On Tue, Jul 13, 2010 at 8:32 PM, Jonathan Hallameyer wrote: > > >> >> Unfortunately no I need to reliably and respectably detect movement on >> the order of .001mm or better so spring loaded things wouldn't work >> Basically the idea is to have 3 points of contact and then detect when >> one of them opens. >> >> > > Ahh, well the "3 points of contact and detect when one opens" sets off > bells in my head, especially when related to machine tools. Some CMM > systems use a similar method, where the touch head is connected to a Y > shaped piece, lightly spring loaded against the main housing of the probe > head. The main housing has a saddle for each pin of the Y shaped > pin sticking out, (so actually 2 contacts at each pin) and it looks for one > of the pins to lift and go open. (well they actually look for the > resistance starting to increase, but they do all sorts of other fancy stuff > which I cant recall) I could have sworn I saw this on a video on > renishaw's website, but cant find a reference for this again. Is there a > reason a standard tool setter wont do for you? > -Jon Hallameyer > > > And of course I find it minutes after posting. http://www.renishaw.com/en/probing-glossary-and-terminology--12479 a few graphics explaining what I was saying more clearly. --Jon Hallameyer -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist