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This directory of terms is provided by Mr. Norman Bleier. While primarily for users of Siemens controllers, most of the information is useful to anyone in the CNC world.
Free CNC G Code Plotter
Mr. Scott Martinez has created a free, easy to use G code simulator that works for turning and machining centers. For a modest fee, a more powerful version is available. This program is highly recommended for users wishing to try programs out without an actual machine.
Training Materials for CNC
Mr. Mike Lynch operates CNC Concepts Inc. which provides many types of training materials for CNC. Mike is a recognized leader in the areas of CNC training and macro programming.