Thread class not showing (but shows in threads xml)

[877cms]

I'm making a covers for a M16 threaded bar, class 6H shows which I believe is a more snug fit than class 6G.

When I examine the xml found below, it does show the 6G class (looser fit).

Any idea why it's not showing?

C:\Users\USERNAME\AppData\Local\Autodesk\webdeploy\production\30c9d5533837458c62c42054f4d8a9dcee4200a0\Fusion\Server\Fusion\Configuration\ThreadData\ISOMetricprofile.xml

 

[MRWakefield · Accepted solution]

I expect it's because the 6g class that you see in the XML is for external threads only (upper case = internal, lower case = external). There appears to be only 6H available for internal threads in the Fusion thread file. If you need more designations you'll have to create a custom thread file. BTW, you'll probably want a 7H class for a looser fit.

Hope this helps.

EDIT:

Alternatively you could offset the thread to make it larger/smaller. Here's a link to a post I made showing how to do this properly.

[877cms]

That’s great info thank you. I didn’t think about making a custom file. I guess I can just copy the ISO metric file to a new name and edit what I need. Good tip about using 7H thank you 🙂

[MRWakefield]

You're welcome. Yes, you can copy the standard ISO Metric file and edit accordingly. Be aware though, that going up to 7H might not be enough to give you the fit you're looking if you're 3D printing the part. You can go up to 8G but that still might not give you enough. I'd probably offset the thread and use a parameter for the offset value. It's then a simple case of adjusting the parameter value until you get the fit you're looking for.

Hope this helps.

[877cms]

Offsetting sounds like a good idea, I have had a look and am not sure how to do that seemingly simple task! Maybe the way I created the thread....

Could I trouble you a bit more? 🙂

My design attached.

[MRWakefield]

If you take a look at the "Offsetting threads for 3D Printing" post I linked to it should all become clear. You might have to read through it a few times before it finally makes sense.

I've added a parameter called "Thread_Offset" and used that in an "offset face" feature.

Note that a negative value will remove, and a positive value will add material .

I've given it an arbitrary value of -0.2, adjust accordingly until you get the fit you want.

Hope this helps.

[877cms]

That's really helpful - thanks for all your help! 👍

[MRWakefield]

No problem, you're welcome. Don't hesitate to shout if you need any further help.