Modeling screw threads (1 of 2)

Learn how to model screw threads using helical curves and booleans in Rhino. The threads shown are the type you would see on the end of a light bulb. Changes to the cross section profile and path will provide you with ways of making alternate styles of threads as well. Part 1 of 2
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[Brilliance]

underrated video - super clear, easy to follow. Thanks.... 10 years later lolol.

[wagnerlip]

I will try and find the solution. Anyway, I replaced the half-circle shape with a circle, so even rotating it created a half round nice thread. I really don't know what is happening, in the past I was able to sweep triangle shape without the rotation, for an Acme like thread. Congratulations for the pristine clear and very precise voice/audio/visual. Wagner.

[wagnerlip]

Thank you again, I was able to fix all the issues. Your help was very important. One video that I would need to see is how to stick a JPG image over a cilinder, or an irregular cilinder, like a soda can. I was never able to do it. Thanks again.

[RhinoGuide]

You're welcome! The Taper command may do what you need here. I would suggest using it before the sweep of the thread cross section. Make sure to check out the command line for options when running Taper to control the result.

[wagnerlip]

Hello, thank you very much for showing this lesson in a very clear and easy way, I own you. But being a novice in Rhino, I have certain basic difficulties. No matter what I do, I can curve the extension to the left as you do on 1:14. My extension always goes straight as a line, as a tangent from the helix/cylinder. How do you curve the extension? Thank you so much for any help. Wagner.

[Philip]

Hi,
First of all, nice tutorial!
secondly, when I try to orient my curve perpendicular on the helix rail (like in 2:12), the curve is not perpendicular to the cilinder shape....
resulting in an odd and not straight screw wire.
Any idea how to fix this?

[RhinoGuide]

You're welcome. Look up UV mapping in Rhino 5 for info on texture mapping images to surfaces. This area is effected by the active rendering plugin too and material definitions may or may not have their own UV controls.

[zews]

I was looking for how to make an accurate machin screw thread in Rhino. This is a fantasy screw thread. Screw threads like this don't exist.

[wagnerlip]

Thank you, the "natural" solve the issue. Another problem, at 2:29 my "half circle" straight line does not attach to the helix as yours, vertical, my straight line of the half circle attach as 30 degrees to the left, and then the thread down the helix turns itself around the helix line, with the round part turning to the inner part of the bottom half of the helix. May be it happens because in my helix, at 2:03, there are more control dots... continue

[rimachaudhry]

Hi, i keep getting stuck at 1:45 in as i select the top and bottom of the helix but when i go to scale in 1d i cant select all of the helix/make it yellow. any advice?

[RhinoGuide]

It might be due to the viewport used for drawing the cross section profile. Check if that makes a difference for when you'd need to use roadlike top for the sweep or perpendicular when orienting the profile to the rail.

Thanks for the compliment, this was an early video for me.

[RhinoGuide]

Hi Wagner,
I'm not sure what the difference is in your file exactly but it might be that you needed to change the alignment of the profile when orienting it to the helix. This is controlled in the command line. Or maybe the option for Roadlike Top needs to be used for the Sweep.

[bagofbones]

RhinoGuide can i use this method to create worm gears?
Thanks for the tutorial

[RhinoGuide]

Hi,
Yes, I think you could use the same technique shown for the shaft portion of a worm gear. The other toothed gear could be modeled as a simple extrusion.

[adamjovicic]

how do you make it to a certain pitch/TPI

[Kk-jjxi]

Hello, when I try to extend crv, I can't really extend it nicely as you did, my extension draws larger and bigger, not aligned with the spiral form..

[hafizahkhalid]

Hi, can i use this method to create a riser with helical strakes? I need to use constant height with different pitch. Thank you.

[RhinoGuide]

Hi Wagner,
Check that the extension type is set to natural in the command line.

[yahairam]

why not just use "pipe" command to create the threads? then boolean difference the second part?

[itailu]

Hi :)

Why not run a pipe on the helix?