Thread Maker v4.1

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Workshop_Notes
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Re: Thread Maker v4.1

Post by Workshop_Notes »

KurtF wrote: Sun May 22, 2022 9:21 pm I hadn't thought of that, specify taper ratio instead of taper angle. Is this what thread-using engineer types will find most intuitive?

What's a PG? And a BA?
Broadly speaking, it is unusual for tapered stuff to be specified in terms of angle. As most of this stuff was first produced on a lathe with two perpendicular axes of movement, it is much easier to specify tapers in terms of diameter reduction per unit length (in freedom units, inches per foot). Tapers expressed as angles have weird numerical values because the tangent of the taper angle is a 'nice' fractional value.

PG (DIN 40430) is an obsolete German thread used for electical conduit fittings. It has an 80 degree included angle. Metric conduit fittings are the standard now, generally 1.5mm pitch in whatever diameter, but adaptors are expensive and somewhat specialised. My reason for suggesting it is it opens the way to 3D print things using this thread, just as you have done with your NPT to metric adaptor.

BA is British Association thread, 47.5 degree included angle. Again, obsolete.

It is why I said if it does not cost much, it would be good to add them. For vee-thread profiles, 60 degree is by far the most common used today, followed by 55 degree, and 80 degree and 47.5 degree in a very distant tie for third place.

This site is very good: https://www.gewinde-normen.de/en/index.html
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KurtF
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Re: Thread Maker v4.1

Post by KurtF »

Ok. It sounds like adding Whitford profile also adds a whole new thread standard, and is worth doing. I've put this on my code todo list. Ditto for changing taper spec from angle to deflection. I will dig into the standard documents for this, and hopefully I can use existing code with new profile added.

Thanks for the engineering insight, I appreciate it. I will go to sleep tonight thinking of how to make an intuitive and convenient dialog for all this. The one I have so far just went back to the drawing board.

TMDialog.jpg
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KurtF
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Re: Thread Maker v4.1

Post by KurtF »

New format:

TMNewDialog.jpg
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Edit: replaced with tweaked version
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bleber
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Re: Thread Maker v4.1

Post by bleber »

I like to see a more visual method to see what parameters doo, it simplifi to understand the tool for all people like veterans and novices.
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KurtF
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Re: Thread Maker v4.1

Post by KurtF »

Oh, I'm with you 100%. I'm newbie as well to FC, and when I'm trying to use a complicated tool, I love it when it has a complete, concise, and well-illustrated help page in the FC wiki. This dialog will have a doc page using many of the graphics already attached in this thread.
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KurtF
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Re: Thread Maker v4.1

Post by KurtF »

If any of you folks have found ThreadMaker useful, I'd like to offer a first crack at my FreeCAD Macro version of this document. This macro actually enforces (and makes convenient) ISO 261 Metric Thread standard, while preserving the "Custom Mode" capability of this ThreadMaker showcase tool. No more looking up standard diameters in tables.
Note: I'm working on the Internal insert add-on now.

bleber, this TMUserGuide.pdf, was written with you in mind. I look forward to your feedback. :-)
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KurtF
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Re: Thread Maker v4.1

Post by KurtF »

If there's anyone still interested in this thread (arf, arf): ThreadMaker 1.0 Macro Set is completed. It fully supersedes this sketch and spreadsheet driven tool, but fully automates all the "table-lookups" needed to generate an ISO standard thread.

Thanks to all who checked this out, and gave feedback.
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thegavs
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Re: Thread Maker v4.1

Post by thegavs »

BA is British Association thread, 47.5 degree included angle. Again, obsolete.
For brand new projects I would agree that BA threads are obsolete, but the project I am working on is restoring an old mixing desk and every screw is BA so it is still relevant and would be great to see included as the new parts designed in FreeCad need to fit with older existing parts.

Gavin
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