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Picture a solid block of 316L stainless steel large enough to contain a 350 mm impeller. In conventional production, that entire part is carved out of the billet, and most of the expensive alloy ends up as chips on the floor. For a precision house working with high-value materials under constant supply-chain pressure, that arithmetic is hard to justify.

GARY Mécanique de Précision has spent over 60 years solving exactly these kinds of problems. With deep expertise in precision machining, the company turned to additive manufacturing not as a novelty, but as a practical answer: a way to produce complex geometries, manufacture blanks in-house, and open the door to high-value repair and cladding work.

This case study follows one application that captures that philosophy in a single part: an open impeller with 316L stainless steel blades deposited onto a machined hub, produced using Meltio’s wire-laser metal deposition (LMD). It is a part relevant to anyone building turbomachinery or rotating components across energy, oil & gas, aeronautics, naval, and general industry.

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1. Supply-chain pressure and the cost of wasted metal

Manufacturers of rotating components face a squeeze that has only tightened in recent years. Raw material costs and availability are under pressure, while customers still expect competitive pricing and short lead times for increasingly complex parts.

Conventional manufacturing struggles to satisfy both demands at once. Producing a part like an open impeller the traditional way forces a choice between two costly routes, and neither is comfortable when the alloy is expensive and the schedule is tight.

For GARY Mécanique, the strategic answer was to bring blank production in-house. Being able to build a near-net-shape blank and then machine it on existing equipment delivers a meaningful advantage in both cost and lead time, while reducing dependence on an unpredictable supply chain.

2. Why conventional impeller production falls short

Open impellers are demanding parts, and the two standard manufacturing routes each carry a real penalty.

  • Machining from solid removes enormous volumes of material to reveal the blade geometry. For high-cost alloys, that excess stock is money turned directly into scrap, and the long machining cycles add cost and lead time.
  • Casting avoids the waste but introduces complex, expensive tooling, and that complexity escalates sharply for shrouded, closed impeller designs.

There is also a purely technical hurdle. The blades sit on a curved, non-planar hub, so any additive approach has to deposit material accurately onto a pre-machined, three-dimensional surface rather than a flat plate. Getting that “best fit” right is what separates a clean hybrid process from an unworkable one.

3. Hybrid wire-laser metal deposition on a machined hub

GARY Mécanique answered all three problems with a single hybrid workflow built around Meltio’s industrial wire-laser metal deposition technology.

The logic is simple and elegant. Rather than carving an impeller from a billet or wrestling with casting tooling, the team starts with a straightforward, pre-machined hub. Meltio’s metal 3D printing system then deposits the 316L blades directly onto that hub using a best-fit alignment, placing metal only where the geometry actually requires it. A light 1.5 mm finish-machining pass brings the blades to their final tolerances.

Wire-laser metal deposition is well suited to this role because it strikes a strong balance between deposition rate and print quality. Compared with arc-based processes such as wire-arc additive manufacturing (WAAM), the wire-laser configuration offers greater geometric accuracy and better material quality, while still delivering the deposition capability needed for large-scale parts. That combination is exactly what a 350 mm rotating component demands: enough throughput to be productive, with the precision to land blade profiles on a curved surface.

4. Less waste, less machining, fewer tooling headaches

Adopting Meltio’s wire-laser LMD reshaped the economics and the process at the same time.

Dramatically reduced machining

Final finishing is limited to a 1.5 mm pass, a fraction of the machining volume required to cut the same geometry from a solid billet.

Material efficiency

Metal is deposited only where it is needed, with no excessive stock. For expensive alloys, that translates into a direct reduction in material consumption, the single biggest lever on part cost.

Tooling simplified or eliminated

The hybrid route removes the need for complex casting tooling, which is especially valuable for difficult impeller geometries.

Shorter lead times and design freedom

Building blanks in-house compresses the schedule, and additive deposition gives engineers real geometric flexibility on blade profiles.

5. From open impellers to closed impellers, propellers, and repair

This open impeller is a proof point, not an endpoint. By pairing a machined hub with additive blade deposition, GARY Mécanique has shown how to produce parts that are difficult or uneconomical to make by conventional means, and the same logic scales outward.

The roadmap is already taking shape. Closed impellers, where casting is extremely complex, are a natural next target for a fully additive approach that needs no pre-machined blank. Propellers follow the same hybrid logic as the open impeller: a machined hub with deposited blades. And the repair and cladding of worn parts points toward a circular-economy model that industry is increasingly demanding — restoring high-value components instead of replacing them.

For manufacturers of rotating components weighing the cost of casting tooling against the waste of machining from solid, the Gary Mécanique and Meltio collaboration offers a third path: build smart, machine little, and waste almost nothing.

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