How to design a working steering rack, rack and gear or rack and pinion mechanism, understand how the pitch circle drives other factors. Identify which characteristics control the gear design and why the module, number of gear teeth and pressure angle are important. The relationship between addendum, base diameter, pitch diameter, clearance diameter and root diameter is also discussed.

This video gives a practical demonstration on how to detail the spur gear, involute curve, gear tooth profile, pitch circle, circular pitch, dedendum, addendum, whole depth, addendum circle, clearance circle, root circle, base circle, pressure angle and how it relates to rack design.