Belarus CNC Precision: What Engineers Should Specify

Precision starts with a number on the drawing. For most machined features we hold ±0.005 mm on critical dimensions, which is roughly ±0.0002 in. That band is achievable on a 16-station five-axis setup with temperature-controlled coolant, but it is not free. Every feature you tighten adds measurement time, and measurement time is where a quote grows.

Not every dimension needs that band. A mounting boss that bolts to a casting usually works fine at ±0.05 mm. Save the tight tolerance for the features that set fit: bearing bores, dowel holes, sealing faces, and anything that locates another part. Loose the rest, and the part stays affordable.

Surface finish moves with tolerance. A bearing bore at ±0.005 mm typically needs Ra 0.8–1.6 μm or better. A bracket face at ±0.1 mm is fine at Ra 1.6–3.2 μm. When you spec both a tight tolerance and a fine finish on a non-functional face, you are paying twice for nothing.

• 1
  Tight featuresBearing bores, dowel holes, sealing faces, locating shoulders.
• 2
  Loose featuresClearance holes, mounting bosses, non-mating outer profiles.
• 3
  Finish pairingRa 0.2–0.8 μm only where a seal or bearing runs.

Three-axis machining moves the tool in X, Y, and Z. That covers most prismatic parts, and it is faster and cheaper per part. The limit shows up when a feature faces a direction the spindle cannot reach without a second setup. Undercuts, deep cavities, angled ports, and contoured surfaces all force either a fixture change or a different process.

Each additional setup adds error. The part moves, the fixture clamps again, and the datums shift by a few microns. On a part with four setups, those microns stack. Five-axis machining adds two rotary axes so the tool reaches the feature in one setup. The datum stays put, and the geometry stays tied to a single origin.

We run 16 simultaneous five-axis machining centers with a Ø400 mm rotary table and travels up to 4,000 × 400 × 150 mm. That covers impellers, turbine housings, medical instrument bodies, and automotive structural nodes. For a simple plate with holes on one face, three-axis is the right call and we will quote it that way.

• 1
  Use five-axisContoured surfaces, undercuts, angled ports, multi-face features.
• 2
  Stay three-axisFlat plates, simple pockets, holes on one or two faces.
• 3
  Watch the datumFewer setups mean fewer stacked errors.

Aluminum is the easy one. 6061-T6 and 7075 machine clean, hold ±0.005 mm without drama, and take anodizing well. Thin walls below 1 mm start to deflect, so we adjust speeds and step-downs rather than promise a number the part cannot keep.

Stainless 304 and 316 move more. They work-harden, they hold heat, and a deep pocket can pull a few microns as the tool wears. 17-4PH in the H900 condition is stable and holds tight bores well, which is why it shows up in pump and valve parts. 303 is the free-machining grade when finish matters more than corrosion.

Titanium and Inconel are a different conversation. TC4 (Ti-6Al-4V) holds ±0.01 mm reliably on most features, but tool wear is real and cycle times run long. Inconel is worse. We quote those parts with a machining strategy attached, not a single number. Plastics like PEEK and POM move with temperature, so we machine them at controlled room temperature and inspect after they settle.

• 1
  Aluminum6061-T6, 7075, 2024, 6082 — tight tolerances, low risk.
• 2
  Stainless303 for finish, 316L for corrosion, 17-4PH for strength.
• 3
  Hard alloysTC4 and Inconel hold ±0.01 mm; expect longer cycles.
• 4
  PlasticsPEEK, POM, PC — inspect after thermal settling.

A tolerance on a drawing is a claim. An inspection report is evidence. We check raw material on arrival, monitor dimensions in process, and inspect 100% of parts before shipment. Reports go out on request with the shipment, and they list the measured value against the nominal and the tolerance band.

For Belarus-bound projects, the report matters as much as the part. Customs and incoming quality both want traceability. We record the material lot, the machine, the operator, and the inspection method. If a dimension is borderline, we flag it before it ships rather than let it arrive as a surprise.

Our historical qualification rate is 99.99% across shipped lots. That number comes from catching deviations in process, not from inspecting harder at the end. The earlier a drift shows up, the cheaper it is to fix.

• 1
  Raw materialCert check and hardness verification on arrival.
• 2
  In processDimensional monitoring at set intervals per feature.
• 3
  Final100% inspection before shipment; report on request.

Send a STEP file and a 2D drawing with tolerances. Within 12 hours you get a quote and a free DFM analysis that flags features we cannot hold as drawn. Production can start within 24 hours of approval, and parts ship in 3–5 days for most jobs. Historical late-delivery probability sits below 2%.

There is no minimum order quantity. One prototype and a 10,000-part run go through the same quoting path. For low-volume work we often machine from billet; for higher volumes we will suggest tooling or casting if the geometry supports it. The DFM note tells you which route is cheaper.

Uploads are secure and confidential. We sign NDAs on request, and we hold ISO 27001:2022 for information security alongside ISO 9001:2015, IATF 16949:2016, and ISO 13485:2016. If your program is medical or automotive, the paperwork is already in place.

We are GreatLight, founded in 2011, with three wholly-owned plants, 7,600 m² of floor space, 150 technicians, and 127 high-precision CNC machines across Dongguan and a Singapore factory. The capacity is there. What matters more is whether the process fits your part.

• 1
  SendSTEP + 2D drawing with tolerance callouts.
• 2
  Get backQuote and DFM analysis within 12 hours.
• 3
  StartProduction within 24 hours of approval.