How to design a perfectly-meshing Hirth joint/coupling (That can actually be manufactured!)

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Link to the file: tinyurl.com/8w3fyt5e
Didn't find any tutorial online on how to parametrically design a proper Hirth coupling that can perfectly mesh with itself and is also manufacture-able.
This took a while to figure out, so I wanted to share in case it could be useful for anyone else.
Tried to do this on solid-edge but it kept crashing so had to do this on onshape (while also learning onshape....)
Once you master this basic technique, you can implement it in more complex designs.
Manufacturing can be done on a 2.5 axis CNC mill/router (requires moving vertically while cutting horizontally) or using 3D printing.
If you use this, let me know!

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13 янв 2021

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Комментарии : 17

@erniemathews5085 Год назад

As a biker born in 1942 when the strongest roller and ball bearing crankshafts had Hirth joints this is fascinating, almost magical.

@Kediil 2 года назад

Couldn't find a decent tutorial to do this anywhere but here. Really wish it had spoken instructions, or at least hover the mouse longer so I can see what you're selecting. But I managed, half way through blind luck, to figure it out. Doesn't help that I was using Fusion360, but it got done!

@leavoa 2 года назад

Happy to hear. Editing this video was an interesting experience since it showed me just how difficult it is to create the quality content we get on RU-vid for free. Thanks for the notes, I'll take them into consideration if I ever make another video.

@strawburrymilk496 4 месяца назад

ive got both triangles at 100 degrees but i can only fit 39 teeth. its not clear what you did at 3:11. i think thats where it went wrong

@roberthays6964 Год назад

This was very helpful and neat. Thank you! At 2:02, you create the line going up at the midpoint of the hypotenuse of the triangle. This will be where your future plane is at to create the second triangle that you then loft between. Why do you choose the midpoint of the hypotenuse? I ask because my original body that I revolved has more top surface area (less of a hole in the middle). So, choosing the midpoint actually isn't going to cut all the ways through when I loft between the two triangles. I am thinking that I need to create my triangle closer to the origin instead of at the midpoint of that hypotenuse. But I am wondering if there was a specific reason that you did it this way that would mean I shouldn't do that ... and maybe I should instead widen the center hole. I like the smaller center hole because it will give more binding surface area between the two couplings. Thank you for your input!

@leavoa Год назад

Hi Robert, Happy to hear you found the video useful! There is no special reason to choose that midpoint, it was merely a convenient way to have the sketch become "fully defined" without dimensioning the distance to the center. Let me know how it goes, I'd be happy to hear you made it work and to see the end result.

@roberthays6964 Год назад

@@leavoa it went well, thank you! I will try to upload the file of where it is at right now.

@dannyortiz8409 3 года назад

Is it critical to have the inner and outer triangles to be parallel to each other?

@dannyortiz8409 3 года назад

Also, do you happen to have any reference or calculations to figure out the number of teeth per angle?

@leavoa 3 года назад

@@dannyortiz8409 Not sure about the parallelism question. You can try it out yourself and see. Number of teeth is up to you. If you want sixty teeth, make sure each triangle takes up (360/60)=6 degrees. And use six degrees in the circular pattern (or sixty instances)

@DJMadMaarten 3 года назад

Nice! Could you maybe give me the .STEP of this?

@leavoa 3 года назад

Sure thing: cad.onshape.com/documents/00e8776cc73eafe9e9a21abb/w/dc812d2316c7834a92890f6b/e/551d20a4c3254e399c137764

@danielhigh3260 3 года назад

Hello would you be interested is selling hirth joint ? What you have made is what I want

@leavoa 3 года назад

Hi Daniel, do you mean the CAD file, or the physical object?

@danielhigh3260 3 года назад

@@leavoa the physical object about the size of a half dollar or maybe a quarter

@leavoa 3 года назад

@@danielhigh3260 I don't sell these, but the folks over at www.hirth-joint.com/ seem to. (No relation to them)

@beardedamerican8929 3 месяца назад

I love and hate this video. You jump around so much that it's hard to follow. Then when I copy what you do to start the circular pattern, my loft gets erased and you don't show how you grab the loft, saying it's complete when it's not. How do you grab the loft when it wants you to grab an entity? A loft isn't an entity.