Worm gearbox

by unclouded Nov 3, 2015
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I think the worm's threadAngle (which you have as 30) should match the pressure angle of the spur gear (20). But this only became clear at much larger spur gear teeth counts and makes the worm more difficult to print.

Thanks for the feedback! I asked an engineer friend, who agreed and then re-printed with a pressure angle of 30° to check mesh. The resultant gears moved more freely too. I've updated the SCAD and spur-gear.stl to use 30°.

when i try to open in scad to customize, the gears don't load

Check out the top two lines of the OpenSCAD source: You'll need syvwlch's threaded library and MCAD. You may need to edit the paths to those libraries.

ah ok. i've never used openscad before. just solidworks and inventor

really nice, i will try to print one :)

tahnks for sharing