Bevel Gears

Hi everyone.

I am probably missing something obvious but when creating two different sized bevel gears from the tool box, how do i bring them into the proper positon in relation to each other. I have brought them close together by using the axis of both gear, but is there a formula for the exact distances that they should be?

None of the sketch dimentions seem to corresopnd to what the correct value seems to be.

Thank you

SolidworksAssemblies