Recent Blogs
Two Fixed and One Movable Pulley: Three-part Tackle Calculator
Explore the shown 3:1 tackle and compare haul force using an assumed per-sheave tension ratio. Results do not rate a lifting system.
Spanish Barton (form 2) Mechanism Explained: 5:1 Compound Pulley Parts, Formula & Rigging Uses
Spanish Barton form 2 rigging explained — how stagehands and riggers achieve 5:1 mechanical advantage with two single blocks to lift heavy loads safely.
Simple Lifting Pulley Mechanism: How It Works, Diagram, Parts, Formula and Uses Explained
Explore a fixed pulley with a continuous rope animation. Calculate effort from load and selected efficiency, plus the sheave-to-rope diameter ratio.
Movable-Pulley Cord System (d): Fixed-Redirect 2:1 Ledger
How a cord-and-movable-pulley system halves lifting force. Real worked example, mechanical advantage formula, and rigging examples for shop and field use.
Movable-Pulley Cord System (c): Standing-End and Haul-Line Ledger
How a cord-and-movable-pulley system halves lifting force in rigging, theatre, and workshop hoists. Mechanical advantage formulas, worked example, and diagrams.
Movable-Pulley Cord System (b): 2:1 Lift with Right-Angle Haul
Movable pulley systems with cord cut lifting force in half or better. See how riggers, theatres, and shipyards use them to hoist heavy loads with...
Movable-Pulley Cord System (a): Fixed 2:1 Reeving Ledger
Movable pulley systems with cord cut lifting force in half or more. Learn the mechanical advantage formula, real rigging examples, and design tradeoffs.
Mast-and-Gaff Hoist: Historical Arrangement and Geometry
Explore a mast-and-gaff hoist and calculate tip reach, tip height and ideal vertical rope distance from gaff length, angle, pivot height and shaft depth.
Yale-weston Differential Gear Hoist Mechanism Explained: How It Works, Diagram, Formula, and Uses
Explore the differential chain-hoist principle. Compare ideal lift per turn, radius difference and hand pull using an assumed efficiency.
Yale Duplex Hoist Mechanism Explained: Weston Brake, Duplex Pawls, Mechanical Advantage
Explore an ideal hand-chain-hoist model. Compare mechanical advantage, assumed hand pull and chain-fall load; results do not establish a lifting rating.
Safety Tackle Mechanism: How It Works, Parts, Diagram, Formula and Industrial Uses Explained
Safety Tackle explained — how the cam-and-pawl arrest mechanism stops a falling load on hoists, lifts, and mill drives. Engineering, formulas, and real examples.