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 Refurbishment On-site refurbishment of worn yaw sliding surfaces. No yaw ring exchange, no crane. Yaw Gear Mounting Flange Repair Worn yaw drive 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 Repair Restore damaged blade root inserts onsite, reducing downtime from months to days Blade Root Bushing Replacement Worn or fatigued blade root bushings replaced in-situ without scrapping the blade. Blade Surface Milling 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. Sea Fastening Machining sea fastenings and towers stands to the required tolerances without transporting the structures to a workshop.
General Industry See all →
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. Industrial Flange Machining Sub-millimetre flatness restored on site for industrial flanges on large production machinery.
Measurements See all →
Easy-Laser Measurement Easy-Laser alignment and geometric measurement. Flange flatness, tilt, shaft and machine alignment - verified and documented on site. Laser Tracker Measurement Portable laser tracker measurement of large components. Hole patterns, reference points, machine alignment and flange geometry - up to 0.05 mm. 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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Flange Solutions

Support Structures &
Flange Solutions

Onsite precision machining of monopiles, transition pieces, tower flanges and sea fastening - restoring flatness, geometry and delivering tolerances well below industry requirements.

Flange Milling

Precision At Scale.

Welding heat can twist and bend large flanges, sometimes leaving flatness outside tolerance – just as offshore structures grow larger and tolerances tighten. We machine the flange flat after welding, where the structure sits – a controlled, repeatable alternative to heat straightening, with no transport to a workshop.

Goliath, our proprietary CNC-controlled flange milling system, together with our mobile machining systems, covers monopile and transition piece flanges, tower section flanges, sea fastening systems, and support structures such as tower stands and transport frames – from fabrication facilities to shipping ports and installation vessels.

  • Fully CNC-controlled machining replaces heat straightening – in most cases faster, with much better achievable tolerances
  • Flange flatness delivered down to 0.21 mm global across multiple projects, well below industry requirements
  • Mills flanges up to 10 metres in diameter in standard configuration, configurable up to 12 metres
Structures & Flanges services

Everything we do for Structures & Flanges

  • <0.2mm or 1mm globally flatness tolerance
  • Up to 10m Flange diameter
  • On site Or workshop-based
Speak to an engineer

Get expert advice on your project

Send us your damage report or turbine type and we'll respond within one working day with an assessment and indicative quote.

Jesper Nielsen
Your direct contact Jesper Nielsen +45 31 47 67 48 jen@cnconsite.dk

Damage photos help - email them directly or attach them when we reply.

Flange Milling

Why Choose CNC Onsite for Flange Milling

  1. 01

    Industry-Leading Flatness

    Achieve sub-millimetre flatness on large-diameter flanges, with documented results down to 0.21 mm.

  2. 02

    Reduced Rework & Post-Processing

    Replacing manual rework with a controlled CNC machining process that delivers repeatable results and quality.

  3. 03

    Documented Precision At Scale

    Documented performance well beyond industry standards on the largest flanges in the wind industry.

  4. 04

    Reduced Lifecycle Costs

    Better flange fit helps reduce maintenance requirements, corrective actions, and future bolt-related issues.

Trusted by wind operators and OEMs across Europe and North America

  • Vestas
  • Siemens Energy
  • NextEra Energy
  • GE Vernova
  • Enercon
  • Nordex
  • EDF Renewables
  • Welcon
  • RWE
  • CS Wind
  • EEW
  • Muehlhan
  • Nicon Industries
  • Orsted
  • Cadeler
  • Vattenfall
  • Smulders
  • Windar
  • Titan Wind
  • SubC Partner
  • Semco Maritime
  • LM Wind Power
  • Iberdrola
  • Vestas
  • Siemens Energy
  • NextEra Energy
  • GE Vernova
  • Enercon
  • Nordex
  • EDF Renewables
  • Welcon
  • RWE
  • CS Wind
  • EEW
  • Muehlhan
  • Nicon Industries
  • Orsted
  • Cadeler
  • Vattenfall
  • Smulders
  • Windar
  • Titan Wind
  • SubC Partner
  • Semco Maritime
  • LM Wind Power
  • Iberdrola
Explore more

OTHER CNC ONSITE SOLUTIONS

Talk to our team

READY TO TALK ABOUT YOUR Structures & Flanges PROJECT?

Get a feasibility assessment and indicative quotation within one business day.

Discuss your project