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Parametric Thumbwheel

by 67restomodder, published

Parametric Thumbwheel by 67restomodder Nov 21, 2011
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License

BSD License
Parametric Thumbwheel by 67restomodder is licensed under the BSD License license.

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Summary

I am upgrading the build platform on my Prusa and liked the thumbwheels from HBP Quick Leveler Redux, but I needed some to fit M4 nuts. So I decided to write a parametric OpenSCAD script to make thumbwheels of any size. The included stl is for an M4 nut.

Instructions

If you need M4 thumbwheels, use the included stl and make as many as you need using multiply in skeinforge. If you need a different size, download the .scad file and have fun. I included lots of comments to hopefully make it easy.

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Just had a look at your script and your method for creating captive nuts is interesting but I wanted to let you know there is an easier way. If you create a cylinder with 6 facets and a radius of the nuts width across the flats divided by the square root of 3 you will have a hexagon the correct size! So in openscad this might look like the following:

cylinder(h=wheel_h,r=m4_nut_w/sqrt(3),$fn=6);

An m4 nut is 7mm across the flats so if you add a little, maybe 0.25 or 0.5, and divide that by sqrt(3) you end up with a good captive nut size.

Cheers.

I like your suggestion and tried something similar after I wrote this little script. Interestingly enough, I did not invent the hexagon method found in my script: I copied it out of the Prusa Mendel OpenSCAD source. =-O

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