3D Printed Screw Threads

[Dave R]

Thank you sir.

[Dave R]

More screw threads. These are 23mm long.

They are for a model of a U-joint from around 1900.

The center ball and short pieces of the shafts have been printed. Yokes are printing now. Looks like I managed to get the screws dirty fitting them into the holes in the ball. I haven't decided it I'll print the tapered pins or make them a different way.

[ntxdave]

@tuna1957 said:

Dave , your mechanical bits never cease to amaze and delight me.

I agree with tuna57 completely.

[Dave R]

Thank you.

[Dave R]

Finished except for the tapered pins.

[ntxdave]

Nice

[HornOxx]

klasse!

[rspierenburg]

Hey this is awesome, just a quick question. What do you typically use for tolerances between the nut and bolt? I know it depends on the printer but just wanted to get a baseline idea.

Robert

[Dave R]

Thanks.

@rspierenburg said:

What do you typically use for tolerances between the nut and bolt?

I nrmally model the internal and external threads to the specifications given for the thread type and class. In some cases if I'm feeling lazy, I just scale up the internal threads by 1.02 or 1.03 in X and Y without scaling Z. I've found I can't be lazy with Acme and square threads, though. Scaling doesn't work for them. They have to be modeled correctly.

[Dave R]

M6 x 1.0 screws. I didn't have any short enough metal ones on hand and it was faster to print a couple than go to buy some for this proof of concept thing.

[Dave R]

[Rich O Brien]

I'd find it hard to resist the urge to hit that with a heat gun to smooth it out.

Crazy accurate modelling. Does it hold a seal?

[Dave R]

I would like to do something to smooth it out but it's fine as it is. The threads have a fit typical of metal ones but it won't whistle. I think because the PLA doesn't resonate like bronze, brass, or iron would.

I expect I could run steam through it. Once.