[OpenSCAD] Internal gears?

nop head nop.head at gmail.com
Mon Aug 15 17:38:10 CEST 2011


If I understand
this<http://capolight.wordpress.com/2011/01/22/drawing-gears-in-sketchup/>tutorial
correctly you can just subtract a spur gear from a larger circle. I
am not sure that gives the right profile though.


On 15 August 2011 16:07, Steven Dick <kg4ydw at gmail.com> wrote:

>
>
> On Mon, Aug 15, 2011 at 10:47 AM, nop head <nop.head at gmail.com> wrote:
>
>> Has anybody written a script for internal gears<http://en.wikipedia.org/wiki/Gear#External_vs_internal_gears>?
>>
>>
>>
> There's a number of internal gear things on thingiverse (planetary, etc.),
> and I thought at least one of them used OpenSCAD.
>
> I was under the (probably mistaken) impression that one of the OpenSCAD
> libraries supported internal gears by making one or more of the gear
> parameters negative.
>
>
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