Astro-threads for Fusion 360

[rwillett]

Just printed a 42mmx0.75mm to see if it worked and it was great. No issues threading on an extension tube.

This was printed on a Prusa MKS3+ at 0.05mm and 100%. Not sure if thats the best to use, it took 102 mins to do a 5mm ring BUT it worked first time. My older Ender 3 would never get that accurate.

Rob

[Jack Wells]

This thread is absolutely fantastic. Im looking for some help in finding out the correct sums for a M770.75 pitch thread. 

After using that great calculator - http://www.iso-gewinde.at/ Im still not getting it, Also no idea on how to find the thread tap value. 

Any help would be greatly appreciated. This is what i have incorrectly so far;

 

<ThreadSize>
    <Size>77</Size>
    <Designation>
      <ThreadDesignation>M77x0.75</ThreadDesignation>
      <CTD>M77x0.75</CTD>
      <Pitch>0.75</Pitch>
      <Thread>
        <Gender>external</Gender>
        <Class>6g</Class>
        <MajorDia>76.908</MajorDia>
        <PitchDia>76.432</PitchDia>
        <MinorDia>475.9845</MinorDia>
      </Thread>
      <Thread>
        <Gender>internal</Gender>
        <Class>6H</Class>
        <MajorDia>77</MajorDia>
        <PitchDia>76.593</PitchDia>
        <MinorDia>76.283</MinorDia>
        <TapDrill>47.25</TapDrill>
      </Thread>
      <Thread>
        <Gender>external</Gender>
        <Class>4g6g</Class>
        <MajorDia>76.933</MajorDia>
        <PitchDia>76.4535</PitchDia>
        <MinorDia>76.506</MinorDia>
      </Thread>
    </Designation>
	</ThreadSize>

 

 

[chemistorge]

just to add my experience: I have printed threads, 1.25", 2" and M42. In my experience internal threads tend to shrink a little making them tight. To alleviate this I created an 8G tolerance for internal threads to account for this.  

I also print if possible with the threads around the z-axis with a 0.1 mm layer height.

 

I have included  my fusion 360 thread file with 8G tolerances

Astronomy Fusion 360 Custom Threads.xml

[Thalestris24]

On 20/08/2022 at 13:41, chemistorge said:

just to add my experience: I have printed threads, 1.25", 2" and M42. In my experience internal threads tend to shrink a little making them tight. To alleviate this I created an 8G tolerance for internal threads to account for this.  

I also print if possible with the threads around the z-axis with a 0.1 mm layer height.

 

I have included  my fusion 360 thread file with 8G tolerances

Astronomy Fusion 360 Custom Threads.xml 293.21 kB · 6 downloads

Hi

I was interested to see what values you've used for the astro threads but have not managed to read your .xml It throws up an error in Edge and the downloaded file isn't easily readable in Notepad++ which I normally use for xml files like the AstroISOmetric one. Any ideas?

Thanks

Louise

[DaveL59]

2 hours ago, Thalestris24 said:

Hi

I was interested to see what values you've used for the astro threads but have not managed to read your .xml It throws up an error in Edge and the downloaded file isn't easily readable in Notepad++ which I normally use for xml files like the AstroISOmetric one. Any ideas?

Thanks

Louise

opens ok in LibreOffice 5 Calc, perhaps try that?

[chemistorge]

5 hours ago, Thalestris24 said:

Hi

I was interested to see what values you've used for the astro threads but have not managed to read your .xml It throws up an error in Edge and the downloaded file isn't easily readable in Notepad++ which I normally use for xml files like the AstroISOmetric one. Any ideas?

Thanks

Louise

Hi Sorry, I attached the github html download not the correct xml file.

 

Here is the correct XML file.AstroThreads.xml

[Thalestris24]

1 minute ago, chemistorge said:

Hi Sorry, I attached the github html download not the correct xml file.

 

Here is the correct XML file.AstroThreads.xml

Ah - that would explain it! I find I have to put in my own custom values in order to get T2 threads to work on my Ender 3 Pro v1. I'll compare my values to yours!

Thanks

Louise

[AstroAdam]

Okay, so been a while since the last post, but wanted to say thanks so much for this.  Made making an M42 and M48 1.25" filter holder an absolute breeze 😁.