Gear Pitch Radius: Inches
Number of Teeth :
Below is Default values I use and you may change for your own gear.
Pressure Angle: Degrees
Addendum: ( 1/4 ) Inches
Dedendum: ( 9/32 ) Inches
Scale: Pixels = 1 Inches
Face Point Number: Points on the Flank

Enter Pitch Radius of the gear in inches.
NOTE THAT THIS IS NOT WORKING IN Internet Explorer.