Uptower See all →
Yaw Ring Teeth Repair Patented in-nacelle machining. The ring is repaired where it stands - no removal, no crane. Rotor Lock Repair Full rotor lock seat restoration in-nacelle. No component removal required. Bolt Removal & Thread Repair Failed or seized bolts removed and threads recovered without replacing the host component. Yaw Sliding Surface Repair On-site repair of worn yaw sliding surfaces. No yaw ring exchange, no crane. Yaw Gear Mounting Flange Repair Worn yaw gear mounting flanges and damaged threads repaired uptower. Brake Disc Repair Damaged brake disc sections milled out and replaced uptower. Generator Shaft Repair Worn generator shafts machined back to tolerance in place. No generator replacement.
Blade See all →
Blade Root Contact Surface Repair CNC-controlled machining of worn or damaged blade root contact surfaces. Blade Root Bushing Repair Restore damaged blade root inserts onsite, reducing downtime from months to days. Blade Surface Milling Repair 3D milling of damaged blade areas to an exact surface - uptower or on ground.
Support Structures & Flanges See all →
Monopiles & TPs Sub-millimetre flatness on monopiles and transition pieces. Precision machining performed before installation. Tower Flanges Tower section flange flatness restored on-site. No re-fabrication, no transport. Industrial Flange Machining Sub-millimetre flatness restored on site for industrial flanges on large production machinery. Sea Fastening Machining sea fastenings and towers stands to the required tolerances without transporting the structures to a workshop.
General Industry See all →
Machine Plane Restoration On-site machining of machine plane. Flatness restored within specs without disassembling the press. Line Boring Portable line boring for large bores in-situ. Heavy industry, marine, energy. Axle & Shaft Repair Worn or damaged axle and shaft journals restored on-site. No removal, no replacement.
Measurements See all →
3D Laser Tracker Measurement Portable laser tracker measurement of large components. Hole patterns, reference points, machine alignment and flange geometry - up to 0.05 mm. Easy-Laser Measurement Easy-Laser alignment and geometric measurement. Flange flatness, tilt, shaft and machine alignment - verified and documented on site. 3D Scanning Handheld ZEISS 3D laser scanning on site. Reverse engineering, CAD comparison, wear and damage analysis - metrology-grade digital documentation.
Custom Solutions Can't find your repair? We design bespoke solutions for unique geometries - wind or industry.
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Goliath
Flanges

Goliath

Mobile flange milling system for large-scale precision machining of tower flanges, monopiles and transition pieces.

Goliath is CNC Onsite’s flagship large-diameter flange milling system designed specifically for precision machining of wind turbine tower flanges, monopile flanges, and transition piece (TP) interfaces. It is the primary machine deployed when sub-millimetre flatness is required on the largest structures in the wind industry.

The machine operates directly at the structure onshore, quayside, or offshore eliminating the need to transport components to a workshop. Goliath delivers documented, measured results: on the first 7.5 metre flange of a recent offshore tower project it achieved 0.21 mm global flatness against a required 1.0 mm, where the common industry standard is 2.5 mm. Flatness on any given project is machined to the specification that project requires.

By replacing manual grinding and shimming with controlled CNC machining, Goliath delivers repeatable, documented results that support reliable bolted connections, reduce rework during assembly, and improve long-term structural performance. The process is particularly critical for offshore structures where even minor flange deviations affect bolt preload, structural fit, and fatigue performance over the turbine’s lifetime.

Goliath
Goliath
Goliath
Applications

WHERE WE USE IT

Monopile flanges

Sub-millimetre flatness machining on monopile flanges before offshore installation — eliminating rework and improving assembly efficiency.

Transition pieces (TPs)

Precision machining of TP-to-monopile interface flanges to the flatness the project specifies, performed at the fabrication facility or quayside.

Tower flanges

On-site restoration of tower section flange flatness — no re-fabrication, no transport, turbine stays in the field.

Sea fastenings

Machining of sea fastening and tower stand mounting surfaces on installation vessels and fabrication yards to required tolerances.

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