- The abbreviation CNC stands for Computer Numerical Control, and refers specifically to a computer "controller" that reads G-code instructions and drives the machine tool, a powered mechanical device typically used to fabricate metal components by the selective removal of metal.
- CNC was preceded by NC (Numerically Controlled) machines, which were hard wired to produce one specific part. The first CNC systems used NC style hardware, and the computer was used for the tool compensation calculations and sometimes for editing.
- A CNC machine uses mathematics and coordinate systems to understand and process information about what to move, to where, and how fast.
- The introduction of CNC machines radically changed the manufacturing industry. Curves are as easy to cut as straight lines, complex 3-D structures are relatively easy to produce, and the number of machining steps that required human action have been dramatically reduced.
- The CNC machining center market has changed in recent years; the various design software programs play a more important role in the entire technology solution that is being provided to the customer.
- Good practices for powering and grounding this equipment, coupled with proven installation and maintenance procedures, is necessary to prevent malfunction, degradation, and damage to the sensitive electronics within this equipment.
- The susceptibility of a CNC machine to different sources of noise and stray current will depend on how it was originally connected to the power distribution system as well as how the manufacturer originally designed the machine.