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Ellipse Gears

drayde
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Published on December 28, 2010

Derived from

Crosslink ellipse gears
by stickoutrock

Description

I adapted stickoutrock's Crosslink Ellipse Gears to be printable on a 3D printer. It's similar to natetrue's version ( thingiverse.com/thing:1538 ), but I created a completely new design in OpenSCAD, which uses a different type of joint, which should be more robust. The joints also do not stick out of the holes in the ellipse gear, avoiding the gears to get stuck during the rotation.

Here is a video of this thing: vimeo.com/18244936

Instructions

You need 2 of the gears and 2 links. The gears are NOT symmetrical. Before snapping them together, make sure you have the gears aligned correctly: Place them on top of each other as shown in the dxf preview and make sure they have the same orientation. Move one of them sideways until the teeth mate.
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poller on April 14, 2011 said:

really much play in it, but its working..

thanks!

JakeV on February 9, 2011 said:

After two hours of waiting Axon could not build the gcode for just one gear. It was stuck on carve. Any ideas?

ssd on February 10, 2011 said:

I don't recall having any problems. What version of skeinforge?

drayde on February 9, 2011 said:

Hmm, I'm using netfabb, so I cannot really help here. Maybe try using skeinforge directly?

efinkg on January 20, 2011 said:

Mine finally printed, after much kicking of the cupcake.

One weird thing I've noticed, is that the gears never actually touch, they mesh but there is an ~.5mm gap between the gears at all locations.

ScribbleJ on January 19, 2011 said:

Used the joiner from mackal linked above. I am SUPER-impressed; it all snapped together right out of the printer. Nothing too tight, nothign too lose; no extra play between the gears, but not too tight either. ABSOLUTELY. PERFECT.

cyberbadger on December 30, 2010 said:

Printed it on an UP! at medium (0.30mm) - very loose...

cyberbadger on December 31, 2010 said:

Using mackal's linkage this is much better!

http://www.thingiverse.com/thi...

Thanks drayde and mackal!

Lenbok on December 29, 2010 said:

I'm gonna have to try this! I'm actually in the middle of printing the other elliptical gears as I write - I found that the link piece is definitely very brittle, particularly when printing with PLA.

michthom on December 29, 2010 said:

Very nice looking design but came out a bit loose on my Makerbot + HBP. I may tweak the OpenSCAD file to reduce the link length - thanks for including that drayde. Making the gears parametric would be heroic too, but my maths isn't up to it!

drayde on December 29, 2010 said:

Wow, that was quick! Nice print!

Yes, the link appears to be a bit too long in the position where the links form an "X". It already tried to make them a bit smaller, but then it's too short for the horizontal position.

I suspect the holes for the joints to be slightly off.

Having the gears created by script would be awesome. Any idea how to do that? Ideally I'd like to be able to create the 2D outline by script and then extrude it, but I think OpenSCAD cannot do that.

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License

Ellipse Gears by drayde is licensed under the Attribution - Creative Commons license.

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