Center Distance ($C$):

$$C = \frac{b + \sqrt{b^2 - 32(D_l - D_s)^2}}{16}$$

Where:

• $C$ is the distance between centers of pulleys, mm.
• $b = 4L_s - 6.28(D_l + D_s)$
• $L_s$ is the available belt standard length, mm.
• $D_l$ is the diameter of the larger pulley, mm.
• $D_s$ is the diameter of the smaller pulley, mm.