General Category > Oddball
Colibri Hummingbird Dynamic Sculpture - WIP
kvom:
I would like the gears to be brass, but again finding 6" round pieces 1/4" thick is problematic. Again galling would be a problem with all aluminum. My idea is for the center large gear to have an aluminum body with brass gear teeth attached, made in two pieces. The other two large gears will be aluminum, and the two smaller pinion gears brass.
crueby:
How about grey PVC sheet, is that any better on price? I had gotten some 1/2" and 3/4" thick offcuts, machines quite well and the surface is quite smooth.
kvom:
That would be the cheapest material yet. Worth a look see.
awJCKDup:
How about aluminum with an anodized coating?
kvom:
Made a test setup for a gear/hypocycloid/cam from some 1/4" 6061 and some 1/16" SS dowel pins. I should get the hypocycloid gear from Shapeways early next week and can see how the friction is between the parts. I don't foresee any problems, but I don't want to start on the frame components before checking.
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