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Lesson 01 / Gears
Two gears. One connection.
External gear pairPredict
Pitch-circle schematic. Circles touch where teeth mesh; teeth are omitted. Animation shows relative speed.
Make a prediction to unlock the controls.
Make a prediction Change one value
01 / Make your prediction
Gear A turns clockwise at 60 rpm. How does gear B turn?
Try both steps: make a prediction, then change a value.
Assumptions & model limits
Two external gears on fixed, parallel shafts, with matching tooth size and no slip. Pitch radii are proportional to tooth counts. No idler gears, internal gears, losses or acceleration are modeled. The animation is illustrative; use the displayed values for calculation.
Original pilot practice, not real exam questions. Content has not yet been independently expert-reviewed. Simplified models are for learning, not real-world equipment design or safety decisions.