Line boring is a precision machining process used to restore or accurately machine the internal diameter and alignment of bores.

It is commonly used when repairing worn or damaged pivot points, bearing housings and pin bores in excavators, loaders, cranes and other heavy machinery.

A cutting tool rotates inside the bore and removes material to produce the required diameter, geometry and surface finish.

A portable line boring machine uses a rotating boring bar, cutting tool, drive unit and support bearings to machine a bore without needing to transport the complete component to a machine shop.

The boring bar is aligned with the required machining axis and supported securely. A cutting tool is then fed through the bore to remove material in controlled passes.

Correct setup, alignment, tool selection and measurement are essential to achieving the specified dimensions.

Both processes machine internal cylindrical surfaces.

Line boring typically involves machining one or more bores along a common axis, often with a supported boring bar.

Conventional boring is a broader term covering internal machining on lathes, milling machines and other machine tools.

Portable line boring is especially useful for repairing large, assembled or difficult-to-transport machinery.

Excavator pin bores can become worn because of repeated loading, movement, contamination, inadequate lubrication or deterioration of pins and bushes.

Typical problems include oversized bores, ovality, damaged surfaces and misalignment.

The appropriate repair depends on the amount of wear, component condition and required tolerances.

Portable line boring equipment is commonly used for repairing:

• Excavator buckets, booms and dipper arms
• Wheel loaders and loading shovels
• Crane and telehandler pivot points
• Agricultural and forestry equipment
• Industrial bearing housings
• Other heavy plant and machinery

Suitability depends on bore size, access, alignment and the condition of the component.

Yes. Portable line boring equipment is designed for on-site and in-situ machining.

This can avoid the need to remove and transport large components to a conventional workshop.

The work still requires suitable access, secure machine mounting, adequate power and a safe working environment.

View our portable line boring machines .

The most important factors are the bore diameter, machining length, available access and required material removal.

You should also consider the boring bar diameter, support arrangement, available motor power and whether bore welding is required.

AJA Group can discuss your application and suitable S-Power equipment.

Contact us for machine selection advice .

The S-Power S-50 is a portable line boring and automatic bore welding system supplied in the UK by AJA Group.

The published standard kit includes a drive unit, control equipment, boring bars, supports, cutting tools and bore welding components.

Available machining dimensions depend on the kit and fitted accessories. Refer to the product specifications for the applicable working range.

View the S-Power S-50 kit and specifications .

Yes, provided the component is suitable for repair.

A worn or oval bore can often be machined to a consistent, accurately aligned diameter.

Depending on the extent of wear and the required final size, the repair may involve machining for an oversized bush or bore welding followed by machining to the specified dimension.

Structural condition and repair tolerances should be assessed before work begins.

Bore welding is a process used to deposit weld metal onto the internal surface of a worn bore.

The deposited material can rebuild the damaged surface before it is machined back to the required diameter.

Automated bore welding systems rotate and position the torch to apply weld metal around the inside of the bore.

Correct welding procedures, material compatibility and inspection are important for a sound repair.

Not always.

If a damaged bore can be machined to accept an appropriate replacement bush, bore welding may not be necessary.

Bore welding is often considered when material needs to be rebuilt before final machining.

The correct method depends on the original component specification, wear, material and required repair dimensions.

A boring bar is the rotating shaft that carries the cutting tool through the bore.

Portable line boring systems use bars of different diameters and lengths depending on the workpiece and machine setup.

AJA Group supplies S-Power boring bars and associated accessories, including 35mm and 50mm bar options.

Browse boring bars and kits .

Bar diameter should be selected with consideration for bore access, machining length, rigidity, tool clearance and available supports.

A larger bar can offer greater stiffness, but must fit within the workpiece and cutting arrangement.

Long machining spans may require additional support to limit deflection and vibration.

Contact AJA Group if you’re unsure which bar or support arrangement is suitable.

Certain portable line boring systems can perform flange facing when fitted with compatible accessories.

Flange facing tools machine flat or annular surfaces, such as mounting faces and certain flange sealing surfaces.

AJA Group supplies flange facing equipment for compatible S-Power boring bar arrangements.

Browse our machining accessories .

AJA Group Ltd supplies S-Power portable line boring machines in the UK from its premises near Doncaster, South Yorkshire.

As the exclusive UK distributor for S-Power, AJA Group supplies line boring machines, bore welding equipment, boring bars, tooling, accessories and spare parts.

Customers can order suitable products through the website or contact the team for quotations and technical guidance.

Shop portable line boring machines .

The price depends on the machine model, included equipment, machining capacity and any additional tooling or bore welding accessories.

AJA Group publishes prices for many of its S-Power machines and accessories through the online shop.

For an accurate quotation, confirm which boring bars, tooling, power options and welding equipment are required.

View current machinery prices .

Yes. AJA Group provides UK-based sales and technical support for S-Power equipment, together with a range of replacement components, accessories and consumables.

Customers can contact the Doncaster team for help identifying compatible parts or discussing equipment requirements.

Availability varies by item, so contact AJA Group to confirm specific components.

Contact our technical support team .

AJA Group welcomes enquiries from customers interested in seeing S-Power machining equipment demonstrated.

Contact the team to discuss the machine you’re interested in and arrange a suitable appointment at the Doncaster premises, subject to equipment availability.

Enquire about a machine demonstration .