Posted by Bill on October 20, 2000 at 14:47:02:

In Reply to: Long Addendum posted by Don on July 19, 1999 at 07:38:20:

The equation you are looking for is in AGMA 917-B97 and others The formula for percentage of modicication is the maximum of either 0.0 or 1.05-Nuber of teeth*sin(transverse preassure angle)*{sin(transverse preassure angle-cosine(transverse preas angle)*tan 5 degrees}/(2*cosine(Helix angle) The transverse preassure angle is equal to taninverse(tan (preassure angle)/cosine (helix angle)) sorry for the typos I r an engineer