What size pulley is used for 1/2 inch rope?

What size pulley is used for 1/2 inch rope?

• A. 1 inch
• B. 2 inch
• C. 3 inch
• D. 1.5 inch

Answer: (B)

The main idea here is using a pulley that’s large enough relative to the rope to prevent sharp bends and extra wear. A safe guideline is to keep the pulley diameter about four times the rope diameter. For a 1/2 inch rope, that means a pulley around 2 inches in diameter. This size minimizes bending stresses, reduces friction, and helps prevent heat buildup and rope damage over time. A 2 inch pulley hits that minimum ratio, making it the best fit. A smaller pulley would bend the rope more tightly and wear it faster, while a larger pulley is okay but not necessary for this requirement.

The main idea here is using a pulley that’s large enough relative to the rope to prevent sharp bends and extra wear. A safe guideline is to keep the pulley diameter about four times the rope diameter. For a 1/2 inch rope, that means a pulley around 2 inches in diameter. This size minimizes bending stresses, reduces friction, and helps prevent heat buildup and rope damage over time. A 2 inch pulley hits that minimum ratio, making it the best fit. A smaller pulley would bend the rope more tightly and wear it faster, while a larger pulley is okay but not necessary for this requirement.