Hollow Knotted Gear

Design by glyphobet
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The green knot revolves twice, making three full rotations along the way. It forms a rectangular cross section and a triangular hole.

The blue knot revolves three times, making two full rotations along the way. It forms a triangular cross section and a rectangular hole.

The two knots fit perfectly together, and only orbit each other by moving together.

Inspired by Oskar van Deventer's original Knotted Gear: http://www.shapeways.com/model/11915/knotted_gear.html

The first few rotations of the knots will feel a bit rough, but once you gently rotate them ten to twenty times, they smooth out. Also, the knots rotate much easier in one direction than in the other.
cm: 7.196 w x 4.06 d x 4.5 h
in: 2.833 w x 1.598 d x 1.772 h
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glyphobet
glyphobet says:
Thanks! It seems rugged enough, although it wouldn't survive being stepped on. It is very lightweight and very flexible, which helps.
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May 1, 2010, 4:21 pm
Oskar_van_Deventer
Oskar_van_Deventer says:
Nice! Also a gearing ratio of 2:3, I see. How rugged is it? Oskar
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May 1, 2010, 11:58 am
 
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Keywords
Art Sculptures Mathematical Art extrude extrusion gear hollow knot knotted torus trefoil trefoil knot