Thread form parameter in thread xml

[wib002]

I would like to know what <ThreadForm>7</ThreadForm> means in the header of a thread.xml file please?

Many thanks in advance,

Louis

[etfrench]

What is the actual file name and location?

[HughesTooling]

This article used to have information on thread types but looks like it's been edited and the useful info removed!

But I found this in an old thread on the forum. Edit After @MRWakefield  post I updated the Whitworth form to 8.

1. go to thread data folder--> [Fusion install path]\Fusion\Server\Fusion\Configuration\ThreadData

2. make a copy of the thread family that you want to customize, for instance: "ACMEScrewThreads.xml" copy to "MyThread.xml"

3. open the "MyThread.xml", change the "<Name>ACME Screw Threads</Name>" to "<Name>My Customize Threads</Name>"(any name is ok, just make sure it is unique)

4. define thread shape for your customize thread: add "<ThreadForm>0</ThreadForm>" under the <ThreadType>, 

        0----trapezoid; 1----sharp; 5----square; 8-----whitworth

     if you don't add this, default shape is trapezoid

5. now you can customize anything, including the pitch/diameters...

Please note:

•  If you create a thread by your customize file, and save the f3d document, and open it on other machine, when other people try edit the thread, he will get an error message "...the current thread family has no suitable type..."
• If you directly change a standard thread type, and create a thread save to f3d document, when other people open it on their machine, recompue or edit the thread will get back to standard shape.

[MRWakefield · Accepted solution]

I'd like to add to what @HughesTooling said and say that the Whitworth value of 7 doesn't seem to work any more. Instead you have to use a value of 8.

[HughesTooling]

@MRWakefield Thanks, I updated my last post so it doesn't cause confusion if referenced in the future.

[etfrench]

Has ThreadForm been deprecated?  It doesn't seem to exist in any current files.

[MRWakefield]

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@etfrench wrote:

Has ThreadForm been deprecated?  It doesn't seem to exist in any current files.

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AFAIK it's always been missing. I seem to remember a discussion somewhere in the forum a while ago regarding this. It appears that for some unknown reason the thread forms of the standard Fusion-supplied thread files are hard-coded into Fusion. I can't imagine the tag being deprecated if they're going to continue to support user-defined threads. If you play around with a thread file and enter a ThreadForm  value of '8' you will notice that a radius is added to the crest and the root of the thread (a-la Whitworth). Similarly if you enter a value of '5' you get a square thread.

[HughesTooling]

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@etfrench wrote:

Has ThreadForm been deprecated?  It doesn't seem to exist in any current files.

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It seems like it's hard coded into the default XML files. In the past there have been bugs that stop custom XML files creating the correct profile but the default files worked correctly.

Mark

[MRWakefield]

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@HughesTooling wrote:

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@etfrench wrote:

Has ThreadForm been deprecated?  It doesn't seem to exist in any current files.

---

... In the past there have been bugs that stop custom XML files creating the correct profile but the default files worked correctly.

Mark

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Yes, I noticed some issues with a BSW/BSF thread file recently. The figures are correct but I get an error if I select 'Modeled' for some sizes (anything under 2" for example). I've attached the file in case you're interested.

[wib002]

It was in a custom thread xml file - for ME threads. File start below:



7
ME Screw Threads 32 TPI
ME Screw Threads 32 TPI
in
55
1

0.250

ME 1/4"
ME 1/4"

[wib002]

Awesome thanks Mark

[wib002]

First line of a custom thread file (ME - identical form to BSW)

[MRWakefield]

I've tried to set up a forum thread as a repository for custom thread files so if you wouldn't mind sharing your Model Engineer's thread could you add it to the thread here?

Thanks.

[HughesTooling · Accepted solution]

There is a thread on the forum fo ME threads. Attached copy of the XML for 32 and 40 TPI. Don't know if it still works, I notice the thread form is 7 so might need changing?

[MRWakefield · Accepted solution]

Thanks @HughesTooling I'll change the ThreadForm value and upload it to the other forum thread.

[rrodriguezF5XQ6]

Has anyone else noticed Modeled threads now have radii in the thread form?  Can this be changed?

[MRWakefield]

Which thread standards are you noticing have radiuses? Certain threads such as those based on the Whitworth form and BA threads should have radiuses whereas metric and UN threads for example don't. If you want to have threads without radiuses you'll need to edit the xml thread files accordingly by setting the ThreadForm tag to a value of '0' (Trapezoidal).

[etfrench]

[rrodriguezF5XQ6]

Here is My internal Thread.  When I modeled this a couple of weeks ago the threads look like the picture you provided.

The I opened my drawing I noticed some of the dimensions were dis-associated.  So I looked at the model to find the radii.

[etfrench]

Which thread?