Help with properly animating a worm gear

kael_c

I cant seem to find the correct Relation ratio using the gear mate, i am using a 4 tooth worm gear with a 20 tooth spur gear. What kind of math should i use to figure out the Relation Ratio?

Document Link:
https://cad.onshape.com/documents/04b65753b634fccee6d83cbd/w/80cd83a296b18682ca372a64/e/aa1c4ccd267c8dfdbf49ded0?renderMode=0&uiState=65bbd2c79a94840854f443d1

Matt_Shields

That's a weird worm gear, so it's hard to calculate the pitch, but it's something like 4.8 mm in your assembly.  And the pitch diameter of the other gear is 40 mm.  So the gear ratio would be 4.8/(pi *40) = 0.038.  Or it might be the reciprocal of that, 26.18.

kael_c

Thank you very much, i'm just messing around with gears and animating right now.