5 Replies Latest reply on Aug 2, 2013 4:00 PM by Jim Sculley

    Involute Spline sketching

    Joseph Pizzoferrato



      I am trying to create an involute spline curve for gear teeth on the outer profile of a part. 


      Spline Data is as follows:


      # teeth = 128

      Pitch = 10/20

      Pressure angle = 45

      Base dia = 9.05

      Major dia = 12.9

      Pitch dia = 12.8

      Form dia = 12.71 Max

      Minor Dia = 12.67 Min

      Pin Dia = .1920


      The teeth sit on a 12.9'' OD.


      I calculated a few items i needed:


      Pitch(teeth/inch) = 10

      Tooth thickness = p/2 = .157

      Addendum distances = 0.1

      deddendum distances = 0.125


      I have attached  a picture of what i have so far.  The pressure angle with the horizontal is 45 degrees.


      The base dia is off the screen and drawn at 9.05'' OD.


      I do not have data for the gear that will mesh with the gear I am creating.  Do i need any meshing data from the other gear?


      I highlighted the top of the tooth in red where the pitch dia and addendum dia meet to create the top of the tooth. 


      Does something not look right?