By Graham T. Smith
This is the second one quantity of 3 designed to provide an perception into the present nation of CNC know-how with a spotlight on useful functions. Following a short historic creation to slicing software improvement, chapters 1 and a pair of clarify why CNC calls for a transformation in slicing device know-how from traditional equipment. 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 skill of CNC machines. when you consider that an enormous attention for any computer device 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 worried with workholding know-how. the writer attracts on his broad event as a practitioner and instructor. The textual content is punctiliously functional in personality and generously illustrated with diagrams and photographs.
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Extra resources for CNC Machining Technology: Volume II Cutting, Fluids and Workholding Technologies
To obtain good chip control characteristics the geometry across the rake face is exceedingly complex. When considering chip control designs, two main types occur: chipbreakers chipformers The most recent types - chipformers - are distinguished still further by subdivisions into those that cut and form a chip and those that mostly form once it is cut. However, a requirement of any chip-control cutting tool is to produce chips that do not inhibit normal production or impair part finishes. If we consider the original chipbreaker designs, these only tend to break it, or others simply narrow the chip.
The answer to this can be found by considering the consequences of not providing such monitoring equipment: in a recent German survey it was determined that a typical collision resulted in around £7500 worth of damage to the machine tool. This is exacerbated by the staggering statistics that for all tool collisions, 72% were the direct result of operator error, whilst only 26% were traced to faults in the electrical systems, with 2% of all faults unclassified. These results clearly show the advantages of incorporating tool/machine protection devices for a relatively small capital cost.
S. Cutter insert geometry and terminology in milling operations. a Cutter insert geometry. b Negative/negative. c Positive/positive. d Negative/positive. NB: The angle of inclination of the insert generally termed "plan approach angle" and denoted by the Greek letter A, has a significant effect on the cutter's performance and the workpiece. ] 22 CNC Machining Technology provides a strong cutting edge, whilst the positive rake creates the shearing action. The axial rake determines the direction of chip flow and as this type of cutter has a positive axial plane, the chips are directed up and away - termed evacuated, or exhausted - from the workpiece.