The first and most important concept a person needs to know to program CNC machines is that of rectangular and/or Cartesian coordinates. This video covers the very basic concepts of point, line and plane geometry and rectangular coordinates. If you already know this stuff, you may want to just skip this video.
Ebook: 7 Easy Steps to CNC Programming . . . A Beginnter’s Guide
http://www.haydenpub.com
The CNC Project 
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