#crane

Mobile-crane lift-planning maths as an API, computed locally and deterministically — the load-moment, tipping-capacity and outrigger-pad numbers a crane operator, lift planner or rigging engineer checks a pick with. The load-moment endpoint gives the load × its working radius (the horizontal distance from the slew centre to the hook), the single figure a crane's rated-capacity limiter watches: a 5-tonne load at 8 m is a 40 tonne-metre moment, the same as 10 tonnes at 4 m, which is why chart capacity falls steeply as the boom luffs out — moment, not weight, tips the crane. The capacity endpoint gives a simplified tipping balance about the fulcrum: the load that just tips = counterweight × its radius ÷ the load radius, and the rated safe load is a stability fraction of that (~75 % on outriggers, ~66 % on crawlers per the standards) — a teaching/sanity figure that ignores the boom and superstructure, never a substitute for the load chart. The outrigger-pad endpoint sizes the float: required pad area = the outrigger leg load ÷ the soil's allowable bearing pressure (and the side of a square mat), since overloading weak ground is a leading cause of overturns — a 30-tonne leg on 200 kPa wants about a 1.2 m square mat. Everything is computed locally and deterministically, so it is instant and private. Ideal for lift-planning and rigging tools, construction and crane-operations apps, and site-safety utilities. Pure local computation — no key, no third-party service, instant. Simplified — always use the manufacturer load chart. 3 compute endpoints. For sling and WLL loads use a rigging API.

api.oanor.com/crane-api

Rigging and lifting load maths as an API, computed locally and deterministically. The wll endpoint relates the working load limit to the minimum breaking strength through the safety (design) factor: give a breaking strength and it returns the working load limit (WLL = MBS ÷ safety factor), or give a working load limit and it returns the minimum breaking strength your hardware must be rated for (MBS = WLL × safety factor). The safety factor can be given directly or looked up by component — general rigging and wire rope 5, chain sling 4, shackle 6, personnel/man-rated 10. The sling endpoint computes the tension in each leg of a multi-leg sling as the lifting angle changes: because the legs pull at an angle, each carries more than its share, with a load factor of 1/sin(angle to horizontal) — 1.0 vertical, 1.15 at 60°, 1.41 at 45° and 2.0 at 30° — and it accepts the angle from horizontal, from vertical or the included angle between legs. The safety endpoint lists the typical design factors. Loads are given in kilograms, pounds, tonnes, kilonewtons or newtons and reported in all of them. Everything is computed locally and deterministically, so it is instant and private. A planning aid, not a substitute for a qualified rigger or the governing standard (ASME B30, EN, local code). Ideal for crane and lifting apps, construction and warehouse tools, theatrical and entertainment rigging, and towing and recovery calculators. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is rigging load maths; for the weight of the steel being lifted use a metal-weight API.

api.oanor.com/rigging-api