How to calculate gear ratio from tooth counts
Use driven teeth divided by driver teeth, connect the result to shaft speed, and keep the ratio convention visible.
Read articleExact ratio guides
Gear ratio guides
Learn the ratio convention, compound multiplication, direction parity, and strict boundary between kinematics and gear design.
How to calculate a compound gear ratio
Multiply the driven/driver fraction for every external stage, reduce once, and count meshes separately for direction.
Read articleWhy gear ratio is not gear design
Tooth-count kinematics cannot establish module compatibility, center distance, strength, lifetime, efficiency, or safe speed.
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