By Graham T. Smith
This is the second one quantity of 3 designed to offer an perception into the present nation of CNC know-how with a spotlight on useful purposes. Following a quick ancient advent to slicing device improvement, chapters 1 and a couple of clarify why CNC calls for a transformation in slicing instrument know-how from traditional tools. A presentation is given of the operating wisdom of slicing instruments and cutt ing fluids that is had to make optimum use of the efficient means of CNC machines. on account that a huge attention for any computing device software is how you can find and restrain the workpiece within the right orientation and with the minimal of set-u p time, bankruptcy three is anxious with workholding know-how. the writer attracts on his broad event as a practitioner and instructor. The textual content is carefully sensible in personality and generously illustrated with diagrams and photographs.
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Extra info for CNC Machining Technology: Volume II Cutting, Fluids and Workholding Technologies
Fig. 24. A range of modular quick-change "block'" tooling illustrating "intelligent/tagged" pro-. grammable clubheads clearly discernible by the five contact pins amongst standard units. ] explanation. If a company, or indivi"dual, requires further information, then the manufacturers of such systems should be consulted, or alternatively, a more in-depth review appears in the companion volume to this book. B Tool and Workpiece Monitoring Systems Regardless of whether a machine is in a Flexible Manufacturing System, or indeed in a stand-alone situation, when it is unmanned, or at best minimally manned, a variety of problems must be overcome if such machine tools are to function correctly.
In order to mill a thread on a machining centre, it must be equipped with a helical interpolation facility (see chapter 1). Prior to it being machined the "correct" diameter must be circular interpolated on the hole, or boss, as necessary. Figure. 14 shows an efficient thread milling cutter. Thread milling requires the cutter to obtain the smoothest entry into the workpiece and in so doing it avoids thread errors, so it is usual to "arc" in and out of the cut. The position at which the "arc" begins to feed is chosen by considering the cycle time, which, for a large diameter internal thread, can be long.
The multi-tooth designs have the second tooth cutting deeper than the leading one and the third, when present, deeper than the second, with only the last tooth being of full form. With both the previous full-form and V-profile designs a range of programming feeds can be employed, but using the multi-toothed inserts the radial (plunge) method should be used; however, more will be said later, in the chapters on programming cutters and workpiece profiles. The technology of thread turning operations for internal, external, single and multistart and tapered threads is beyond the scope of this review, together with chip formation effects and inclination of inserts and their respective geometries.
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