### Pulley Calculator. RPM, Belt Length, Belt-Surface Speed ...

For example, if your small pulley is 80mm diameter, and spins at 1000 RPM, and you need to find the second pulley size to spin it at 400 RPM, Enter Pulley1 Size 80, Pulley 1 RPM 1000, Pulley 2 RPM 400, and hit Calculate to find the second pulley diameter.

### Linear Measurement > Encoder Products

Linear Measurement. Rotary encoders are widely used to provide feedback for linear measurement. As the encoder generates pulses in response to linear displacement of the material or object to be measured, it is a matter of simple math for the receiving device to convert those pulses into distance.