標題
    Accurate, adjustable spur gears
 
    描述
    These are very accurate spur gears.
You can change the number of teeth, pressure angle, pitch, and even profile-shift. 
All changes are made in a design table.
Includes a 3 gear assembly that updates automatically.
Can go to infinite number of teeth on large gear file.
Use the "many teeth" file for gears w/ ~ > 75 teeth.  If you get an error, use other file