Professional bore repair, precision alignment, and heavy equipment machining across Nigeria — we bring the machine shop to your site.
Request a QuoteUnderstanding The Process
Line boring is a precision machining process used to restore, resize, or realign bore holes in heavy equipment and structural components. Over time, the pin bores in excavators, cranes, loaders, and other machinery wear out of round — causing vibration, abnormal movement, and accelerated damage.
Rather than replacing entire components at enormous cost, line boring restores the bore to its original specification — extending the machine's working life and returning it to full operational performance.
Returns out-of-round or oversized bores to precise OEM dimensions.
Re-establishes correct bore centreline alignment across multiple points.
Properly restored bores dramatically reduce ongoing wear and prevent further damage.
A fraction of the cost of replacing booms, frames, or structural components.
What We Offer
Precision bore repair and restoration for every type of heavy equipment — on-site or in our workshop.
Our portable self-aligning boring machines are transported directly to your construction site, mine, port, or facility. Equipment stays in place — no dismantling, no transport, no logistics delays. We set up, align, machine, and hand the equipment back to you operational.
Specialist bore restoration for construction and mining machinery. We work on the full range of heavy equipment, correcting wear and misalignment in boom, stick, bucket, and frame bores to return machines to full working specification.
Where bore surfaces are severely worn, we first rebuild the bore walls using high-quality MIG/TIG welding techniques before precision machining. This ensures there is sufficient material to achieve the correct finished diameter and surface quality.
Final precision boring ensures all bores are machined to exact diameter, roundness, and centreline alignment — guaranteeing smooth pin movement, correct clearances, and full restoration of the equipment's designed range of motion and load capacity.
Sectors We Serve
Our line boring and bore restoration services are trusted across Nigeria's heaviest industries.
How We Work
A structured, engineered approach that ensures precision and quality at every stage — from first assessment to final handover.
Our engineers arrive on-site and conduct a thorough inspection of all affected bores using precision measurement tools. We measure the extent of wear, out-of-roundness, and misalignment, then document the findings and confirm the machining scope before any work begins.
The portable line boring machine is positioned and rigidly mounted to the equipment frame. The boring bar is laser-aligned and calibrated to the bore's centreline axis, ensuring the cutting head tracks perfectly through all bore points before machining begins.
If bore walls are too worn to machine directly to the final size, our welding team builds up the bore surfaces using MIG or TIG welding. The weld is allowed to cool and stabilise, then ground back to near-dimension in preparation for precision boring.
The boring bar is engaged and the bore machined to the specified final diameter in carefully controlled passes. Feed rates and cutting depths are monitored throughout to achieve the correct surface finish, roundness, and diameter tolerance — typically within ±0.01mm of specification.
Once machining is complete, the bore is measured again with precision bore gauges and checked against the required specification. Pin fit is verified, alignment is confirmed, and a full inspection report is provided to the client before equipment is returned to service.
Our Arsenal
We use precision-aligned portable machining systems designed specifically for on-site heavy equipment restoration, backed by workshop-grade measurement and welding equipment.
Self-aligning hydraulic boring bars handling 40mm–600mm bore diameters directly in the field without equipment removal.
High-accuracy laser bore alignment tools ensuring boring bar centreline is set to OEM specification before any cutting begins.
Industrial welding systems for bore build-up, hard-facing, and structural repair — enabling restoration of severely worn surfaces.
Electronic and dial bore gauges measuring to ±0.001mm, used for pre-machining assessment and final dimensional verification.
Full suite of CMM tooling, dial indicators, feeler gauges, and surface finish measurement instruments for quality assurance.
Fully equipped field service vehicles carrying all tools, equipment, and spares needed for rapid on-site mobilisation across Nigeria.
Proven Results
Komatsu PC300 boom and stick pin bores severely worn. On-site portable boring bar deployed; all three bore points machined to OEM tolerance. Machine returned to active service within 18 hours of team arrival.
View Case Study →Offshore supply vessel's stern tube bore worn beyond serviceable limits causing excessive shaft vibration. Bore machined and aligned at berth eliminating dry-dock requirement and saving the client significant time and cost.
View Case Study →Critical crawler crane on an oil facility with worn slew ring mounting bores causing dangerous operational play. Full bore build-up, machining, and alignment completed on-site enabling the crane to resume safe heavy lift operations.
View Case Study →The AutoBore Advantage
Not all bore repair services are equal. Our combination of portable capability, precision tooling, experienced engineers, and nationwide reach makes us Nigeria's leading line boring specialists.
We come to you. No teardowns, no transport — your equipment stays on-site throughout the entire repair.
Every bore is machined to ±0.01mm tolerance — meeting or exceeding OEM specifications every time.
Our streamlined process and pre-mobilised teams mean most jobs are completed within 8–24 hours of arrival.
Over 20 years of precision machining experience across construction, mining, marine, and oil & gas sectors.
Mobile teams deployed across all 36 states — Lagos, Abuja, Port Harcourt, Warri, Kano, and everywhere in between.
Ready to Get Started?
Our engineers are mobilisation-ready. Tell us your location, equipment type, and the problem — we'll respond with a quote within 24 hours.