CNC (computer numerically controlled) plasma cutters fully automate the shape production process. Early cnc machines used a tape with small holes punched through to provide instructions to a primitive (by today's standards) computer.
Today's CNC units use either expensive limited production computers made specifically for running burning machines, or personal computers adapted to run the machines. While the latter group lack some of the refined features of the $100,000 and up machines, such as automatic shape nesting and automatic tip height control, they provide the same cut quality and production speed.
In CNC cutting, you arrange your shapes on the computer screen and cut them automatically, without having to touch the material.
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CNC software lets you program pauses for piercing, scale up or down in seconds, set acceleration and deceleration at corners, and other functions not possible with electric eye units.
The above shapes were created in CorelDraw, and then turned and nested together to minimize scrap material. The group of shapes were then exported as a single DXF file. The file was then imported into our Torchmate driver software, which automatically converts it to G-code for cutting.
The shapes are cut in a sequence that minimizes the distance the torch must travel. While cutting speed here is 80 inches per minute (IPM), rapid traverse between cuts is 300 IPM.
http://www.plasma-cutter.com/cnc.htm
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