Question 1

What is the typical lead time for CNC milled parts?

Accepted Answer

Standard lead times for CNC milling are typically 10–15 business days, depending on material availability, part complexity, and required surface finishes. Expedited builds are possible for simpler geometries with minimal secondary operations.

Question 2

What tolerances can be achieved with CNC milling?

Accepted Answer

Standard CNC milling tolerances are typically ±0.005" (ISO 2768-m). For critical features, tighter tolerances down to ±0.001" can be achieved with stable setups, controlled tooling strategies, and appropriate inspection methods. Use our ***interactive ISO 2768 chart***(/resources/charts/iso-2768-tolerance-chart), ***tap drill calculator***(/resources/tools/drill-tap-chart), and ***drill bit size chart***(/resources/charts/drill-bit-size-chart) when specifying holes and threads.

Question 3

Which materials machine best for CNC milling?

Accepted Answer

Aluminum 6061-T6 is the most cost-effective and predictable material for CNC milling. For plastics, Acetal (Delrin) offers excellent dimensional stability and surface finish. Harder alloys and filled plastics may increase cycle time and tooling wear.

Question 4

Do you support 5-axis CNC milling?

Accepted Answer

Yes. 5-axis CNC milling is used for parts requiring multi-face access, complex feature alignment, or reduced setup count. This improves positional accuracy and minimizes tolerance stack-up on complex prismatic geometries.

Question 5

Can parts be machined from a 3D CAD model without a 2D drawing?

Accepted Answer

We can CNC mill parts directly from 3D CAD files such as STEP or Parasolid. However, a 2D drawing is strongly recommended when specific tolerances, GD&T callouts, surface finishes, or thread requirements are critical.

Question 6

What is the maximum part size for CNC milling?

Accepted Answer

Our standard CNC milling work envelope supports parts up to 40" × 20" × 20". Larger or non-standard geometries may be reviewed on a case-by-case basis depending on fixturing and setup requirements.

Question 7

Do you provide inspection reports and material traceability?

Accepted Answer

Yes. Material certifications (MTRs), Certificates of Conformance (CoC), and dimensional inspection reports are available upon request. Inspection scope can be aligned to project requirements, including first-article validation.

Question 8

What surface finishes are available for CNC milled parts?

Accepted Answer

Common finishes include As-Milled (Ra ~125), Bead Blasting, Type II and Type III Anodizing, Conversion Coatings, Electroless Nickel Plating, and Powder Coating. Finish availability depends on material and part geometry.

Question 9

How can I reduce the cost of CNC milled parts?

Accepted Answer

Cost can be reduced by increasing internal corner radii, avoiding deep or narrow pockets, limiting tight tolerances to functional features only, and designing parts to minimize setup count and tool changes.

Question 10

Do you support repeat production of CNC milled parts?

Accepted Answer

Yes. CNC milling is well suited for repeat production of prismatic components. Stable fixturing, documented setups, and inspection plans ensure consistency across recurring orders.

Custom CNCMilling Services

Custom CNCMilling Services