This article provides an online calculator for the **Belt or Roller Mechanism** to quickly find the servo’s electronic gear ratio and provide additional simulation information to evaluate whether the system parameters meet the requirements. The steps are as follows:

- Define
**user units**(PUU), eg, How many PUUs correspond to 1 mm - Enter the mechanical
**Reduction ratio**(1:1 without deceleration) - Enter the
**diameter**(D) or**circumference**of the pully, including the belt. - Enter
**Encoder Resolution**(PLS), PLS number per turn of the Encoder,ie,when the electronic gear ratio is 1:1, how many PUUs the drive has to receive in order to rotate 1 turn. - Press the “
**Calculate**” button to get the numerator and denominator of the E-Gear Ratio - Select “
**Significant digit number**“: to specify the numeric width of the numerator, suggest 6 or above [Note 1]. - Enter the
**Line Speed**(V) of the machine to check if the simulation results meet the requirements ?