Erik Christiansen wrote: > On Sun, May 03, 2009 at 09:26:40AM -0400, Gene Heskett wrote: > >> This I would do, if I ever have the problem. I have also probed for contour >> several times and have not had any errors of more than a thou or two in the >> data. This using the sliding tube opto-interrupter device one of the guys >> here gave me a link to when I asked about that a couple of years ago. Home- >> made of course. :) >> > > It's heartening to hear that it can be done without optos. > > Since the link http://www.hedingrips.com/Dcp00470.jpg, posted by Dean > Hedin on 25 April 2007, now gives error 404, I was wondering if my > imaginings of a pair of concentric tubes with a hairline aperture, > closing on contact, are anywhere like the real thing? (I'm trying to > figure how to have enough light for the detector when open, yet shut > with little probe motion. Or is it just that the movement to close the > aperture is known, and can be subtracted?) > > Cheers, > Erik > > Thanks All, I think I will use my wire for a doorbell or something. I don't need to add to the problems of getting my home made mill to run. Thanks to all Doug
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