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1cm Bolt, Nut, and Screw

by MaskedRetriever, published

1cm Bolt, Nut, and Screw by MaskedRetriever Mar 27, 2009

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Summary

In the absence of an easy way to generate a bolt with both a gear-shaped thread and a diameter and thread angle I decided to let the thread script generate something "reasonably metric".

The bolts have a diameter of 10cm and thread spacing of 2mm. Rather than gear-shaped (which has a number of mechanical advantages but which I don't have a script to do all the work for me) the threads are triangle shaped.

The nut has been scaled up a few percent laterally, which hopefully will make it work with the bolts. If these print, it should be possible to do a lot of the things one does with bolts, screws, and nuts, printably.

The script parameters to duplicate bolts are:
diameter: 10 units
step: 2 units
indent: 1 unit

Blender can make bolts and screws of any length with those parameters. A slightly larger diameter (10.2 or so) with the same step and indent parameters should create nuts, threadings, etc.

Edit: Tweaked the screw's tip a bit: I think it probably would have printed in such a way as to not fit to the nut. (It's possible I haven't fixed the problem that caused the screw cap to fail, but the most obvious problem with that design looks like it wasn't in this model.

Instructions

Print, use.

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Built and the fit is way tight, also found it strange that it was reverse threaded, but the world needs those machine screws also!

Yes, I wonder when the nuts and bots become a serious candidate for removing them. Not because they are expensive, but just because it's just as easy to print them and it will be equally or even more effective. Eventually a RepRap will be clicked together entirely without needing any separate bolts, they could be integrated in te part, or a snap fit / interlock system.

Snap-fit joints are actually another project I want to do-- There's one in the 64:1 gearbox, but I'd like a nice, standard snap-joint that can be dropped into designs.

Lego-like snap systems work too, but a "push till it clicks" sort of thing would be great.

As to doing gear-shaped threadings, I'm starting to think scriptability might trump matching to standard equipment if one can always print nuts and bolts. Of course, if someone (cough cough) were to upgrade the Blender threading script we could have our cake and eat it too on this matter...

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