topic Re: How to thread a series of cylinders together in Fusion Design, Validate & Document Forum

How to thread a series of cylinders together

precisiontintusa — Thu, 09 May 2024 02:47:52 GMT

I'm trying to create a series of cylinders (25mm diameter and 3mm thick walls, the rest hollow) that can all be screwed together to create a longer cylinder. I have the external threads down, but I can't seem to create a cylinder with internal threads that ends up with the correct diameter. Image attached of what I have so far. I'm sure it's something simple, but I'm still learning Fusion. TIA!

Re: How to thread a series of cylinders together

etfrench — Thu, 09 May 2024 04:12:54 GMT

There is no standard metric thread which will give you a smooth 19mm bore and a smooth 25mm outer surface. 22mm - 2 comes close.

Decreasing the pitch to 0.5mm will work:

So the questions is do the inner and outer diameters have to be same for both?

Re: How to thread a series of cylinders together

precisiontintusa — Thu, 09 May 2024 04:18:00 GMT

Thanks for the info. I would like the outer diameters to be the same, but
the inner diameters can be different.

Ultimately, these will connect with 1-5 other cylinders to create a very
long unit.

I don't necessarily need standard metric threads. They can be any style as
long as they will securely screw together.

Re: How to thread a series of cylinders together

etfrench — Thu, 09 May 2024 04:40:17 GMT

22x1.5 is standard fine pitch. It would probably still need extra support on the inside.

I'd be more inclined to use a coupling between each cylinder instead of having male and female threads on each cylinder:

This would probably be a good excuse to use the Simulation workspace😀

Re: How to thread a series of cylinders together

precisiontintusa — Thu, 09 May 2024 04:40:00 GMT

Gotcha. I'll give that a try. Thanks for the tips.

Re: How to thread a series of cylinders together

precisiontintusa — Thu, 09 May 2024 05:21:35 GMT

Would you mind sharing how to create the coupling? Still getting my bearings with Fusion,

Re: How to thread a series of cylinders together

etfrench — Thu, 09 May 2024 06:51:35 GMT

Each of the parts are just simple revolves from one sketch. Using the centerline type allows entering dimensions for the diameters instead of the radii.

Re: How to thread a series of cylinders together

etfrench — Thu, 09 May 2024 06:54:25 GMT

p.s. Only one of the cylinders needs to be modeled. Just make copies and use joints to connect them to the coupler.

Re: How to thread a series of cylinders together

precisiontintusa — Thu, 09 May 2024 20:37:02 GMT

Perfect. Thank you!