Posted by Michael Ignat on April 23, 2006 at 23:09:39:
In Reply to: Calculating corrected centers. posted by Ron V on April 23, 2006 at 20:39:16:
If we define the operating diameters as the diameters where pure rolling occurs, then (CD std or modified):
RollingDiaPin=2 x CenterDist x NoTeethPin/(NoTeethPin+NoTeethGear)
RollingDiaGear=2 x CenterDist x NoTeethGear/(NoTeethPin+NoTeethGear)
StdCDxcos(StdTransvPA)=AnyCDxcos(RollingTrPA) (=PinBaseRadius+GearBaseRadius)
The operating (rolling) dia's are generally different from std pitch dia's+correction on dia's