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www.thingiverse.com
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1.0.0
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PacManFan
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https://spdx.org/licenses/CC-BY-SA-4.0
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This is a small 200m test print of some threaded rod I made along with a matching nut. It is a double helix with 1 turn per 50mm. The math works out like this: For a standard 200 step/ rev stepper motor 50mm / 200 step = .25mm per step add in a 2:1 gearing or half step motor controller and you have .125 mm/step add both and it's .0625 mm/step From what i can tell, there is no perceptible backlash and the nut slides very freely. I'm sure I'm going to incorporate this into my shuttle system or a printer somehow. Enjoy... Edit: As per request, Here's a video of it: http://www.youtube.com/watch?v=Hkjf8x__SrE The video shows that it's loose enough to slip down on it's own. I would recommend printing one to test tolerances for yourself. Edit 6/18/2011 Uploaded the quad helical nut/thread. This should help with any wear issues, as well as addressing any concerns with backlash.
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en
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thingiverse.com
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