Bevel/Miter Gear Mounting Distances

[mrwright]

So we are playing around with bevel and miter gears for our gearboxes. We can't seem to find an easy to understand formula for determining the proper mounting distances.

Right now we are using the 15t bevel gear from VEX Pro and are trying to design a simple 90 degree 1:1 mesh.

Are there any handy formulas that you all use to determine the mounting distances?

We are familiar with spur gear mounting distances, mating proper DP, etc.

Can anyone help or give examples?