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Knobs for rotary encoders

Discussion in 'Electronic Design' started by Fred Bartoli, Feb 10, 2007.

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  1. Fred Bartoli

    Fred Bartoli Guest

    I'm in quest for 30-35mm diameter, 10-12mm height, ivory or light gray
    knobs of the kind used on instrument using rotary encoders. Couldn't
    find anything yet.

    Any ideas?
  2. The machine shop. :)
  3. Fred Bartoli

    Fred Bartoli Guest

  4. To go with your stock of encoders? They're not weighted, are they?
  5. Eeyore

    Eeyore Guest

    Sifam ?

  6. I've got quite a few 32mm diameter ~15mm high black anodize encoder
    knobs with metal (aluminum) knurled shell over plastic (for 6mm metric
    D-shaft push-on). Maybe you could paint them. ;-)

    Best regards,
    Spehro Pefhany
  7. Fred Bartoli

    Fred Bartoli Guest

    Fred Bartoli a écrit :
    Finally mouser had the clue.

    Keywords are : knob + finger or fingertip + spinner.

    Lots of good hits, first of which is
  8. John  Larkin

    John Larkin Guest

    This uses a Rogan PT-5, costs $1.17.

    We did a lot of testing and decided that a smaller knob is easier to
    use. You can "twirl" it between your fingers and get a lot faster
    spin, when you need it, than you can with a bigger official-spinner

  9. The flat type with a finger depression might be better, but they are
    hard to find. Otherwise, I think ~15mm is better. What size is that
    one? Is it collet type?

    Best regards,
    Spehro Pefhany
  10. John  Larkin

    John Larkin Guest

    This one is 19 mm at the base, tapered a bit, brass insert with
    setscrew. It's a little rubbery feeling, nice to grab and spin while
    you're looking at something else, like a scope screen. We tested some
    of the things with the finger depression and found them fairly awkward
    to use... to spin them very far, you wind up swiping them along the
    side of the knob a bunch of times, rather then trying to spin the
    slippery depression, which challenges my manual dexterity. Not to
    mention expensive. Well, OK, I mentioned it.

    15 mm would probably work even better, but it's starting to look less

  11. john jardine

    john jardine Guest

    "Fred Bartoli"
    Big knobs were a problem, so I cast a few in gleaming white Polyester resin.
  12. Eeyore

    Eeyore Guest

    You're absolutely right. I've found exactly the same myself. Big knobs with
    fancy caps may look cool but are relatively clumsy to use.

  13. Eeyore

    Eeyore Guest

    They look cute but aren't very nice to use IMHO.

  14. In 1984 I visited the cockpit of a 747 over Greece. The pilot had
    maps out to show me, and as we passed a waypoint, he reached up
    to a knob to dial in a new bearing. Twiddle until the mechanical
    3-digit display had the right number, and a 300+ tonne plane made
    a coordinated turn to the new bearing. Said knob was barely bigger
    than a pencil eraser...I was suitably impressed!

    Clifford Heath.
  15. Guest

    You might check with Mouser about pricing on their web site. Last week
    I was look at re-ordering a knob from that series that I had paid $6 a
    year before. The web site showing around $13 and when I enquired how
    the price could increase so much they said it was an error, the actual
    price was around $7.
  16. The attraction from my perspective as an instrument designer is that
    they can be made relatively flat (sunk flush with a panel, even) and
    thus can be made fairly difficult for Joe Numbnuts user to snap off.

    Best regards,
    Spehro Pefhany
  17. Ken Moffett

    Ken Moffett Guest

    I think also, at one time with multil-turn pots, the large
    finger-spin knobs were to let you spin through the full range
    quickly, yet have fine control (longer lever arm ratio knob-
    to-wiper) once you got near your "tweak" point. Or is the an
    obvious "given". :)

  18. Guest

    Selco products.
  19. Winfield Hill asked:
  20. Oops, missed the original. No, they're not weighted (I measure 11 or
    12g), the aluminum is just for the (literally) cool feel and the
    relatively sharp knurls (too sharp to be injection molded) and the
    machined finish. Yes, they fit the encoders.

    Enjoying the cool weather:

    Best regards,
    Spehro Pefhany
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