CNC Machining Services

General work: ±0.10 mm. Precision features: ±0.02–0.05 mm with proper fixturing and inspection. Ultra-tight (<±0.01 mm) is possible on limited features with CMM control, stable materials, and dedicated tooling—expect longer lead times and higher cost.

For unspecified dims on general parts, ISO 2768-m is a sensible default. Call out GD&T (ISO 1101 / ASME Y14.5) for critical features (position, flatness, parallelism). Avoid mixing standards on one drawing.

Metals: ≥1.0 mm for stable milling; plastics: ≥1.5–2.0 mm (material-dependent). Go thinner only with clear justification, extra fixturing, and relaxed surface requirements.

Match practical endmill sizes: R0.5–R1.0 is widely feasible. Smaller radii drive tool wear and cycle time. If you need a sharp corner, consider a relief slot (“dog-bone”) or post-process EDM on limited features.

• 3-axis: prismatic parts, open pockets.
• 4-axis: features around a cylinder or multiple sides in one setup (cost/time saver).
• 5-axis: compound angles, deep/complex surfaces, better accuracy by reducing setups.

Typical milled Ra ≈ 1.6–3.2 µm after standard finishing passes. Polishing or re-machining can reach ≤0.8 µm on selected faces. If you need cosmetic bead-blast + anodize, call out both and protect datum faces.

Anodize adds ~5–25 µm total (half growth, half penetration). Hardcoat is thicker. Electroplated layers (Ni/Cr/Zn) add measurable thickness. Tolerance critical bores should be masked or reamed after finishing.

Call out standard (metric/UNC/UNF), class/fit, blind vs through, and depth. Provide a gauge plan (GO/NO-GO). For soft materials or plastics, consider threaded inserts and specify install method.

STEP (.step/.stp) for geometry + PDF drawing with GD&T and finish notes. Include native CAD only if necessary. For inspection, ballooned PDF helps align CTQs with reports.

Yes—FAI and CMM reports can be provided for CTQs. Agree the sampling plan (e.g., AQL) and which features are 100% checked. Provide datum scheme and measurement method if critical.

For large quantities Mill/lot certs are recorded at IQC and linked to the job traveler. Heat/lot IDs flow from incoming to shipping. Nonconforming material is quarantined in an MRB area with red-tag controls. For smaller quantities we issue a certificate.

• Increase radii to suit standard cutters.
• Unify hole sizes to reduce tool changes.
• Relax cosmetic tolerances; keep tight only on CTQs.
• Add chamfers/edge breaks instead of sharp edges.
• Design for vise/soft-jaw workholding (or add tabs).

Prototypes: ~5–10 working days for common alloys. Small/medium batches: ~2–4 weeks depending on finishing and inspection depth. Tight tolerances, special processes, or complex fixturing extend this.

Approved suppliers, specs on PO, and retained certs (thickness, hardness, composition). For critical applications, add adhesion or salt-spray tests and keep masked surfaces documented.

Use protection paper or bubble foil. Protect threads and critical faces, use VCI or desiccant for corrosion-prone alloys, and label cartons with part/rev/qty. Include inspection report, CoC, and finish certs in the document pouch. Heavy parts separated by cardboard.

Expired calibration stickers, no MRB quarantine, outdated work instructions at machines, missing ISO scope for machining, uncontrolled subcontract finishing, and inconsistent PM logs.

Yes—define the BOM, torque specs, adhesives, and test plan. For overmolding, provide insert CAD and overmold boundaries; agree gate/parting lines early.

Most parts are manufactured in-house. In case we need a sub-contractor: Sign mutual NDA, limit file access by project, and share only manufacturing data (no unnecessary IP). Consider splitting critical processes or keeping sensitive sub-assemblies in-house.

STEP + PDF drawing, quantities (proto/MP targets), material/temper, finishes, tolerance priorities (CTQs), inspection depth (FAI/CMM/AQL), and any special fixturing or 5-axis requirements.

Davantech operates 60+ CNC machines (3-/4-axis milling and turning). We schedule by capability and fixture availability; early notice for tight-tolerance runs ensures the right machine/time slot.