- published: 30 Jun 2014
- views: 1172971
Numerical control (NC) is the automation of machine tools that are operated by precisely programmed commands encoded on a storage medium, as opposed to controlled manually by hand wheels or levers, or mechanically automated by cams alone. Most NC today is computer (or computerized) numerical control (CNC), in which computers play an integral part of the control.
In modern CNC systems, end-to-end component design is highly automated using computer-aided design (CAD) and computer-aided manufacturing (CAM) programs. The programs produce a computer file that is interpreted to extract the commands needed to operate a particular machine by a post processor, and then loaded into the CNC machines for production. Since any particular component might require the use of a number of different tools – drills, saws, etc., modern machines often combine multiple tools into a single "cell". In other installations, a number of different machines are used with an external controller and human or robotic operators that move the component from machine to machine. In either case, the series of steps needed to produce any part is highly automated and produces a part that closely matches the original CAD design.
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Silent night, holy night,
All is calm, all is bright
Round yon virgin mother and child.
Holy infant so tender and mild,
Sleep in heavenly peace.
Sleep in heavenly peace.
Silent night, holy night,
Shepherds quake at the sight,
Glories stream from heaven afar,
Heavenly hosts sing alleluia;
Christ the Savior, is born!
Christ the Savior, is born!
Silent night, holy night,
Son of God, love's pure light
Radiant beams from thy holy face,
With the dawn of redeeming grace,
Jesus, Lord, at thy birth.