Advanced Bulk Rapid Prototyping Solutions

A single prototype can be adjusted part by part. Once the quantity reaches 50 or more, the process has to hold the same result without a human decision on every piece. Tool wear, thermal growth in the spindle, coolant temperature and the hardness spread inside one bar of 7075 all push dimensions in the same direction over a run.

The number that matters is not the best part in the batch. It is the spread. A ±0.005 mm tolerance achieved on part one is meaningless if part 180 sits 0.03 mm away. Batch runs need a stable process window: verified stock, indexed tools, warm-up cycles and in-process probing that flags drift before the parts are finished.

Fixtures decide how repeatable the run really is. A vise that locates on a rough casting face gives a different origin every load. Dedicated soft jaws, or a tombstone that holds eight parts at once, cut load-to-load variation and let the machine run unattended overnight.

Five-axis machining fits the middle ground between one-off prototyping and hard-tooled production. Setup count drops because the tool reaches five faces in one clamping, so position error from re-fixturing does not multiply across 300 parts. Our 16 simultaneous 5-axis centers run the same program for a batch that a 3-axis shop would split across four operations.

Cycle time is where batch economics are won. Toolpaths get reworked for bulk: high-feed cutters, trochoidal roughing, and one finishing pass instead of three. On aluminum housings that change alone often takes 20 to 30 percent off the per-part cycle. The savings stay real only if the reworked path still holds the drawing tolerance, so we verify the first article before the run is released.

Size sets the machine. Our 5-axis travel covers 4,000 × 400 × 150 mm for long parts such as extrusion rails, and 750 × 1,150 × 550 mm or 600 × 600 × 600 mm for mid-size plates and housings. A Ø400 mm rotary table handles round work. Parts beyond those envelopes are quoted on a different route rather than forced onto a machine that cannot reach the feature.

Hard materials change the plan. Ti-6Al-4V and Inconel cut slowly and wear tools fast, so batch cost is dominated by tool life, not by machine time. We plan roughing with ceramic or carbide inserts and leave stock for a single finishing pass, which keeps the last 0.1 mm predictable across the run.

Not every batch belongs on a mill. Vacuum casting makes sense for 20 to 50 polyurethane parts from a silicone tool when the geometry is thin-walled and the surface needs to look like injection molding. Custom 3D printing covers lattice, internal channels and organic shapes that a cutter cannot reach, and it is the faster route when the part count is below roughly 30.

Sheet metal fabrication handles brackets, chassis panels and enclosures where the part is essentially a folded or stamped blank. Metal die casting takes over above several thousand units when the wall thickness is uniform and the tooling cost can be spread. Mixing routes inside one program is normal: a machined aluminum frame, a printed duct and a formed steel bracket can ship as one kit.

The decision rule is geometry and quantity, not preference. Deep pockets, tight bores and flat sealing faces go to CNC. Hollow closed volumes go to printing or casting. If a part needs both, machine the critical faces after the near-net process rather than printing the whole thing to tolerance.

We quote the alternatives instead of pushing one process. If a design will be cheaper as a casting at 5,000 pieces, it is worth saying so before 500 parts are machined.

Buying the whole batch of stock at once is the cheapest way to remove material variation. One heat number keeps hardness, machinability and anodize response the same from the first part to the last. Aluminum grades we run daily include 6061, 7075, 2024, 5052, 6082 and ADC12; stainless covers 303, 304, 316L, 17-4PH and 440C; titanium work is usually TA2 or TC4.

Finish is a separate process with its own spread. Anodizing builds a coating that grows into the tolerance, so masking and rack position matter on thin walls. Bead blasting gives a matte look but can round a sharp edge by 0.05 mm. We plan the finish before machining and adjust the pre-finish dimension accordingly.

Colour matching is the hard part in anodize. Two batches dyed weeks apart can differ by a shade even with the same alloy and rack. When a customer needs 500 matched covers, we run them through one dye lot and keep spares from that lot.

For functional surfaces, we hold Ra 0.2–0.8 μm on sealing and bearing fits, Ra 0.8–1.6 μm on general mating faces, and leave Ra 1.6–3.2 μm as-machined where appearance does not matter. Laser marking is available down to 1.5 mm character height for part traceability.

Inspection at batch scale is a sampling problem. We check raw material certificates on arrival, monitor dimensions in process, and inspect 100 percent of parts before shipment. Where a feature is critical, the report lists the actual measured value rather than a pass mark.

Certification scope matters to regulated buyers. Our quality system is certified to ISO 9001:2015, IATF 16949:2016, ISO 13485:2016 and ISO 27001:2022, which covers automotive, medical device and information security requirements. That means the paperwork trail exists before a customer asks for it.

Process capability is tracked, not assumed. Our historical qualification rate is 99.99 percent, and the late-delivery probability on record is below 2 percent. Neither number replaces a first-article inspection on your drawing.

Uploads are treated as confidential and an NDA is available on request. We do not publish customer names or part programs.

A quotation and a free DFM analysis come back within 12 hours of receiving drawings and quantity. The DFM note points out features that will be expensive in bulk: a 0.4 mm internal corner that needs a 0.3 mm cutter, a deep slot that forces a long reach tool, a thread that breaks into a thin wall.

Production can start within 24 hours of approval. Standard parts ship in 3–5 days depending on quantity and finish. There is no minimum order quantity, so the same program runs one piece or 10,000.

Capacity is spread across 127 high-precision CNC machines in three wholly-owned plants covering 7,600 m², with 150 technicians and a second site in Singapore. That spread is what allows a 1,000-piece run and a one-off repair to sit in the same week.

Send the drawing, the quantity and the critical dimensions. We will tell you which route is cheaper and where the risk sits.