Molded Wheel

by LucidOne, published

Molded Wheel by LucidOne Dec 29, 2009

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These DIY molded rubber wheels might be perfect for your next robot.

The mold rubber used was Smooth-On part # PMC-121/30 Dry.

The alternate wheel hub will hold the rubber more securely but may be more difficult to print on some printers. The aluminum hub to attach to the motor is not included, but this should work.

More robot related information at http://www.iheartrobotics.com


0) Print two sides, one base and a hub to make one wheel.

1) Sand and seal the sides and base with a clear spray enamel. Do not seal the hub, it should remain porous.

2) Assemble the sides and base with screws, and apply mold release. Do not spray mold release on the hub and do not attach it until after mold release has dried.

3) Mix mold rubber according to manufacturers specifications and pour into convenient funnels mounted on the side.

4) Tap gently to remove air bubbles and let cure.

5) Wait patiently.

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I looked at OpenSCAD, it is pretty interesting and I'll probably try it in the future, but it just is not efficient for complex parts.

What is desperatly needed is a real mechanical CAD program for Linux. Blender seems philosophically opposed to dimensioning and datums. Sketchup is not free in either sense and I find the lack of reference geometry combined with the push/pull interface to be a little confusing. Dimensioning drawin
gs properly might not be a problem with a 3D printer but it is critical if you need someone else to make your part accurately and cheaply.

Something like Solidworks or Pro/E for Linux would be ideal. Then you could draw the parts and save them out as openscad models without editing a bunch of code.

If anyone has suggestions for a mechanical CAD software for linux that doesn't involve typing, I'm open to ideas.

Yeah, mechanical CAD for Linux is pretty primitive. I think OpenSCAD is a good starting point, though, and could see it evolving into the sort of tool you're looking for-- it's only a couple of months old.

WOW! that is so cool.

Have a look at openscad and do a parametric version