Looking for articles discussing angle axis differences between holes and screws

[cktopher]

Looking for articles discussing angle axis differences between threaded holes and screws.
Are there errors between the screw axis and axis of the threaded hole that the screw goes into?

[jboggs]

In a perfect world, no. A perfect screw will be perfectly positioned by a perfect thread. So, its simple - make them both perfect!
Seriously, in the real world there are manufacturing imperfections and clearances involved. The final position of a screw in a threaded hole is affected by many factors so the best you can say is that it is "close". That's why it is NEVER a good idea to try to use screw threads for any kind of precise positioning or alignment.

[Kelly_Bramble]

In a perfect world, no. A perfect screw will be perfectly positioned by a perfect thread. So, its simple - make them both perfect!
Seriously, in the real world there are manufacturing imperfections and clearances involved. The final position of a screw in a threaded hole is affected by many factors so the best you can say is that it is "close". That's why it is NEVER a good idea to try to use screw threads for any kind of precise positioning or alignment.

Good post...

Also, to compare thread features, see:

External Thread Size, tolerances and Geometry

Internal Thread Size, tolerances and Geometry

[cktopher]

Thank you,