Connect with us

Alco- I wonder what's the story here

Discussion in 'Electronic Design' started by Spehro Pefhany, Jul 25, 2013.

Scroll to continue with content
  1. Syd Rumpo

    Syd Rumpo Guest

    That's quite common - you drill a small hole next to the mounting hole
    and the tab on special washer sits in the small hole preventing switch

    Save drilling a D-shaped hole.

  2. Baron

    Baron Guest

    Syd Rumpo Inscribed thus:
    But the flat doesn't go all the way to the top of the threads !
  3. Whilst your suggested arrangement might look nice in a Solidworks 3D
    assembly model, with no interference or other obvious problems, I'm at
    a bit of a loss as to how one would go from the parts as shown to the
    assembly in real life.
  4. Baron

    Baron Guest

    Spehro Pefhany Inscribed thus:
    Without the flat continuing to the top of the threads you couldn't
    assemble the anti rotation washers.
  5. Syd Rumpo

    Syd Rumpo Guest

  6. John S

    John S Guest

    Below the Digikey image you reference is the note:

    "Image shown is a representation only. Exact specifications should be
    obtained from the product data sheet."

    If you access the mechanical drawings and data sheet, available on the
    same Digikey page, you will see the actual situation.

    John S
  7. Bzzzt. Nope.

    The bushing drawing is incomplete (only shows the thread and length)

    The part drawing shows a slot (not visible in the photo) but no flats

    The actual part wot I have on my desk looks like this:

    The anti-rotation washer does not look like the one in the photo, it
    actually works.

    Can anyone come up with a remotely plausible explanation (other than
    the obvious one of a face-palm screw-up) of why those partial flats
    are on there?
  8. Guest

    Maybe for a post-install U-thingy, with the top threads left full to
    make the double-nut assembly stronger.
  9. Joerg

    Joerg Guest

  10. That's the best I could come up with-- then I saw the Digikey photo of
    the washer and the penny^H^H^^H nickel dropped.
  11. Darn, and my tricorder needs a fresh set of AA's.
  12. is there a flat on both sides or just one?

  13. josephkk

    josephkk Guest

    OK so far. Seen that before. Now how do you get the washer on?

  14. josephkk

    josephkk Guest

    With a clear and reliable photo i am beginning to wonder if i missed
    something. I think i see a way to assemble it in a real panel, but it is
    really going to bite if it is soldered to a PCB. Most especially if not
    at the edge.

  15. I think some people might be confused. You are asking why they machined part of the thread away. (And not about flat on the thicker part of the bushing that fits the D shaped washer.) (Or I'm confused.)
    So maybe they touch down with the mill on the threads to 'find' the depth and then mill the D in the bushing.
    That's my only guess.

    George H.
  16. Ahh, never mind... I'm confused.. nothing new.

    George h.
  17. Robert Baer

    Robert Baer Guest

    That partial machining (for the "D") makes it impossible to use the
    alignment/locking washer.
    Someone really F'ed up and other idiots did not catch the problem,
    including the photographer.
  18. Robert Baer

    Robert Baer Guest

    Will not work when that washer is useless..
  19. Robert Baer

    Robert Baer Guest

Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day