topic Re: Mirror a threading tool path creates a left hand thread in Fusion Support Forum

Mirror a threading tool path creates a left hand thread

Matt1911 — Fri, 17 Nov 2023 00:16:02 GMT

We are making a part on a 5 axis, that has a female pipe thread on both sides. We mirrored the tool paths from one side to the other. I got the entire assembly together and went to put in a pipe plug to pressure test, and the one side has left hand pipe threads. Took me a minute to figure out why one side went in and the other just wouldn't start.

Re: Mirror a threading tool path creates a left hand thread

davebYYPCU — Fri, 17 Nov 2023 00:34:57 GMT

Mirror did what you asked for,

Rectangle Pattern will do what you need.

Might help....

Re: Mirror a threading tool path creates a left hand thread

Matt1911 — Fri, 17 Nov 2023 01:52:30 GMT

Linear\ rectangle pattern wouldn't work, but Circular Pattern did it. Still seems dumb to exactly mirror a thread tool path

Re: Mirror a threading tool path creates a left hand thread

davebYYPCU — Fri, 17 Nov 2023 04:08:41 GMT

What will a guy wanting / needing a left-handed thread (there) be thinking about now?

How come it's right-handed?

Re: Mirror a threading tool path creates a left hand thread

aleksei_ovsienko — Tue, 23 Sep 2025 09:09:53 GMT

I still think mirroring threads looks more like a bug than feature. I was just checking my colleagues drawing and the moment I saw that LH on the callout I knew what happened. He mirrored a tapped hole and put an automatic callout in.
In other CAD systems you can mirror a tapped hole without the thread becoming left handed. People just expect it to work like that.