Satisfying Dual Stage Planetary Gears

thingiverse

Satisfying Dual Stage Planetary Gears 1.2: New! Now reports a calculation of the gear ratios in the text console! The zip file has been updated. Note: See attached libreoffice .ODT file with formulas for reference. This is a library using OpenSCAD and SatisfyingGears1.7 involute gear library (https://www.thingiverse.com/thing:3022677) and Satisfying Planetary Gears (https://www.thingiverse.com/thing:4099879) to design dual stage planetary gear sets. The principle is that torque should be applied between the sun gear and ring gear of stage 1 by a motor or any other device. The planet gears in both stages should be connected, but this is left to the user's discretion. The output torque should be used between the stage 1 ring gear and the stage 2 ring gear (output). The stage 2 sun gear functions as an idler. To adjust parameters, set DesignMode flag = true. This will display both stage 1 and stage 2 gear sets as flat polygons, with the stage 2 set offset for easier interference detection. Read console messages as some combinations may not work or produce better results than others. Error text will be displayed if tooth counts are incompatible. By default, chevron gears (Layers = 2) are used to facilitate in-place printing. If this is impracticable, set Layers1 and Layers2 = 1 for easier assembly. You must experiment with different settings to achieve the desired results. This library provides only gear geometry; to use these gears in a gearbox, you will need to design the rest of the structure. Research has shown that dowels, screws, and nuts may be helpful. Good luck, and feel free to ask questions if needed. Version 1.0: An issue was discovered where the second stage is not limited to having an exact opposite gear tooth count. Only the center distance must be the same. Version 1.1: The number of teeth on the second stage planet gear must now be selected, "PlanetTeeth2". Version 1.2: This version reports a hopefully correct set of gear ratios in the console, depending on how you configure your gearbox. The attached .odt file includes math formulas for reference. Please leave comments if errors are noticed or help is needed.