Boring machining for the aerospace industry

precisionon sitehigh-precision

Overview
Precision boring and spot facing performed on aerospace primary and secondary structures, available on-site or in our Bordeaux workshop. Work executed to micrometric tolerances in compliance with manufacturer SRM. Includes fastener-hole rework and repair.

At a glance
Process: Precision boring & spot facing
Deployment: At customer site — 50+ countries · 24/7 AOG · Bordeaux workshop
Scope: Execution · process qualification · operator training · tooling supply

How it works
Precision boring is the re-boring of an existing hole to micrometric accuracy to restore dimensional tolerance, move to the next oversize after cold working, or create a high-precision mating surface. Spot facing (spot facing/seat milling) restores flange flatness and perpendicularity.
On aircraft structures these operations are carried out on-site with portable high-precision tooling (Rotabroach, Recoules, OEM-specific tools) operated by qualified structures technicians. Dimensional traceability (dial indicators, bore gauges) is mandatory for OEM compliance.

Typical applications

• Hole reworking after cold working: return to final size after the ~0.5–1.5% residual expansion
• Damaged hole repair: step up to the SRM-prescribed oversize after misalignment or rework machining
• Mating-surface refacing after removal and reinstall: restoring a joint's mating surface after repair
• Service Bulletin / AD modifications: additional or modified holes as part of OEM modifications

Accuracy (FAQ)
H7 to H8 tolerance routinely, H6 possible with dedicated tooling. Ovality < 0.02 mm on 25 mm thickness. Typical roughness Ra 0.8–1.6 µm.

Features / technical specifications

• Achievable tolerances: H7–H8 routinely; H6 possible with dedicated tooling
• Ovality: < 0.02 mm on 25 mm thickness
• Surface roughness: Ra 0.8–1.6 µm
• Deployment: On-site in 50+ countries; 24/7 AOG support; Bordeaux workshop
• Scope of services: Execution, process qualification, operator training, tooling supply
• Typical tooling: Portable high-precision tooling such as Rotabroach, Recoules and OEM-specific tools
• Measurement & traceability: Dial indicators, bore gauges for dimensional traceability
• Typical applications: Hole reworking after cold working; damaged hole repair; mating-surface refacing; SB/AD modifications