Timing Belt Pulley Design Calculator

We can form the following definitions and equations:

\( N \) = Number of teeth on pulley.

\( P \) = Pitch of Belt (distance between teeth).

\( C_b \) = Circumference of belt.

\( D_b \) = Diameter of belt.

\( D_{po} \) = Outer Diameter of pulley.

\( D_{pi} \) = Inner Diameter of pulley.

\( T_b \) = Thickness of belt, measured from tooth valley to the flat side of the belt.

\( H_t \) = Height of the tooth on the belt.

Equations:

\( C_b = N \cdot P \)

\( D_b = \frac{C_b}{\pi} \)

\( D_{po} = D_b - 2 \cdot T_b \)

\( D_{pi} = D_{po} - 2 \cdot H_t \)

Inputs