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2D Spring Generator

by scanlime, published

2D Spring Generator by scanlime Jan 22, 2011

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Summary

This is a parametric OpenSCAD script for generating two-dimensional springs. This is the same basic idea that many of the wobble arrestors and snap-in parts use: long, thin plastic segments that are designed to flex a bit. I just generalized the concept a bit.

These springs seem relatively sturdy, and they can be used along the XY plane, or (less ideally) along the Z axis.

You can make the springs stiffer and stronger by making them thicker (taller). Adjust the spring constant by changing the total length of the spring, either by adjusting the radii of the inner/outer circles, or by changing the arc angle of the springs.

Depending on the quality and calibration of your printer, you may or may not be able to make the springs thin enough that they turn into a single plastic filament. When I tried this, the springs were more flexible, but there were more errors in the print due to extruder starting/stopping and due to shrinkage. I made the springs two layers thick, and they print much more reliably now.

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Thanks! I compared with other OpenSCAD springs: This one renders fast!

This would fit well in MCAD, the definitive openscad library. The best way is to fork on github and do a pull request: https://github.com/elmom/MCADhttps://github.com/elmom/MCAD but I can do it for you too. Just needs to be licensed as "LGPL 2.1 or later"

This would fit great in MCAD, the definitive openscad library: http://reprap.org/wiki/MCADhttp://reprap.org/wiki/MCAD

You can do a fork (https://github.com/elmom/MCAD)https://github.com/elmom/MCAD) and request a pull, or just license it as "LGPL 2.1 or later" and I can do it for you.

wheels with built in suspension? Love. It.

Ooh! How about using these to make a DIY accelerometer???

I'm thinking the calibration would be a nightmare for printed plastic springs, not to mention terrible sensitivity. The MEMS sensors are still a really good bargain. :)

Wow! That's really cool. I could imagine making these with an outer diameter the size of a 608 bearing and slipping them into my pillow block with a lock nut in the center. That would make for a nice no-wobble linear motion component.

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