Yet another Thread thread - UTS Implementation

I just wanted to post a a little helper file for creating internal and external threads based on the Unified Thread Standard (UTS) which covers both English and Metric.

I must give high kudos' to Wikipedia. I borrowed their images and tables for the attached Creo 2.0 full version parametric file. You will also find a linked link in the site if you turn on annotation.

See the relations to drive the pitch and diameter you are interested in. The file is set up for English but you can change it to metric units, if that is your primary usage. Most everything that can be driven by relations has been. Only 3 variables are needed... and TPI (thread per inch) is set to zero if you want to define the pitch directly for metric threads. See the "IF" statement in Relations.

I did have some troubles along the way. I split up the helical sweep because it -did- fail if I did it in one go although it did not overlap anywhere. This was customer support's "works as expected" Pro|WorkAround© for helical sweeps that fail otherwise. This made the file more robust for changing threads on the fly through relations.

Of course, I suggest you make a library part of the two sketches in the file and use them liberally. Otherwise, the file is a nice quick reference for many thread features. And if you link into Wikipedia, you will find even more excellent information about this standard.

http://en.wikipedia.org/wiki/Unified_Thread_Standard

http://en.wikipedia.org/wiki/ISO_metric_screw_thread

Here are some of the highlight images from the file... turn off planes and CS' and turn on Annotation, Axes, and Points.

The images should be saved in the file so no external reference issues should exist.