Hoisting — Parts of Line & Line Pull
Parts of Line & Line Pull calculation for hoisting and winching work.
Every sheave eats a percent or two — at 8 parts the winch pulls ~8% more than the ideal W/n, and on worn bronze bushings far more. Reeving up also divides hoist SPEED by the part count: the same trade-off written twice, once in force, once in time.
Formula
Note: Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
Parts of Line & Line Pull calculation for hoisting and winching work. A free crane load, wind & rigging safety tool — no sign-up, no upload, instant results in your browser.
About Hoisting — Parts of Line & Line Pull
Hoisting — Parts of Line & Line Pull computes the governing relationship P = W / [e(1−eⁿ)/(1−e)] — friction-corrected reeving live as you type. Every sheave eats a percent or two — at 8 parts the winch pulls ~8% more than the ideal W/n, and on worn bronze bushings far more. Reeving up also divides hoist SPEED by the part count: the same trade-off written twice, once in force, once in time. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Hoisting — Parts of Line & Line Pull
- 1Enter your values — Hook load, Parts of line, Sheave efficiency each (sensible defaults are pre-filled).
- 2Read the live results: Required line pull, Frictionless pull (W/n).
- 3Check the "with your numbers" line to see P = W / [e(1−eⁿ)/(1−e)] — friction-corrected reeving substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Hoisting — Parts of Line & Line Pull?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula P = W / [e(1−eⁿ)/(1−e)] — friction-corrected reeving with authoritative sources cited on the page (Wire Rope Technical Board — Wire Rope Users Manual, 4th ed.; ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices)
- ✓Every sheave eats a percent or two — at 8 parts the winch pulls ~8% more than the ideal W/n, and on worn bronze bushings far more.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the hoisting — parts of line & line pull use?+
It evaluates P = W / [e(1−eⁿ)/(1−e)] — friction-corrected reeving, exactly as published. Sources: Wire Rope Technical Board — Wire Rope Users Manual, 4th ed.; ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Every sheave eats a percent or two — at 8 parts the winch pulls ~8% more than the ideal W/n, and on worn bronze bushings far more. Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
When is this calculator the right tool for the job?+
Parts of Line & Line Pull calculation for hoisting and winching work. A free crane load, wind & rigging safety tool. Reeving up also divides hoist SPEED by the part count: the same trade-off written twice, once in force, once in time. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
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