Titlebook: CNC Setting and Operation Workbook; Tom Renshaw,Peter Riley (Head of Department of Eng Textbook 1994Latest edition Tom Renshaw and City an

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Work-holding,es. It is also possible for rotation to take place about each of the three axes, X, Y and Z. Movement can take place in any of these six ways and this is often described as having six . (Figure 4.1). When you clamp a component, you need to think about constraint in all six (Figure 4.2).

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Tool changing,y efficient materials handling and tool changing. The aim is to reduce downtime and to optimise the manufacturing process, at whatever scale of production. It is inefficient to stop a CNC machine to adjust tool clamps or holders. So any setting to centre height or tool datums must, where possible, b

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Tool setting,rt program. The distance from the tool tip to the work datum is a much more usable value. To determine this distance you have to take into account the Z axis setting value and the X axis setting value. These values position the tool tip in relation to the turret datum in the X and Z axes (Figure 9.1

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NC program listing and analysis,rocess, you must understand the programming format. The format used in this book is called the .. The programming data is conveyed by blocks of words, in which each word has an identifying letter address. This preceding letter defines the function of the word. A block of information that defines an

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Input, edit and store data,ion time and machine downtime. The MDI facility is therefore normally used to edit the program as required, after it has been transferred to the machine. Its main function is its use for viewing, editing and setting the MCU parameters.

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Program proving,erator. The program and all relevant information must be checked, either by viewing the program displayed on the MCU screen, or by using a software package on a computer and then proving the program on the machine. Errors that may be detected include the following:.Graphic simulation (see below) com

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Tape handling, the MCU, either via a direct computer link or by a punched tape. Similarly, when the machining is completed the part program is often stored for future use, either on computer discs or on punched tape.

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H. X. He,S. Boussaad,B. Q. Xu,N. J. TaoComputer numerical control (CNC) systems and machine tools are essential elements in many industrial processes. The setting and operation assignments in this workbook will provide a broad range of practical experiences which represent a valuable foundation to the successful application of this technology.