Latest posts
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Using Pulleys With Small-Diameter Rope or Cord: Sheave Fit, Jamming and System Compatibility
Small cord is convenient. It coils tight, it weighs nothing, and a 100 m spool of 6 mm accessory cord takes up less pack space than 30 m of 11 mm low-stretch rope. That convenience is exactly why it ends up threaded through pulleys that were never designed for it — tool-hoist lines through a…
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Pulley Efficiency: What the Numbers Mean
A pulley’s stated efficiency is not a marketing number — it changes the force a hauling team has to produce, the load the anchor actually sees, and whether a 4:1 on paper behaves like a 4:1 on the rope. On site the practical questions are simple: how much of the hauler’s effort reaches the load,…
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Choosing Connectors for Hauling and Pulleys
In a hauling system, the connector between the pulley and the anchor is one of the most heavily loaded components on the site. Mechanical advantage multiplies the force the haul team applies, redirects add vector loads on top of that, and every one of those forces passes through a single piece of hardware whose shape…