Gear and Pulley Kit

Gear trains appear in most mechanisms that need to change the speed or torque of a rotating component. This kit covers spur gears, planetary trains, worm gears, pulley-cable systems, and differential gears, all on a common working-panel format.

Each configuration can be assembled, measured with a caliper, and analysed. Students compare the theoretical gear ratio against the measured one, and work through the standard tooth-geometry calculations.

Specifications

Working panels	40 × 40 cm
Spur gears	2 × 10-tooth (Pd 5, dp 2 in); 15-tooth (Pd 5, dp 3 in); 20-tooth (Pd 5, dp 4 in)
Planetary arm	3 in
Other gears	1 gear of a different diametral pitch; worm and worm-gear system
Spring	Extension spring 8.5 × 47 mm
Weight baskets	2
Bearings and fasteners	6 plastic ball bearings (22 mm OD / 6 mm ID), 1 bearing joint, 4 screws, 5 nuts

Learning outcomes

• Calculate, measure with a caliper, and compare gear tooth specifications (addendum, dedendum, circular pitch, etc.).
• Design and assemble a simple gear set for a given gear ratio.
• Design and assemble a pulley and cable system for a given velocity ratio.
• Measure the gear ratio of a simple gear set.
• Measure the different gear ratios of a planetary gear set.
• Measure the gear ratio of a worm and worm-gear system.
• Assemble, operate, and measure the gear ratio of a differential gear set.