Hand G-code brass cycloidal tooth gear.

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JustinO
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Hand G-code brass cycloidal tooth gear.

Post by JustinO »

https://www.youtube.com/watch?v=UNiuqz_VIJ0

Using hand coded G-code to cut a 1/2" brass gear for an orrery. It's running on LinuxCNC using parameter calculations and "O codes". I set the basic definitions for the gear -- number of teeth, pitch radius, center to center distance, etc. Then the G-code makes the simple linear and arc motions that interpolate to create true epicycloidal teeth. The gears don't conform to horological standards, but they are mathematically and geometrically correct, and the pairs mesh perfectly. The results are actually amazing -- smooth enough that only a very light pass with a 3M radial bristle dremel wheel polishes off the burr.

--Justin
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ArtF
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Re: Hand G-code brass cycloidal tooth gear.

Post by ArtF »

Hi Justin:

  Nice work. Saved alot of time from all the shaving normally needed.

Art
JustinO
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Posts: 137
Joined: Mon Jul 30, 2012 2:13 pm

Re: Hand G-code brass cycloidal tooth gear.

Post by JustinO »

Thanks Art,

I do the same thing with involute teeth, but have not videoed it; I'll post it when I have.
Next on the agenda, saw shaving octoidal miter gears -- I have a potential customer for these!

Your software always has a shortcut prominently on my screen -- I often use it to make a wire frame to photoshop over photos of partially obscured gears -- it's a quick way to accurately confirm tooth counts and pressure angles.

--Justin
Odhner.com
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