Wind Power

On-site machining, component restoration and maintenance services for wind power equipment

Wind turbines contain large, precision-critical mechanical components where geometry, alignment and surface condition are essential for reliable operation.

When wear, corrosion or mechanical damage affects a critical interface, replacing the complete component is not always the only solution.

PR Rolls provides on-site machining, dimensional restoration, surface engineering, measurement and balancing services for suitable wind power components.

Our capabilities include:

• On-site machining
• Line boring
• Milling and turning
• Grinding and precision finishing
• Shaft and journal repair
• Bearing seat restoration
• Bore restoration
• Flange machining
• Dimensional restoration
• Industrial coatings
• Measurement and alignment
• Field balancing
• Workshop refurbishment

The objective is to restore valuable components where technically appropriate and reduce unnecessary replacement of large industrial equipment.

Maintenance Challenges in Wind Power

Precision-critical equipment operating under variable loads
Wind turbines operate under continuously changing loads and environmental conditions.

Over time, wear, corrosion, vibration or mechanical damage can affect critical interfaces and rotating components.

• Typical maintenance requirements can include:
• Shaft and journal wear
• Bearing seat damage
• Worn or damaged bores
• Flange surface damage
• Corrosion
• Dimensional deviations
• Damaged sealing surfaces
• Misalignment
• Runout
• Vibration and imbalance

The appropriate repair method depends on what has deteriorated, how the component functions and which dimensions or surface properties need to be restored.

Inspect → Measure → Repair → Restore → Verify

On-Site Machining for Wind Power

Repair large components where they are installed
Large wind turbine components can be difficult and costly to remove and transport.

When technically feasible, portable machining allows damaged or worn surfaces to be restored directly at the maintenance location.

PR Rolls provides on-site machining capabilities including:

• Milling
• Turning
• Line boring
• Drilling
• Grinding
• Honing
• Precision finishing

On-site machining can support planned maintenance, component repair, installation, modernisation and corrective maintenance projects.

Instead of transporting a large component to a conventional machine shop, the machining technology can be brought to the component.

Shaft & Journal Repair

Restore worn rotating surfaces

Shafts and journals can develop localised wear, corrosion, fretting or mechanical damage while the main component remains suitable for continued service.

Depending on the component and damage, PR Rolls can combine:

• On-site turning
• Grinding
• Metallic coating
• Brush plating
• Dimensional restoration
• Precision finishing

The affected area can be rebuilt and finished to the required dimensions and surface condition.

This can provide an alternative to replacing a valuable complete component because of localised surface damage.

Bearing Seat & Bore Restoration

Restore critical mechanical interfaces

Accurate bearing seats and bores are essential for rotating machinery.

Wear, fretting or mechanical damage can change dimensions and affect the fit between components.

PR Rolls provides repair technologies for suitable bearing areas and bores, including:

• Line boring
• On-site machining
• Grinding
• Metallic coating or plating
• Dimensional restoration
• Precision measurement

Where material has been lost, the surface can in suitable applications be rebuilt before final machining restores the required geometry.

Line Boring for Wind Power Components

Restore bore geometry and alignment on-site

Large housings and structures can contain precision bores that are difficult to repair using conventional workshop methods without extensive dismantling.

Portable line boring allows suitable bores to be machined directly at the maintenance location.

Applications can include:

• Bearing housings
• Large machine bores
• Aligned bore systems
• Pin and pivot interfaces
• Other precision cylindrical interfaces

Measurement before and after machining provides a controlled process:

Measure → Establish reference → Machine → Verify

Flange & Mating Surface Machining

Restore flatness and geometry

Large mechanical connections depend on correctly machined mating surfaces.

Corrosion, mechanical damage or dimensional changes can affect the condition of flanges and other precision interfaces.

PR Rolls can provide on-site machining for suitable:

• Flanges
• Mating faces
• Mounting surfaces
• Sealing surfaces
• Large circular interfaces

Machining the surface where the component is located can reduce the need for transporting large structures to an external workshop.

Generator & Drivetrain-Related Components

Precision maintenance for critical mechanical interfaces

Wind turbine generators and drivetrain systems contain several precision interfaces where wear or dimensional damage can affect equipment operation.

