By Peter Smid
Over its first variants, this best-selling booklet has turn into the de facto commonplace for education and reference fabric in any respect degrees of CNC programming. utilized in 1000s of academic associations all over the world because the basic textual content for CNC classes, and used day-by-day through many in-field CNC programmers and computer operators, this ebook actually defines CNC programming.
Written with cautious recognition to element, there are not any compromises. a few of the alterations during this new 3rd version are the direct results of reviews and recommendations obtained from many CNC pros within the box. This terribly finished paintings remains to be filled with over 1000 illustrations, tables, formulation, tips, shortcuts, and useful examples.
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Extra info for CNC Programming Handbook (3rd Edition)
Many features of the control unit are designed to make operator’s job easier. They allow a focus on one or two items at a time rather than the complexity of the whole program. These features have been covered in a reasonable detail, now is the time to look at some practical applications. During initialization of a new program run, a good CNC operator will take certain precautions as a matter of fact. For example, the first part of the job will most likely be tested with a rapid motion set to 25% or 50% of the available rapid rate.
COORDINATE GEOMETRY 17 Numbering of quadrants always starts at the positive side of the horizontal axis. Figure 4-5 illustrates the definitions. 0 Figure 4-5 Quadrants in the XY plane and their identification Any point coordinate value can be positive, negative or zero. All point coordinates are determined solely by their location in a particular quadrant and individual distances along an axis, again, relative to origin - Figure 4-6. Point location Quadrant Quadrant Quadrant Quadrant I II III IV Coordinate X-axis Y-axis + + + + - Figure 4-6 Algebraic signs for a point location in plane quadrants n IMPORTANT: … If the defined point lies exactly on the X-axis, it has the Y value equal to zero (Y0) … If the point lies exactly on the Y-axis, it has the X value equal to zero (X0) … If the point lies exactly on both X and Y axes, both X and Y values are zero (X0 Y0).
The default setting is also the most logical - usually 10% of the maximum rapid traverse rate. This setting should never be higher than 25% and can be done only through setting of a system parameter. Make sure that all persons who work on such a machine are aware of the changes. CONTROL SYSTEM u Spindle Speed Override The same logic used for the application of rapid rate override can be used for the spindle speed override. The required change can be established during actual cutting by using the spindle speed override switch, located on the machine control panel.