Reducing Multi-Process Lead Times for 316 Stainless Subsea Instrument Enclosures with Integrated 5-Axis CNC Milling and Wire EDM
The Challenge
A manufacturer supplying monitoring equipment for subsea inspection systems approached Strategic Innovations Dundee Ltd after experiencing production delays with a conventionally machined enclosure assembly. The component, manufactured from marine-grade 316 stainless steel, featured deep internal pockets, intersecting coolant passages, multiple angled mounting faces, precision sealing grooves, and several blind internal features that could not be accessed using traditional machining methods alone.
Previous subcontractors relied on multiple fixtures and repeated machine setups, increasing cumulative tolerance variation while extending production lead times. Thin wall sections measuring approximately 2.8 mm also introduced vibration during roughing operations, resulting in inconsistent surface finishes and unnecessary manual rework.
The client required a manufacturing strategy capable of reducing setup complexity while maintaining dimensional consistency across a low-to-medium production batch destined for offshore monitoring equipment. In addition, the completed parts required laser identification marking and partial mechanical sub-assembly before shipment to minimise downstream production effort.
As an experienced provider of CNC machining Scotland manufacturers depend upon, Strategic Innovations developed a fully integrated machining strategy focused on process optimisation rather than additional inspection stages.
The Engineered Solution
Engineering review began with a complete analysis of the customer’s 3D CAD model to identify opportunities for reducing machining operations while improving overall process stability.
The raw material was first prepared using CNC precision turning to establish concentric datums and critical outside diameters before transferring directly into the company’s 5-axis CNC milling cell. By machining five faces within a single setup, engineers eliminated two secondary fixturing operations previously required during conventional machining.
Adaptive roughing toolpaths were programmed to maintain constant cutter engagement while reducing cutting forces on the thin wall sections. Variable step-over strategies and optimised tool projection lengths helped minimise tool deflection throughout deeper cavity machining.
Critical sealing faces and mating surfaces were then finished using high-performance carbide tooling with reduced radial engagement to consistently achieve surface roughness values approaching Ra 0.8 ÎĽm, meeting the client’s assembly requirements without secondary polishing.
Several internal profile features remained inaccessible using conventional milling. These were completed using EDM wire erosion Scotland capabilities, producing highly accurate internal geometries while eliminating mechanical cutting forces that could distort the finished component. The EDM process also ensured sharp internal corners and precision slot profiles impossible to generate using rotating cutting tools.
Additional mounting bushes required for the enclosure assembly were manufactured separately using CNC sliding head turning, enabling efficient production of small-diameter precision turned parts with excellent repeatability across the batch.
Following machining, every component underwent controlled deburring, edge preparation, laser marking, and cosmetic surface finishing. Strategic Innovations then completed the requested sub-assembly engineering, installing threaded inserts and assembling selected fastening hardware before packaging components into dedicated production kits.
By combining turning, milling, EDM, finishing, marking, and assembly under one roof, the company eliminated unnecessary transportation between specialist suppliers while simplifying production scheduling for the customer.
This integrated manufacturing approach reflects the practical engineering expertise that has positioned Strategic Innovations as a trusted partner for subcontract manufacturing UK customers requiring technically demanding precision components.
The Outcome & Operational Impact
The revised manufacturing process delivered measurable improvements throughout the project lifecycle.
Consolidating multiple machining stages into a single 5-axis CNC milling setup reduced overall setup time by approximately 42%, while optimised machining strategies shortened total production lead time by 28% compared with the client’s previous manufacturing route.
Finished sealing surfaces consistently achieved Ra 0.8 ÎĽm, reducing manual finishing requirements and supporting reliable gasket performance during final customer assembly. The combination of precision turning, EDM processing, and integrated finishing also improved dimensional consistency across every production batch while reducing work-in-progress handling.
Perhaps most importantly, completing machining, laser marking, and sub-assembly engineering within one subcontract operation simplified procurement, reduced logistical coordination, and lowered overall project management overhead for the customer.
For manufacturers across Dundee, Aberdeen, Fife, Edinburgh, Glasgow, and the wider UK seeking advanced precision engineering Dundee capabilities, Strategic Innovations continues to deliver technically complex machining solutions focused on efficiency, precision, and dependable production performance.
Have a complex engineering component or production bottleneck? Send your technical specifications and RFQ straight to the engineering team at www.strategic-innovations.co.uk for a comprehensive manufacturing evaluation.