PR Rolls' machining and surface restoration technologies can be applied to suitable components involving:

• Shafts and journals
• Bearing areas
• Bearing housings
• Bores
• Flanges
• Mounting surfaces
• Sealing areas
• Other precision mechanical interfaces

The service is determined by the component condition and required geometry, rather than by replacing the complete assembly as a first response.

Industrial Coatings & Dimensional Restoration

Rebuild worn surfaces and restore component dimensions

Surface deterioration does not always require replacement of the complete component.

PR Rolls provides industrial coating and surface restoration technologies for suitable components affected by:

• Wear
• Corrosion
• Erosion
• Fretting
• Dimensional loss
• Local surface damage

Depending on the application, restoration can combine:

Machining → Surface preparation → Metallic coating or plating → Grinding → Precision finishing

This makes it possible to restore both the dimensions and functional surface of valuable components.

Alternatives to Traditional Hard Chrome

Modern surface technologies for suitable applications

Traditional hard chrome plating has been widely used for wear- and corrosion-resistant industrial surfaces.

However, conventional hard chrome electroplating can involve hexavalent chromium, Cr(VI), in the manufacturing process.

PR Rolls provides carbide-based thermal spray coatings that can offer an alternative to hard chrome in suitable wind power and industrial applications.

Depending on operating conditions, HVOF and HVAF technologies can provide hard, dense and wear-resistant functional surfaces.

Potential applications can include:

• Shafts
• Sleeves
• Bearing areas
• Sealing surfaces
• Hydraulic components
• Other precision wear surfaces

The appropriate coating must always be selected according to component geometry, loading, operating environment and required surface properties.

Measurement & Alignment

Measure before machining and verify after repair

Precision repair begins with understanding the actual geometry of the component.

PR Rolls provides measurement and alignment services that can support wind power maintenance and repair projects.

Measurements can be used to:

• Determine existing geometry
• Identify dimensional deviations
• Establish machining references
• Measure runout
• Support alignment
• Verify repaired surfaces
• Confirm final dimensions

Combining measurement with on-site machining helps ensure that the repair addresses the actual mechanical condition.

Measure → Machine → Measure → Verify

Field Balancing

Correct imbalance in suitable rotating equipment

Imbalance can contribute to vibration, increased bearing loads and mechanical stress in rotating machinery.

PR Rolls provides field balancing and vibration-related measurement for suitable rotating industrial equipment.

Field balancing can be valuable when the component is difficult to remove or when balancing needs to be integrated into a maintenance project.

Where components can be efficiently removed, dynamic balancing can also be performed at the PR Rolls workshop.

Installation & Modernisation Support

Precision machining for new and upgraded equipment

Wind power maintenance is not limited to repairing worn equipment.

Installation, component replacement and modernisation can also create requirements for final machining and dimensional correction.

Portable machining can support suitable applications involving:

• Bore correction
• Flange machining
• Mounting surface machining
• Alignment-related machining
• Dimensional adjustment
• Final precision finishing

Performing the machining after installation can allow the final geometry to be established in the component's actual assembled condition.

Workshop Maintenance & Refurbishment

Complete restoration for removable components

Not every component needs to be repaired on-site.

Suitable removable components can be refurbished at the PR Rolls workshop.

Depending on the component, refurbishment can combine:

Inspection → Measurement → Mechanical repair → Machining → Grinding → Surface restoration → Coating → Precision finishing → Dynamic balancing

This provides two complementary approaches:

Large or installed equipment → On-site repair

Suitable removable components → Workshop refurbishment

Typical Wind Power Applications

PR Rolls' technologies can be applied to suitable precision-critical components used in wind power equipment.

Potential applications include:

• Shafts and journals
• Bearing seats
• Bearing housings
• Bores and aligned bore systems
• Flanges
• Mating and mounting surfaces
• Sealing surfaces
• Generator-related mechanical components
• Drivetrain-related mechanical components
• Hydraulic components
• Other large precision machine components

The deciding factor is not simply the name of the component.

The key question is what has deteriorated and which geometry, dimension or functional surface needs to be restored.

