How to deisgn INTERNAL HELICAL GEAR in SW-12

Can any one know how to make internal helical gear and pinion by using of EQAUTION?
if know pl help me, how to do it?
Thanks in Advance
2 Answers

internal helical gear is not available in solidworks toolbox. the easiest way is using geartrax.
using equation is not a reasonable way. as you should know the exact equation for each gear. but if you want to test that insert your equation in
"Tools> sketch entities> equation driven curve"