V Belt Groove Design - Have I got it right?

[emisnug]

All common V belt designs use 40 degree included angle (that is the sum of both side angles). To compensate for the belt deformation pulleys always have a smaller angle; the smaller the pulley, the smaller the angle.

I had a read through the Machinery's Handbook; for a 200mm diameter pulley, you want a 38 deg. included angle and a depth of at least 14.7mm below the top of the belt.

I had a read through my ancient copy of American Machinist, got 37.5 deg and 19/32'' depth! I think I've sorted most of it now, and also used a downloaded CAD model of the drive pulley that we're using to make sure.