DOMIN integrates STUDER S33 cylindrical grinder to achieve 0.0006mm tolerance on 3D-printed hydraulic valve spools

UK-based hydraulic technology company DOMIN has integrated a STUDER S33 universal cylindrical grinding machine at its Bristol Technology Centre to post-process metal 3D-printed valve spools. The company reports that the S33 achieves a diameter tolerance of 3 micrometers on its S6 Pro servo valve spools, with in-process measurement showing deviations of just 0.0006mm across more than 50 parts. This replaces a slower wire EDM edge-matching process, reducing machining time from nearly one hour to five minutes per part. DOMIN manufactures its spools from maraging steel using metal laser powder bed fusion (LPBF), then grinds the control edges to match the valve housing windows with micrometer-level precision.

This integration illustrates a critical but often overlooked segment of the AM value chain: post-processing economics. DOMIN's move from wire EDM to cylindrical grinding is not about replacing AM but about making it production-viable. The company's hydraulic valves - which claim up to 90% efficiency improvement over conventional designs - are now entering higher-volume production, and the S33 enables fully interchangeable spools and blocks without manual matching. This mirrors a broader pattern in industrial AM: as companies move from prototyping to serial production, the bottleneck shifts from the printer itself to the downstream finishing operations that determine part quality and cost. DOMIN's choice of a Swiss grinding platform also underscores that precision post-processing remains a domain where established machine-tool expertise still commands a premium.

For the AM industry, DOMIN's case is a practical reminder that production-scale metal AM rarely ends at the build chamber. The company's next step - automating part loading on the S33 - points to where the real scaling challenge lies. Buyers evaluating metal AM for hydraulic or fluid-power applications should examine not just the print capability but the entire process chain: powder handling, stress relief, support removal, and precision finishing. DOMIN's 5-minute grind cycle versus 60-minute EDM cycle is a concrete data point that separates production intent from lab capability.