On Thursday 26 April 2007, John R. Gabriel wrote:
>Dear Gene
> Thankyou for your kind note.
You're most welcome, John.
> The pont about
>microswitches is well taken, tho I personally have had no trouble. But
>when I have a moment I'll set up a test jig using a micrometer spindle,
>see what I find, and let you know. I think some of the variability might
>be due to slop in the mounting. Anway, I'll try various things (e.g.
>putting a microswitch having only a small plastic acuator usually driven
>by a spring lever in a 0-1" mic and see what happens. I think the dvice
>from MAXNC is just a set of mechanichal contacts, and if so perhaps I
>could make a simple prototype. I have had one in mind using an opto
>interrupter, and if that proves twichy, I did when a young impoverished
>student make a mechanical test gage with a gain of about 30 that let me
>center work in a 4 jaw chuck to better than .001 inches. That with an
>ordinary optical interrupter might come close to .0001 in. There is
>somewhere in my library a design for such a lever device. I'll see iv I
>can find it. Somebody who might be interested is Guy Lautard who lives
>not far from Vancouver. Ahh, I've found him <[EMAIL PROTECTED]> I
>think. If I'm wrong, and find out, I'll tell you who you should e-mail to.
> Sincerely
> John Gabriel
I've had decent luck centering work with a mini dial indicator whose major
divisions are about 1/8" apart and represent .001". Got it from grizzly
during a fire sale some time back. This is the one with the little bitty
lever that moves sideways at the tip rather than as a plunger. I can get
those, for a price, good down into the micron range, and used to do helical
scan tape recorder head setups with them.
For my project, I collected everything but the opto interrupter while I was in
town today, and that I'll have to get from digikey. So I'm off and running I
think.
--
Cheers John, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Man is the best computer we can put aboard a spacecraft ... and the
only one that can be mass produced with unskilled labor.
-- Wernher von Braun
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