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The drilling operation in this example is programmed as follows: GOTO/P6 GODTLA/0.0, 0.0, 2.5 GODTLA/0.0, 0.0, 2.5 A path control is programmed with the following commands: GOFWD GOLFT GODWN GOBACK GORGT GOUP (go forward) (go left) (go down) (go back) (go right) (go up)
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With these commands, it is possible, for example, to program the movement of a cutting tool in accordance with the contour in the example. GOTO/S1,TO,SURFACE1,TO,S2 GOFWD/S1,PAST,S5 GOFWD/S5,TANTO,K1 GOFWD/K1,TANTO,K2 GOFWD/K2,PAST,S6 GOFWD/S2,PAST,S1 Go to start point P1 Go along line S1 to S5 Go along line S5 to K1 Go from K1 via S4 to K2 Go from K2 via S4 to S6 Go along line S2 to S1
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9.6.5.3 Auxiliary Commands
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Various switching functions are programmed using commands from this group for example: MACHIN FEDRAT COOLNT CUTTER PARTNO FINI Specifies the tool Determines the feed speed Connects coolant Diameter of the tool Part number of the workpiece Program end
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Other application-oriented programming languages for NC programming are EXAPT, ADAPT, and AUTOSPOT. These languages are constructed like APT, and in part build on that language. An NC program written in application-oriented language must, of course, also be translated into machine code and produced in punched tape (Fig. 9.25).
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The program for a specific machining task of an NC machine is located on a punched tape. This punched tape must be read separately for
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FIGURE 9.25 NC program translated into machine code and produced in punched tape.
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every single workpiece to be machined. Reading of punched tape is a mechanical process that subjects the tape to wear, which can lead to errors. With the development of computer numerical control, it became possible to overcome these disadvantages and, in addition, to create many advantages. A CNC system contains its own computer system based on modern microcomputer technology. A semiconductor memory is used as program memory. The punched tape is in fact also
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available with the system. However, it is only required when the program is transferred into the semiconductor memory. In addition to this program entry technique, CNC systems offer the possibility of transferring programs directly from external computers via appropriate interfaces. Moreover, most CNC control systems are equipped with a keyboard and a screen that make it possible to program directly on the machine. This is referred to as workshop programming. Keyboard and screen also offer the possibility of editing and improving programs on site. This is a decisive advantage when compared to NC systems, where modifications and adaptations are much more time-consuming. With microcomputers, it is easy to program the frequently complicated arithmetical operations required for machining complicated curves. Cutting and feed speed can be matched to the best advantage. The computer can check and adapt the values continually and thus determine the most favorable setting values. Integrated test and diagnostic systems, which are also made possible by microcomputers, guarantee a high degree of availability for CNC systems. The control system monitors itself and reports specific errors independently to the operator. The programming languages correspond in part to those discussed for NC systems but are, in fact, frequently manufacturer-specific. The most important components of a CNC system are illustrated in Fig. 9.26.
FIGURE 9.26 CNC system components.
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The modern term for handling technology is industrial handling or simply handling. This concept embraces simple and complex handling and clamping devices. The best and most versatile handling component is the human hand. Within its physical limitations of weight and size, many possibilities are available: gripping, allocating, arranging, feeding, positioning, clamping, working, drawing, transferring, and so on. Unlike the human hand, a mechanical handling device is able to perform only a very limited number of functions. For this reason, several handling devices have been developed for automatic handling and clamping functions. It is not necessary to make a full copy of the human hand. A mechanical device is more or less limited to the shape, size, construction material, and characteristics of a specific workpiece to be handled. Fig. 9.27 shows a device made up of four pneumatic handling units that can insert parts into a lathe for turning. Cylinder A separates the parts to be turned and assumes the function of allocating parts in the machine-ready position. The part to be turned is brought to the axial center of the machine. At this position, the part can be taken over by the gripping cylinder D. Cylinders B and C are used to insert the workpiece into the clamping chuck and remove it again after machining.
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