Calculation guides

Understand reduction ratios, pulley speeds and motor torque with formulas, worked examples and practical limitations.

• What is the output RPM for a 10:1 reduction?

  Learn the reduction-ratio definition, calculate output RPM, combine simple gear stages and work backwards from a target speed.

• How pulley diameter changes driven RPM

  Identify driver and driven pulleys, use effective diameters, and calculate driven RPM or the diameter needed for a target speed.

• Calculate motor torque from kW and RPM

  Use shaft power and speed to calculate N·m, understand the 9550 constant, and distinguish rated torque from electrical input and gearbox output.