The formula to calculate the actual load applied to the pulley shaft is:

\[ L_a = f_b \cdot F_t \]

Where:

• \(L_a\) is the actual load applied to the pulley shaft in kgf.
• \(f_b\) is the belt factor (2 to 2.5 for V-belt, 2.5 to 5 for flat belt, 1.25 to 1.5 for chain drive).
• \(F_t\) is the effective force transmitted by the belt or chain in kgf-mm.