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renderedchild

Mechanical
Sep 10, 2008
8
OK, I'll start this off with an apology, as I know this is a basic issue. I will also state that I have searched, both here and google with no real success. I suspect I can find the answer in the machinery handbook, however, I am off site and cannot get to one easily. (Is there an online version?)

I am currently working on a design where 2 pieces will thread together. Because of packaging restrictions the threads will have to be "custom". I've decided on 3.125" X 12 TPI X .75" deep thread. Now my questions:

How do I design the tolerance between the male and female threads? Once the tolerance between the two is figured out, how do i notate that on a drawing?

I assume I can't just point to the male thread with a 3.125-12 - 2A dimension and 3.125-12 - 2B on the female and expect the machinist to get the clearances right so everything fits. Surely it is more complicated than that.

Like I said, I've done searches here and on google with no real results. I suspect what I'm asking is pretty much common knowledge, plus I'm sure i'm not using the best search terms. So sorry for that. This is my first design with "custom" threads, obviously, so any links on the subject are appreciated.

Thanks in advance!
 
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