By Peter Smid
Over its first variants, this best-selling ebook has turn into the de facto average for education and reference fabric in any respect degrees of CNC programming. utilized in 1000's of academic associations worldwide because the fundamental textual content for CNC classes, and used day-by-day through many in-field CNC programmers and computer operators, this e-book actually defines CNC programming.
Written with cautious realization to aspect, there are not any compromises. some of the adjustments during this new 3rd variation are the direct results of reviews and proposals got from many CNC pros within the box. This terribly accomplished paintings is still filled with over 1000 illustrations, tables, formulation, suggestions, shortcuts, and functional examples.
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Extra resources for CNC Programming Handbook (3rd Edition)
CNC programmer can override feedhold from within the program, for special purposes. u Emergency Stop Every CNC machine has at least one special mushroom shaped push button, red in color, that is located in an accessible place on the machine. It is marked as the Emergency Stop or E-stop. When this button is pressed, all machine activities will cease immediately. The main power supply will be interrupted and the machine will have to be restarted. Emergency stop switch is a mandatory safety feature on all CNC machines.
When this option is in effect and the CNC unit detects a motion in the program that takes place within the forbidden zone, an error condition results and the machining is interrupted. A typical applications may include zones occupied by a tailstock, a fixture, a chuck, a rotary table, and even an unusually shaped part. u Drawing Dimensions Input An option that seems somewhat neglected, is the programming method by using input of dimensions from an engineering drawing. The ability to input known coordinates, radiuses, chamfers and given angles directly from the drawing makes it an attractive option.
Sn = Optimized - or NEW - r/min Sp = Originally programmed r/min p = Percentage of spindle override Overriding the programmed spindle speed on CNC machines should have only one purpose - to establish spindle speed rotation for the best cutting conditions. 27 u Feedrate Override Probably the most commonly used override switch is one that changes programmed feedrates. For milling controls, the feedrate is programmed in in/min or m/min. For lathe controls, the feedrate is programmed in in/rev or in mm/rev.
CNC Programming Handbook (3rd Edition) by Peter Smid