe programs I've seen are
concerned with finding Z heights at multiple X,Y locations, but there's
no reason that you couldn't write a program to find points on the
perimeter of an object instead.
In emc 2.2.x, the only probing move is g38.2, "straight probe". In
2.3beta1 there are additional kinds of probing moves which make it
possible (in conjunction with o-words) to write sophisticated probing
routines that minimize movement.
Here's a screenshot showing how little wasted movement there is when
probing the surface of a hemisphere:
http://timeguy.com/cradek-files/emc/smartprobe.png
this is using the 'smartprobe.ngc' program in 2.3beta.
Jeff
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