Hoisting — Sheave Diameter Check
Sheave Diameter Check calculation for hoisting and winching work.
Every pass over an undersized sheave is a fatigue cycle the rope logs and never forgets — bending stress rises steeply below ~18:1, and rope life falls roughly with the CUBE of the deficit. When a rope keeps breaking wires at one spot, measure the sheave it runs over at that spot.
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.
Sheave Diameter Check 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 — Sheave Diameter Check
Hoisting — Sheave Diameter Check computes the governing relationship D_min = d × required ratio live as you type. Every pass over an undersized sheave is a fatigue cycle the rope logs and never forgets — bending stress rises steeply below ~18:1, and rope life falls roughly with the CUBE of the deficit. When a rope keeps breaking wires at one spot, measure the sheave it runs over at that spot. 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 — Sheave Diameter Check
- 1Enter your values — Rope diameter, Required D/d for this service (sensible defaults are pre-filled).
- 2Read the live results: Min sheave pitch diameter.
- 3Check the "with your numbers" line to see D_min = d × required ratio substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Hoisting — Sheave Diameter Check?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula D_min = d × required ratio 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 pass over an undersized sheave is a fatigue cycle the rope logs and never forgets — bending stress rises steeply below ~18:1, and rope life falls roughly with the CUBE of the deficit.
- ✓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 — sheave diameter check use?+
It evaluates D_min = d × required ratio, 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 pass over an undersized sheave is a fatigue cycle the rope logs and never forgets — bending stress rises steeply below ~18:1, and rope life falls roughly with the CUBE of the deficit. 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?+
Sheave Diameter Check calculation for hoisting and winching work. A free crane load, wind & rigging safety tool. When a rope keeps breaking wires at one spot, measure the sheave it runs over at that spot. 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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