| Material |
Steel (carbon, alloy), cast iron, brass, bronze, nylon, plastic |
| Common Types |
Spur Gear, Helical Gear, Bevel Gear, Worm Gear, Rack and Pinion, Planetary Gear |
| Tooth Profile |
Involute (most common), Cycloidal |
| Teeth Orientation |
Straight (Spur), Angled (Helical), Conical (Bevel), Screw-like (Worm) |
| Module / DP |
Metric (Module), Imperial (Diametral Pitch) |
| Pressure Angle |
Commonly 20° or 14.5° |
| Gear Ratio |
Ratio of driving gear teeth to driven gear teeth |
| Mounting |
On shafts using keys, splines, press fits, or bolts |
| Applications |
Gearboxes, automotive transmissions, industrial machinery, clocks, robotics |
| Advantages |
High efficiency, accurate motion transfer, compact design |
| Limitations |
Noise (spur gears), requires lubrication, wear over time |
