How to design interacting or meshing gears of different diameters, identify which characteristic controls the gear ratio and why the module is important. The relationship between addendum and dedendum in terms of clearance is also discussed.

This video details characteristics of gear design including the top land, face, flank, bottom land, gear tooth profile, pitch circle, circular pitch, dedendum, addendum, whole depth, addendum circle, clearance circle, root circle, base circle, pressure angle, line of action and angle of interaction.