A solid base mounts an epicyclic arm, which is free to rotate about a fixed pivot point on bearings. Onto this arm are mounted durable plastic gears. Spur gears of 40, 60, 80 and 100 teeth are provided, with a module of 1. Pins mount the gears in position and they are easy to remove and fit. Gear mesh is precise and allows easy rotation of each gear. The gears can be arranged in simple, compound or planetary gear trains. The compound gear train requires two gears to be interlocked via pins. All gears within the apparatus can be locked together to form two gear compounds.
The epicyclic arm can be locked in position during simple and compound gear train work or released for planetary work. When released the arm is free to rotate about its pivot point. Gear spacers are supplied to ensure all gears remain at the right heights during the many combinations of gear arrangement achievable. A mounting stud is supplied for gear and spacer storage.
