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How to thread a series of cylinders together

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Message 1 of 9
precisiontintusa
316 Views, 8 Replies

How to thread a series of cylinders together

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!

8 REPLIES 8
Message 2 of 9
etfrench
in reply to: precisiontintusa

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

etfrench_0-1715227818899.png

Decreasing the pitch to 0.5mm will work:

etfrench_2-1715227888526.png

 

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

ETFrench

EESignature

Message 3 of 9
precisiontintusa
in reply to: etfrench

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.


Message 4 of 9
etfrench
in reply to: precisiontintusa

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

etfrench_0-1715229012363.png

 

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

etfrench_1-1715229454147.png

 

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

ETFrench

EESignature

Message 5 of 9
precisiontintusa
in reply to: etfrench

Gotcha. I'll give that a try. Thanks for the tips.
Message 6 of 9
precisiontintusa
in reply to: etfrench

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

Message 7 of 9
etfrench
in reply to: precisiontintusa

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.

etfrench_1-1715237373388.png

 

 

ETFrench

EESignature

Message 8 of 9
etfrench
in reply to: etfrench

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

ETFrench

EESignature

Message 9 of 9
precisiontintusa
in reply to: etfrench

Perfect. Thank you!

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