Planned Maintenance & Time-Critical Repairs

Combine multiple specialist services

Wind power maintenance can involve limited service windows and expensive component handling.

Where suitable, PR Rolls can combine several operations within the same project:

Inspection + Measurement + Machining + Grinding + Dimensional restoration + Alignment + Balancing

On-site capabilities can be particularly valuable when removing a large component solely for machining would add significant handling, transportation and project time.

The objective is to determine the most practical repair route based on the component and maintenance situation.

Repair, Refurbish or Replace?

Make maintenance decisions based on component condition

Localised wear does not automatically mean that an entire component has reached the end of its useful life.

Depending on condition, the appropriate strategy may be to:

Repair – correct local damage.

Machine – restore geometry and dimensions.

Restore – rebuild a worn functional area.

Recoat – renew or modify the functional surface.

Refurbish – restore the complete component.

Upgrade – adapt existing equipment to new requirements.

Replace – when restoration is no longer technically appropriate.

For large wind power components, this condition-based approach can help preserve the material, manufacturing and economic value already invested in the equipment.

Sustainable Maintenance for Wind Power Equipment

Extend the lifetime of existing components

Renewable energy equipment also requires maintenance, materials and replacement components throughout its operating life.

Extending the useful life of suitable existing components can therefore be an important part of responsible asset management.

PR Rolls supports this approach by restoring worn geometry and functional surfaces instead of automatically replacing complete components.

On-site machining can also reduce the need to transport large components to external workshops when the repair can be performed at the maintenance location.

Maintain → Repair → Restore → Extend lifetime

This is PR Rolls' approach to Sustainable Efficiency in industrial maintenance.

Why PR Rolls for Wind Power?

Combine portable machining with surface engineering

Wind power component repairs can require several technologies within the same project.

A worn shaft may require dimensional restoration and grinding. A bearing housing may require line boring. A damaged flange may require precision machining. A rotating component may require measurement, alignment or balancing.

PR Rolls combines:

On-site machining + Line boring + Grinding + Dimensional restoration + Industrial coatings + Measurement & alignment + Field balancing + Workshop refurbishment

The objective is to restore the component according to its actual condition and required function.

Inspect → Measure → Restore → Verify → Return to operation

Frequently Asked Questions About Wind Power Services

What services does PR Rolls provide for the wind power industry?
PR Rolls provides on-site machining, line boring, grinding, shaft and journal repair, bearing area restoration, dimensional restoration, industrial coatings, measurement, alignment and balancing for suitable wind power components.

Can wind turbine components be machined on-site?
Yes. Where component geometry, accessibility and working conditions allow, portable machining can be used to restore suitable components at the maintenance location.

Can worn shafts and journals be repaired?
Suitable worn areas can often be restored through machining combined with metallic coating, brush plating or other dimensional restoration technologies.

Can damaged bearing seats and bores be restored?
Yes. Depending on the damage, bearing seats and bores can be restored using technologies such as line boring, machining, dimensional restoration and precision finishing.

Can PR Rolls machine large flanges?
Yes. Portable machining can be used to restore suitable flange, mating and sealing surfaces without transporting the complete component to a conventional workshop.

Does PR Rolls provide field balancing?
Yes. PR Rolls provides field balancing for suitable rotating industrial equipment. Removable components can also be dynamically balanced at the workshop.

Can PR Rolls provide alternatives to hard chrome?
Yes. Carbide-based HVOF and HVAF thermal spray technologies can provide alternatives to traditional hard chrome plating in suitable applications. The correct solution depends on the component and operating requirements.

Restore Critical Wind Power Components

Large wind power components represent significant material, manufacturing and installation value.

When local wear, corrosion or dimensional damage occurs, PR Rolls combines on-site machining, line boring, shaft restoration, industrial coatings, measurement, alignment and balancing to determine whether the existing component can be restored.

From shafts and bearing areas to bores, flanges and other precision-critical mechanical interfaces, the repair begins with understanding the actual condition.

Inspect → Measure → Repair → Restore → Verify → Return to operation

Contact PR Rolls to discuss an upcoming wind power maintenance, component repair or modernisation project.