CNC machining
also: CNC milling · CNC turning · machined parts
Cutting parts from solid metal or plastic with computer-controlled tools; ideal for prototypes and low volumes, but costly per part at high volume.
A CNC mill or lathe removes material from a block or bar following programmed tool paths. It produces precise, strong parts in almost any metal or engineering plastic with no tooling cost, which makes it the default for prototypes, fixtures, low-volume parts and features that need tight tolerances.
Cost scales with machine time and setups. Complex geometry, deep pockets, small internal radii, thin walls, tight tolerances and features that need several orientations all add cost. Five-axis machines reduce setups for complex parts but cost more per hour.
Where it bites: parts designed for machining are often expensive at volume, and moving to casting or molding later means redesign. Applying tight tolerances to every feature by default multiplies cost and inspection time.
Founder takeaway
Use machining for speed and low volume, apply tight tolerances only where function requires them, and plan the production process if volumes will grow.
engineer review pending