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Customizer Planetary Gearbox
by chowderhead, published
WARNING: I haven't personally printed all these things and it is definitely a WIP - use at your own risk! If the STL doesn't look like it's going to print, it probably won't.
Having said that, this should allow you to make a custom planetary gearbox having a selectable final ratio and other nifty features. The item pictured is a two stage planetary gearbox with a final ratio approaching 30:1 (that works swimmingly, BTW). Single stage gearboxes can be printed, too.
I'll keep playing with the script as suggestions and problems arise and I make no excuses for the ugliness of the code...
02.09.13 - yes, I have no life. More housekeeping and included the ability to choose between NEMA17 and NEMA23 motors. As I have no NEMA23 motor to test with, those who do and print parts for said motor, please let me know if it works or not. Dimensions were pulled from datasheet.
02.04.13 - housekeeping with the script; fixed an error with the 5.45 ratio (sorry).
The parts print best singly, at least on my printers, hence the ability to render single parts in Customizer.
I've included a few ratios that should produce printable components; some tweaking of "Diameter Ring" may be required to get decent sized sun and planetary gears.
Setting "Helix Angle" to zero will produce spur gears, any other value will produce double helical gears (Herringbone). Herringbone gears will probably last longer, work quieter and if a multi-stage gearbox is being built, they self-align in the ring gears, which is a good thing.
"Radius Ring Back" sets the thickness of the ring gear wall.
"Height Motor Pedestal" will set the overall height of the end to which the motor mounts.
"Height Output Mount" does similar to the output end.
Print gears slowly with lots of cooling for best results. Put the planetary gears on a raft to insure their shape remains intact (important with herringbone).
Specifics can be found at http://www.thingiverse.com/thing:41876.
Please let me know how it works and what improvements/features would be valuable!