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Simple Planetary Gears

by jonducrou, published

Simple Planetary Gears by jonducrou Feb 2, 2012

Featured Thing!

Description

Set of planetary gears and arms to hold the planet gears in place.

Based off OpenSCAD code from thing:7390 (after cutting out significant portions of it - because the original thing is much more than a toy).

The gear ratios are very interesting, and (at least at first) non-intuitive, depending on the part that is held stationary.

With a fixed Annulus or Sun, this gives 1:6.
With a fixed Planet carrier, this gives 1:5.

Recent Comments

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Pretty much has to be on a flat surface to be used. I have been meaning in revisit this and add a holder for the sun and annulus - but it's not high on my priorities.

I'm surprised that the Annulus doesn't call off. How sturdy is this?

I haven't got enough pretty colours - but check this out: http://www.thingiverse.com/der...

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Instructions

1. Print it.

2. Assemble.

Comments

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sminnee on Apr 30, 2012 said:

I'm surprised that the Annulus doesn't call off. How sturdy is this?

jonducrou on Apr 30, 2012 said:

Pretty much has to be on a flat surface to be used. I have been meaning in revisit this and add a holder for the sun and annulus - but it's not high on my priorities.

Anonymous on Feb 10, 2012 said:

Could you color it? It would be cooler looking and easier to comprehend if the different types of parts were different colors.

Best regards,
Steve C.

jonducrou on Feb 12, 2012 said:

I haven't got enough pretty colours - but check this out: http://www.thingiverse.com/der...

Greymantalker on Feb 9, 2012 said:

Any chance of saving the scad file to DXF format and posting here for the laser guys? thx

jonducrou on Feb 9, 2012 said:

I'm not exactly sure how to - but I will look into it.

Anthony on Feb 4, 2012 said:

Jon,

I am trying to build a rope machine and this sun gear configuration looks like ti will work. I need to build a housing to hold the gears and have he 3 gears turn three small hooks. the middle gear can be motorized or cranked I think.

Anthony

Greymantalker on Feb 3, 2012 said:

Great place to calculate gears and ratios and all that kind of stuff...

http://woodgears.ca/gear_cutti...

Also can you post a DXF file from the scad file here for us guys with a laser cutter/engraver? thx

Anonymous on Feb 3, 2012 said:

Whatever happened to "GregFrost's involute gear script", I cannot find it anywhere now.

Anonymous on Feb 3, 2012 said:

Is says above: "Derived from 1:216 gearbox" thing 7390.

But that has DiffPlanet.scad which contains a reference to this: "
&
lt;MCAD/involute_gears.scad
&
gt;"

There is nothing called "involute_gears.scad" in any of these places:

thing:7390 has "DiffPlanet.scad" but no "involute_gears.scad" which it refers to

thing:3575 has "parametric_" v4.0 and v5.0 names (must i rename them?)

thing:3534 has "parametric_involute_gear.scad" - change Diffplanet to match?

3543 refers to http://github.com/TheOtherRob/... but it is a dead link

thing:3575 has the" parametric..." 4.0/5.0 again, no 'involute..." and leads to

thing:3547 "the original", which says "404 You've reached the end of thingiverse"

thing:3001 has something with a similar filename, but in python

http://www.thingiverse.com/Gre... doesn't refer to his script at all.

NOTHING in THINGIVERSE seems to have "involute-gears.scad".
Searching "GregFrost's involute gear script" in the wild:
gives http://www.makerbot.com/blog/t... which has the same-old.
gives links back to things 3547
&
amp; 3575, which I covered before.

What does everyone else know that I'm clueless about?
Waaah! (where's my pacifier).

on Feb 3, 2012 said:

Hah! Just yesterday I had a visitor to my desk ask about a set of these. Next desk toy!

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