What is CNC milling？

25, Jun. 2023

What is CNC milling?

CNC milling uses rotational cutting tools to remove material from a workpiece to produce finished parts and products. This manufacturing process works well for many materials, including metals, polymers, wood and glass. CNC milling systems generally have 3 linear degrees of freedom: the

X, Y and Z axis. This allows for top-notch precision and detailing. Hubs also offers more advanced, 5-degree systems, where the tool head and machining bed (A andBaxis)canalsorotate.5axisCNCmachinescanproduce parts with high geometric complexity without needing multiple machinesetups.

Plastics A wide range of plastics for CNC machining, withapplications in multiple industries. ldeal for both one-offprototypes and end-use custom parts.

CNC Milling Tolerances & Standards

Description	General Tolerance or Standard
Maximum Part Size	Milled parts up to 80” x 48” x 24” (2,032 x 1,219 x 610 mm).
Distance Dimensions	For features of size (Length, width, height, diameter) and location (position, concentricity, symmetry) +/- 0.005”.
Orientation and Form Dimensions	0-12" +/- 0.005", Angularity 1/2 degree. For 24" and beyond please consult Xometry's Manufacturing Standards.
Precision Tolerances	Xometry can manufacture and inspect to tight tolerances per your drawing specifications including GD&T callouts.
Minimum Feature Size	0.020” (0.50 mm). This may vary depending on part geometry and chosen material.
Threads and Tapped Holes	Xometry can accommodate any standard thread size. We can also machine custom threads; these will require a manual quote review.
Surface Finish	The standard finish is as-machined: 125 Ra or better. Additional finishing options can be specified when getting a quote.
Edge Condition	Sharp edges will be broken and deburred by default. Critical edges that must be left sharp should be noted and specified on a print.

CNC precision parts machining, common material types

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Keywords: Surface Finishing Options, Materials, CNC Machining