Uptower See all →
Private: Brake Disc Repair Damaged brake disc sections milled out and replaced uptower. Private: Generator Shaft Repair Worn generator shafts machined back to tolerance in place. No generator replacement. Private: Yaw Gear Mounting Flange Repair Worn yaw drive mounting flanges and damaged threads repaired uptower. Private: Yaw Sliding Surface Refurbishment On-site refurbishment of worn yaw sliding surfaces. No yaw ring exchange, no crane. 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.
Blade See all →
Private: Blade Surface Milling 3D milling of damaged blade areas to an exact surface - uptower or on ground. Blade Root Repair Restore damaged blade root inserts onsite, reducing downtime from months to days Private: Blade Root Bushing Replacement Worn or fatigued blade root bushings replaced in-situ without scrapping the blade.
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. 3D Laser Measurement 3D laser tracker and Easy Laser services. Alignment verification, quality control, dimensional inspection on-site. High precision measurement.
Measurements See all →
3D Laser Measurement 3D laser tracker and Easy Laser services. Alignment verification, quality control, dimensional inspection on-site. High precision measurement.
Custom Solutions Can't find your repair? We design bespoke solutions for unique turbine geometries.
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Private: Blade Root Bushing Replacement
Blade Solution

Blade Root Bushing Replacement

Replace fatigued root bushings without removing or scrapping the blade.

Request a quote How it works
M30 & M36 Bushing solutions verified
TNO + Fraunhofer Independent fatigue testing
UL Assessment statement issued
On site No blade transport required

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
How It Works

Bushing Replacement.

Without Scrapping The Blade.

Failed or fatigued blade root bushings used to mean scrapping the blade. Our CNC-controlled bushing replacement removes the old bushings and installs new ones on site - the blade is reused, not replaced.

How the repair works

A machine powered by Siemens CNC technology mounts directly on the blade root and mills out the worn bushings with very high precision. The same machine can reface damaged flange ends. New repair bushings and infusion technology, delivered by our partner We4Ce, complete the installation.

Built for the blade

  • Fully automatic and semi-automatic machine variants - installed directly on the blade and easy to operate
  • The repair runs on site - no blade transport, no disturbance of ongoing production
  • Addresses loose bushings, jammed or broken bolts and damaged flange ends
M30 & M36bushing solutions verified
TNO + Fraunhoferultimate and fatigue testing
ULassessment statement issued

A verified alternative to blade replacement

Test coupons have gone through extensive ultimate and fatigue testing at the TNO and Fraunhofer test institutes. UL's assessment indicates the repair concept can achieve higher pull-out strength than the original bushing and a lifetime sufficient for - or exceeding - the 20-year turbine design life, depending on site-specific conditions.

Technical Specifications
Machine control Siemens CNC
Machine variants Fully & semi-automatic
Verified bushing sizes M30, M36
Independent testing TNO & Fraunhofer
Assessment UL (IEC 61400-22)
Repair location On site, directly on the blade
UL AssessedTNO TestedFraunhofer TestedSiemens CNC
Reuse, Not Replace The blade stays in service. Old bushings are removed and new ones installed without scrapping the blade.
Reduced Downtime On-site repair with no blade transport and no disturbance of ongoing production.
Verified Results A fast and proven process, verified through independent ultimate and fatigue testing.
High Precision Fully CNC-controlled bushing removal and flange facing with very high precision.
Talk to our team

Get expert advice
on your project.

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

+45 70 11 02 70 info@cnconsite.dk

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

Global reach

Wherever your turbines stand

On site within days Worldwide call-out, 24/7. Technicians mobilize within days of a purchase order.
Onshore & offshore The same in-nacelle method works at sea - no offshore crane deployment needed.
Three continents A proven repair track record on wind turbines across three continents.
FAQ

Frequently asked questions

Can blade root bushings be replaced without scrapping the blade?

Yes. The old bushings are milled out and new ones installed directly on the blade, on site. The blade is reused instead of being replaced.

How is the bushing repair verified?

Test coupons have gone through extensive ultimate and fatigue testing at the TNO and Fraunhofer test institutes, and UL has issued an assessment statement for the repair concept. The M30 and M36 solutions have been verified.

What blade root damage can be repaired?

Loose bushings, jammed or broken bolts and damaged flange ends. The machine can also perform flange facing with very high precision.

Does the blade have to be transported to a workshop?

No. The machine is installed directly on the blade and the repair is performed on site, without disturbing ongoing production at the park.

Related Solutions

More blade services

Blades

Private: Blade Surface Milling

3D milling of damaged blade areas to an exact surface - uptower or on ground.

Learn more →
Blade Root Repair
Blades

Blade Root Repair

Restore damaged blade root inserts onsite, reducing downtime from months to days

Learn more →
More wind turbine solutions
Uptower Private: Brake Disc Repair Uptower Private: Generator Shaft Repair Uptower Private: Yaw Gear Mounting Flange Repair Uptower Private: Yaw Sliding Surface Refurbishment Uptower Yaw Ring Teeth Repair Uptower Rotor Lock Repair
All wind solutions →