Hello,
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?
thanks,
45° pressure angle? Zoiks!
Base diameter is determined by pitch diameter and pressure angle. Involute is built from the base diameter.
For the involute profile, you don't need to know the other gear's diameter or pressure angle. However, the pitches need to match.
Part of the beauty of the involute is that it still works if the gear center distances are off. The pitch diameter and pressure angle will be different IAW the contact point.
See attached.