Helical gear - helix angle measure

[peenzano]

Hello Dear community,

I have a helical gear which I would like to desing in Fusion360 and the biggest problem for me is to measure/calculate helix angle of that gear.

Is there a solution or some method, how to do it properly? How to calculate the helix angle?

[MichaelT_123]

R1*θ1 = R2*θ2

[peenzano]

Sorry, it doesn't say to me much. I'll appreciate a bit of explanation.