By Peter Smid
Over its first variants, this best-selling publication has turn into the de facto regular for education and reference fabric in any respect degrees of CNC programming. utilized in thousands of academic associations worldwide because the fundamental textual content for CNC classes, and used day-by-day by means of many in-field CNC programmers and laptop operators, this publication actually defines CNC programming.
Written with cautious realization to aspect, there aren't any compromises. the various alterations during this new 3rd version are the direct results of reviews and proposals got from many CNC execs within the box. This terribly complete paintings is still choked with over a thousand illustrations, tables, formulation, counsel, shortcuts, and sensible examples.
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Additional info for CNC Programming Handbook (3rd Edition)
Example text
Some types of motion restrict the feedhold function or disable it altogether. For example, threading or tapping modes make the switch inoperative. Activating feedhold at the machine will not change any other program values - it will only affect axis motion. Feedhold switch will be illuminated (in red light), as long as it is effective. 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.
U Sequence Return Sequence Return is a special function controlled by a switch or a key on the control panel. Its purpose is to enable the CNC operator to start a program from the middle of an interrupted program. Certain programmed functions are memorized (usually the last speed and feed), others have to be input by the Manual Data Input key. Operation of this function is closely tied to actual machine tool design. More information on the usage can be found in the machine tool manual. This function is very handy when a tool breaks during processing of very long programs.
This capacity is measured in variety of ways, originally as the equivalent length of tape in meters or feet, lately as the number of bytes or the number of screen pages. A common minimum memory capacity of a small CNC lathe control may be 20m of tape (66 ft). This is an old fashioned method that somehow persisted in staying with us. On CNC milling systems, the memory requirements based on the same criteria are generally larger and the typical minimum memory capacity is 80 m or about 263 ft. Optionally, larger memory capacity can be added to any control system.