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Does this fastener exist?

  1. Oct 31, 2015 #1
    Hi there,

    I'm looking for a specific type of fastener of which I don't know actually exists. I'm hoping someone here will be able to point me in a direction or give other advice.

    In the simplest terms, I'm attempting to mount a rod and mass such that it can rotate on an encoder shaft. However, I don't what would be the best/most lightweight method for doing this.

    Referring to the image (here - http://imgur.com/6YBB4S2), i'm hoping that there exists a device that has a hole with set screw such that it can be fastened to the rod. And then I also wish for this device to have a thread hole such that the rod can be fastened to it. Refer to the assembly in the lower part of the diagram.

    Does such a device exist? Are there easier methods for doing this? I'm looking for a light weight solution.

    Thanks!
     
  2. jcsd
  3. Oct 31, 2015 #2

    Nidum

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    Meccano was the traditional source for oddities like this . Still lots of it for sale new and second hand :

    http://www.meccano.com/

    https://www.google.co.uk/search?q=m...ved=0CAgQ_AUoAmoVChMIp_mf74_tyAIVA-wUCh1UOQmI

    And Fischer Technik :

    http://www.fischertechnik.de/en/Home/products.aspx

    Other technical toy kits also often have many useful parts for experimenting .

    If it was me though I would just make one . Rough and ready version in ten minutes . Fully machined accurate version in 20 minutes .
     
  4. Oct 31, 2015 #3

    Nidum

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  5. Oct 31, 2015 #4

    David Lewis

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    A collar with two threaded holes might work (one hole for the setscrew, and one hole for the threaded rod). If the collar slips, a flat could be machined on the encoder shaft.
     
  6. Oct 31, 2015 #5

    berkeman

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    Looks like you could just make your own using some thick PVC pipe with the right ID. Drilling and tapping plastic is easy...
     
  7. Oct 31, 2015 #6

    CWatters

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    Perhaps just drill a hole through the potentiometer shaft. Put a threaded rod through the hole with a nut either side.
     
  8. Oct 31, 2015 #7

    rbelli1

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    How do you plan on supporting the shaft of the encoder? They are not usually designed for load bearing.

    BoB
     
  9. Oct 31, 2015 #8
    Hi there rbell1,

    The diagram I drew is not completely accurate in describing my design. I have a bearing that will support the load such that the force due the load will not hurt the encoder.
     
  10. Oct 31, 2015 #9

    berkeman

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    It would take two sets of bearing races to support the load, no?
     
  11. Oct 31, 2015 #10

    berkeman

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  12. Nov 1, 2015 #11

    Ranger Mike

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