CNC
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CNC stands for Computerized Numerical Control. A CNC is graded by their precision capabilities, CNC machines allow for high-end engraving of metals in 2D and in 3D to produce amazing results. The problem with CNC machines is that they are expensive, and the desktop version always disappoints because precision requires no unintended movements such as from inertia, from the weight of the spindle. Higher precision machines probably have a fixed spindle and a moving bed, while bigger machines have a fixed bed.
Factors affecting precision are...
- Rigidity of the frame
- Force of the stepper motors