[OpenSCAD] Internal gears?

nop head nop.head at gmail.com
Tue Aug 16 13:13:58 CEST 2011

Incidentally, why do I find things like cp = 360 * d / (t1 + t2); with mcad
where I would expect cp = 2 *pi * d /(t1 + t2). I.e. circular pitch seems to
be scaled from radians to degrees but it is a length, not an angle. So it
seems to be a length expressed in mm * 180 / pi units. Is this normal when
expressing a length along an arc?

On 16 August 2011 10:25, Giles Bathgate <giles.bathgate at gmail.com> wrote:

> On 16 August 2011 10:20, nop head <nop.head at gmail.com> wrote:
> > Jag subtracts a spur gear from the housing but he uses a modified version
> of
> > involute_gears.scad that allows him to increase the addendum by a factor
> of
> > 1.4.
> Well I suppose you could create an internal gear to ISO metric
> specifications, but then I wonder if its entirely necessary for a part
> that is going to be produced on a RepRap? The tolerances are not going
> to be as high as a machined gear so you would need to find a design
> that is a compromise.
> Regards
> Giles.
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