Creating a custom thread M42* 0.75 pitch - thread profile have dissapeared

[Anonymous]

Hi fellow fusioners.

I am trying to create an adapter for an CCD astronomy camera. It has to have a M42*0.75 thread. I cannot find any specifications online.  I found the specifications for m33 *0.75 and used them. Is this a suitable solution?

I have created the the XML file in the correct directory as follows:

<?xml version="1.0" encoding="UTF-8"?>
<ThreadType>
<Name>Astro Filter</Name>
<CustomName>Astro Filter</CustomName>
<Unit>mm</Unit>
<Angle>60</Angle>
<ThreadSize>
<Size>42</Size>
<Designation>
<ThreadDesignation>M42x0.75</ThreadDesignation>
<CTD>M42x0.75</CTD>
<Pitch>0.75</Pitch>
<Thread>
<Gender>external</Gender>
<Class>4g6g</Class>
<MajorDia>41.908</MajorDia>
<PitchDia>41.4595</PitchDia>
<MinorDia>41.066</MinorDia>
</Thread>
<Thread>
<Gender>internal</Gender>
<Class>6h</Class>
<MajorDia>41.283</MajorDia>
<PitchDia>41.588</PitchDia>
<MinorDia>42.129</MinorDia>
<TapDrill>41.25</TapDrill>
</Thread>
</Designation>
</ThreadSize>
</ThreadType>

However fusion crashes so I know something is wrong. All I really nead is the internal dimension.

Thanks

[MRWakefield]

There's no need for a custom thread file as these are already included with F360.

[kpgrafix]

Ah yes... had to dig more and found this moments after my post. Thank you.

[kpgrafix]

Is there a way to adjust tolerance of these presets for use in 3d printing? Cheers!

[MRWakefield]

Yes, you can decrease the external sizes and increase the internal sizes to suit your printer by editing the XML files. To do this manually for one or two sizes isn't too much work but if you wanted to do a complete thread series it would be very laborious!

To make life easier I developed a Windows application for creating custom Fusion threads, this has a function to add or subtract a set amount from the Major, Minor and Pitch diameters (mainly intended for 3D printing of threads). You can find a post with some info and a download link here.

Hope this helps.

[kpgrafix]

Is there any profile for metric self tap/course thread screws? Cheers

[MRWakefield]

After a very quick Google I found this page:

https://international.optimas.com/technical-resources/self-tapping-screws-thread-dimensions/

At first glance I think it gives you enough information to create a thread file but you might find more detailed info with a bit more research. I'll continue having a look around and if I find anything more I'll post back.

Hope this helps.

EDIT: Here's a calculator: https://amesweb.info/Screws/Self-Tapping-Screw-Thread-Dimensions-Metric.aspx

[MRWakefield]

Ok, on further investigation it looks like Fusion already includes Metric self-tapping screw threads (I was sure I'd seen them in there before!!). The one I think you want is called "GOST Self-tapping Screw Thread" which uses the ISO 1478 thread mentioned above.

[MRWakefield]

Where did you go @kpgrafix ? Was this what you were looking for?

[awgs_warlord]

Installing new threads?  So very much a novice, I created a thread adaptor, and like many, was unsure how to get M52x1 and M55x1, I can't work out how to do this, and I have downloaded the XML, does this import into Fusion?  or is there a file I use to do this?

Any help would be massively appreciated as I printed my adaptor as 1.5 just to see a result.

Without experts on here, most things are out of reach for novice designers like me 

Many Thanks

Nick

[MRWakefield]

The xml file just needs to be copied to a specific folder. Unfortunately this folder changes whenever Fusion is updated, resulting in you losing your custom thread(s) from the list. To fix this I always recommend the ThreadKeeper add-in. This will copy all of your custom thread files to the correct folder whenever Fusion receives an update.

Hope this helps.

[georgmierau]

Thank you very much for your custom threads!