Block and Tackle and Chain Fall Simulator

CREWFORGE · MILLWRIGHT EXAM PREP

PARTS OF LINE SUPPORTING THE MOVING BLOCK (n)

LEAD LINE LEAVES THE

SHEAVE FRICTION

Load weight (W)

Line pull, with friction (P)

Ideal pull W ÷ MA

Ideal MA (n)

Sheaves (S)

Actual MA W ÷ P

Efficiency

Pull in kN

Load rise

Lead line travel

Work in P × travel

Work out W × rise

Lost to friction (work in − work out)