ANCA CNC Machine Tools: Precision Engineering

The company built its reputation on tool and cutter grinding, then carried the same motion architecture into five-axis work. The base is heavy cast iron. Linear axes run on direct linear motors rather than ball screws, so there is no backlash to take up when the axis reverses. When a contour changes direction every few millimeters, that is where surface finish is won or lost.

Thermal behavior matters as much as motion. A grinding spindle running for six hours will grow. Active temperature control on the structural loop keeps the tool-to-workpiece relationship stable across a long run. For a batch of 200 reamers, that stability is the difference between the first and the last part measuring the same.

Software closes the loop. In-process probing and wheel-wear compensation adjust the path while the part is still in the chuck. Deflection prediction trims feed rates before the cutter starts to rub instead of cut. None of this replaces a good setup, but it removes a lot of the manual touch-off work.

The platform is strongest on parts with tight form tolerance and a modest envelope. Cutting tools, reamers, drills, end mills, medical burrs and small rotary instruments fit naturally. So do pump components, fuel injector bodies and optical mold inserts where the contour has to blend without a visible step.

Size is the first filter. Travel on these machines is measured in hundreds of millimeters, not meters. If your part needs a 4,000 mm envelope, this is the wrong platform, and we will route it to one of our large gantry machines instead. There is no point forcing a part onto a machine that cannot reach it.

Production volume is the second filter. One-off prototypes can run on a five-axis mill with less setup. The ANCA advantage shows up when you need 50 to 10,000 identical parts with sub-micron geometry, because the compensation logic keeps part 3,000 matching part 1.

Material is the third. Hardened tool steel, carbide, Inconel and titanium are routine. Soft plastics are not a good match for a grinding spindle, so those parts go to a standard mill or a router.

Every job starts with a DFM review. We look at wall thickness, tool reach, datum strategy and whether the tolerance stack can be held with the fixturing available. Most drawings come back with two or three notes, and we send that analysis within 12 hours of receiving the files.

Setup follows the datum scheme that the drawing actually uses. If the part is dimensioned from a bore, we locate on that bore, not on an outside edge that happens to be convenient. This is where a lot of shops lose tolerance before the spindle even turns.

Grinding wheel or cutter selection comes next. For hardened steel above 50 HRC we run CBN. For carbide we run diamond. The choice sets the achievable finish, and it sets how often the wheel needs dressing, which drives cycle time on longer runs.

In-process probing checks the part while it is still located. If a dimension drifts past the control limit, the machine compensates on the next pass rather than scrapping the part. Final inspection is 100% before shipment, with raw material check and in-process monitoring upstream of it.

Our working tolerance on these platforms is ±0.005 mm (±0.0002 in). That is the number we quote, and it is the number we inspect against. On a well-fixtured part with a stable datum, we can hold it across a full production run.

Surface finish depends on the operation. A ground surface lands at Ra 0.2–0.8 μm. A fine milled surface sits at Ra 0.8–1.6 μm. As-machined work is Ra 1.6–3.2 μm. Tell us the finish callout on the drawing and we will tell you which operation gets you there.

We hold ISO 9001:2015, IATF 16949:2016, ISO 13485:2016 and ISO 27001:2022. The medical and automotive certificates matter because they force a documented process, not just a good operator on a good day. Inspection reports are available on request.

Our first-pass qualification rate is 99.99%. That number comes from in-process monitoring, not from inspecting harder at the end. Catching drift during the cut is cheaper for everyone than sorting parts after the fact.