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Please help can someone please help figure out how this type of thread called?

By osher on 14 Apr 07:55 3 answers 2 comments

Hello all,
Does anybody know the mechanical name for this type of thread closure?
Does anybody has any tips on making one?
Thanks a lot from advance to all,
Osher,

Added images

Square

3 answers

  • FredSWUG
    FredSWUG over 1 year ago

    I don't think you'll find any charts, tables, or references for a feature like that. It is really custom made for the application. What fits, how secure, how much rotation, how much force, friction fit vs. detents.... There are a hundred variables to account for, and it won't be the same on a second device.

    As a starting point, maybe try a regular thread. You can always extend the thread profile to stick way out like it does in the image. You'd have to experiment a bit with the pitch, but once you had one "fin" made, it would be easy to pattern the remainder.

    The overall appearance is similar to a triple start or triple lead thread: http://www.mmsonline.com/columns/dealing-with-multiple-start-threads-on-turning-centers

  • FredSWUG
    FredSWUG over 1 year ago

    What did you find it on?
    I don't think it is an actual "thread" as in you'll find a table listing its major and minor diameters along with pitch and clearances. It looks more like a "thread like" feature to create a twist lock mechanism.

    The best option might be to reverse engineer it with calipers, and some photos. Laser scanning can help. but seems a little overboard for this application.

  • carl malia
    carl malia over 1 year ago

    this looks like it is not a standard thread so i would be surprised if there are any thread specs anywhere, this will have been a one off as it is just for locking and is not a full thread.

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