Gear C. A. M. Gear Design / Calculation Software for Involute Spur & Helical gears, Racks, Pinions & Internal Gears, 3 Gear Trains, Sun Planet & Ring gear sets and now BS3550 Splines. This software will help you design all types of gearing as above for the following: New gear designs. For visualising existing designs. Adding a mating gear to a current gear set.