What we engineer on a knuckle boom crane

Take the whole machine or single work packages.

Boom and jib structure

Main boom, knuckle jib and their pivots as welded plate structures: section sizing, plate thicknesses, weld details and lifting points for assembly.

Pedestal and slewing

King post or pedestal, slewing bearing selection, bolt calculation and the foundation loads your yard or naval architect needs for the deck.

Load cases and load chart

Working load against radius, in-service and stowed conditions, with the dynamic factors of the rule set you name. Delivered as a load chart and a calculation report.

Strength, buckling and fatigue

Hand calculation and finite element analysis of the structure, pins and cylinder mounts, with assumptions and results written so a surveyor can follow them.

Hydraulic system

Luffing and knuckle cylinders, slewing drive, winch drive, power unit and valve sizing, with the circuit diagram and component list.

Winch, rope and hook

Hoisting winch arrangement, rope and sheave selection, reeving and hook block, fitted to the duty and the space on the boom.

What you receive

A package your purchasing, production and certification people can work from.

3D CAD modelNative and neutral formats, built to your CAD standard

Manufacturing drawingsPart, weldment and assembly drawings with tolerances and weld details

Bill of materialsStructured to import into your ERP

Calculation reportLoad cases, method and results against the standard you name

FEA reportStrength, buckling and fatigue, with load cases stated

Hydraulic schematicCircuit diagram, component list, sizing

Technical documentationSpecification, manuals, technical file content

Engineering animationOperating sequence for tenders and design reviews

If you need the crane built as well

Most clients want engineering only. Some want one party responsible until the machine is on the truck. You choose how far we go.

Engineering only

You receive the complete design package and build it in your own works or with your own suppliers.

Engineering with production follow-up

We stay on the project while it is built: supplier questions, drawing revisions, inspection of critical welds and dimensions, factory acceptance test.

Engineering and manufacturing

We have the equipment fabricated, assembled and tested by qualified workshops to our drawings and under our technical supervision, and deliver it to you with its documentation.