Posted by Ron V on April 23, 2006 at 20:39:16:
I thought you might be interested in this. I posted this question on another forum and received quite a few interesting replies.
“Would anyone be willing to let me know if below is correct / incorrect? It's based on my understanding of the subject.
Operating P.C.D.s can only be used to calculate center distance for spurs and helicals if the amount of correction given to one member is equally inverse to the amount given to the other, e.g. +0.50 and -0.50. If the corrections are not equally inverse to each other then centers can only be calculated using the difference between the operating pressure angle and the standard/rack pressure angle.”
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