Custom Thread Definitions in Autodesk Fusion 360 – PG Conduit Threads
I recently found the first shortcoming of Autodesk’s Fusion 360, it doesn’t have thread definitions for PG conduit threads! If you have no idea what PG conduit threads are, you’re probably not alone, they are a legacy thread definition that’s only used for cable glands in Europe these days (and some types of sensors in the chemical industry, or so Wikipedia tells me). PG stands for Panzergewinde which with my German roughly translates to something like “armoured thread”. As I said, it’s pretty legacy, but at least here in Finland you have basically a 50/50 chance of finding a cable gland in either PG threading or metric.
So I had to do something about this, as I happened to have some nice stainless cable glands in my parts bin with a PG 13,5 thread, and I wanted use them for a 3D printed PSU cover I’m working on.
Luckily, Autodesk Fusion 360 comes with the option of adding your own thread sizes to it fairly easily. I won’t go into detail on how they are defined, but it’s basically a huge XML file for each thread family, with an entry for every diameter and pitch. PG sizes are fairly easy to define, as there are only a handful of sizes available, and only one for each specific diameter.
I’ve made up a file for PG sizes, which you are free to use as you see fit. I’ve defined all internal threads with their maximum allowable size, and all external threads with their minimal allowable size, for maximum tolerance, and as we’re talking about a thread used mainly for plastic-on-plastic or metal-on-plastic, with a pretty blunt thread form (80 degrees instead of the ISO metric 60 degrees), I’m fairly certain it’s all fine and good. If you like something else, it’s fairly trivial to change the XML file to suite your needs.
The XML file is zipped to keep WordPress happy, just unzip it and place the XML file in the following directory
Autodesk uses this fairly complicated folder structure for Fusion 360, so for more instructions on how to work with custom thread definitions, please visit the Autodesk Knowledge Network page about the topic.