Formula : Threaded Holes on both the plates
Formula : Threaded Holes on both the plates
(OP)
Hi,
Appendix B of 2009 std explains the formula for Fixed and Floating fasteners.
For some reason if I want tapped holes on both the plates. How to calculate the positional tolerance for such cases?
Can anyone help please me on this.
Appendix B of 2009 std explains the formula for Fixed and Floating fasteners.
For some reason if I want tapped holes on both the plates. How to calculate the positional tolerance for such cases?
Can anyone help please me on this.





RE: Formula : Threaded Holes on both the plates
Please explain the situation in more detail in case I'm misunderstanding you.
http://www.eng-tips.com/viewthread.cfm?qid=255441 may be vaguely relevant. What my lengthy 29 Sep 09 10:41 post overlooks is the effect of the angle tolerance on countersink head an hole - my proposed counter sink dia may still not always work.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Formula : Threaded Holes on both the plates
How do you fix something with two tapped holes? You need the threads of both pieces located accurately to a common helix. The only easy way to do this is to assemble and then tap.
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JHG
RE: Formula : Threaded Holes on both the plates
The only situation I could think of it if the threaded shaft going between them is not meant to fasten, but there are very few situations I can think of where that would exist. Even where it exists, it seems like the plates would have to be able to move/flex away/toward each other to suit the thread helix, which would be strange to allow.
A very unusual requirement, I'd say... one worth avoiding at all costs as far as I can imagine.
@Madhu54, maybe you could sate my curiosity as to why you're looking into this, since I'm not the only one left wondering.
RE: Formula : Threaded Holes on both the plates
I joined two aluminum sheet parts by clamping, match-drilling, match-tapping, and then screwing in an aluminum Pem-stud and trimming it on both sides. ... then peening the trimmed ends of the pem-stud into the small countersinks I had left on the drilled holes. When complete, it was ~flush on both faces, and looked a bit like a spot weld.
Too labor intensive for production, of course.
Mike Halloran
Pembroke Pines, FL, USA