Question about pots and matching knobs

Discussion in 'The Projects Forum' started by phase ghost, Mar 15, 2010.

  1. phase ghost

    Thread Starter New Member

    Mar 3, 2010
    14
    0
    I'm on the digikey website trying to buy some potentiometers and knobs. I've picked out the knobs I like, but there doesn't seem to be any pots that match the size.

    The knobs are sized at 6.38mm, but closest size I can find is 6.35 for a linear rotary pot. In fact, 6.38mm isn't even a sort option for any of the pots. So, am I out of luck? It would be a shame because they are just the knobs I want. The company that makes them is Tyco.

    I checked out the encoders and they don't have a 6.38 either. Would a 6.38mm knob work with a 6.35mm pot? My first thought is no, but maybe someone else has run into this situation. Thanks!
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The fit of the knob is possible because the internal diameter of the sleeve is .03mm greater than the OD of the shaft, meaning there is room for the knob to fit over the shaft. The knob if actually held in place by one or two set screws, not by friction.
     
  3. phase ghost

    Thread Starter New Member

    Mar 3, 2010
    14
    0
    Oh, I didn't realize they were held on by set screws. Thanks beenthere!
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The only friction fit knobs are ones with a half flat (D shaft) or with ribs.
     
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