Recent Blogs
Block and Tackle Mechanism: How It Works, Parts, Formula, and Mechanical Advantage Explained
How a Block and Tackle multiplies lifting force using rope and pulleys. Mechanical advantage formulas, rigging examples, and real sailing and crane applications.
White's Pulleys Mechanism Explained: How a Single-Rope Stepped-Sheave Tackle Works
Explore pulley effort and rope travel using an entered mechanical advantage and efficiency. The simplified support-force sum is not an anchorage rating.
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.
Spanish Barton (form 1) Mechanism Explained: 5:1 Compound Pulley Diagram, Parts and Uses
How the Spanish Barton form 1 tackle works, its 5:1 mechanical advantage, rigging formula, and worked example for lifting heavy loads in arborist and rescue...
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.
Movable Pulley with Counterweight: Exact Balance and Travel Ratio
Explore an ideal counterweighted movable pulley. Calculate line tension, counterweight mass, two-to-one travel and load imbalance for two vertical supporting legs.
Single Movable Pulley: Ideal Rope Tension and Displacement Geometry
Calculate ideal rope tension, vertical force ratio and local load rise for a single movable pulley with symmetric rope segments. Includes an animated force model.
Block and Tackle: Supporting-Parts and Ideal Work Ledger
How a Pulley works, with the formula, real industrial examples from cranes to elevators, and engineering tradeoffs vs gears, levers and hydraulics.
Differential Pulley Mechanism: How It Works, Diagram, Formula and Uses Explained
Trace the endless chain in a Weston differential pulley. Compare upper-wheel diameters and calculate signed hook travel and the ideal force ratio.
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.