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  1. #21
    Donald Qualls's Avatar
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    Jan 2005
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    North Carolina, USA (transplanted from Seattle)
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    Quote Originally Posted by claytume
    Donald..........never seen or heard of these.........anywhere on the net I can see one?
    They're the simplest form of CNC for a lathe -- look at threading setups for Taig or Sherline lathes, neither of which have change gears available to do traditional thread cutting. In their simplest form, they use an optical encoder on the spindle, and each spindle pulse is converted to some set number of lead screw stepper steps, giving a set amount of advance per revolution. Using an encoding wheel with enough teeth, combined with the response time and inertia of the stepper system, gives smooth motion.

    Start here.
    Photography has always fascinated me -- as a child, simply for the magic of capturing an image onto glossy paper with a little box, but as an adult because of the unique juxtaposition of science and art -- the physics of optics, the mechanics of the camera, the chemistry of film and developer, alongside the art in seeing, composing, exposing, processing and printing.

  2. #22

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    Dec 2004
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    I'm having a similar part made at a local machine shop here in Baltimore, since Bencher doesn't supply them in that size any longer. My local guy says $40 or so. I should get it back shortly. Then I can use my 8x10...

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