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when ring_gear() is large, it has too 'long' teeth interfering with inner gears. #8

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hzeller opened this issue May 25, 2020 · 0 comments
Open

when ring_gear() is large, it has too 'long' teeth interfering with inner gears. #8

hzeller opened this issue May 25, 2020 · 0 comments

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@hzeller
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hzeller commented May 25, 2020 

echo "include <gears.scad> planetary_gear(modul=1, sun_teeth=30, planet_teeth=60, number_planets=3, width=5, rim_width=3, bore=3, pressure_angle=20);" > foo.scad
openscad foo.scad --camera 74,0,0,0,0,0,55 --projection ortho -o foo.png

Results in
foo

The teeth of the outer gear clearly interfere with the planet gear. Note, this is fine in smaller gears, it just becomes apparent with larger gears.

The expectation would be that the teeth are clear, something like
bar

I suspect the root circle diameter calculation (df = d - 2 * modul * ha) needs to be refined, but I have no idea what the right formula would be.
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