Customizer Planetary Gearbox
by chowderhead, published
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...
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I'll get the new version of the SCAD up to the github repo (https://github.com/mtu-most) soon. There's most of a 4.62:1 gearbox in the planetary extruder repo. No more Thingiverse for my designs...
I want to convert to 625/M5 to mimic a motor shaft. What needs to be changed to use a different bearing size and output shaft?
Great set ! I'll definitely try to use this when trying to make new geared dual extruder that could have regular M8 hobbed bolt as output. But. I see that there is dimensions for both 608 & 624 bearings and i thought that "module bearing(type=608)" would affect the model... but no. Probably for some obivous reason :) (Im not so expert on scad files...)
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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 thingiverse.com/thing:41876.
Please let me know how it works and what improvements/features would be valuable!
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