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MessagePosté le: Sam 3 Sep - 15:04 (2016)    Sujet du message: Drilling Operation On Lathe Machine Pdf Download Répondre en citant




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When the cutting tool engages the workpiece, a chip is formed. Each process is chosen based on the requirements and parameter values of a particular application. In some cases a movement of a fraction of a micrometre in one area is amplified in lever fashion to create a positional error of several micrometres for a feature of the workpiece several decimetres away. In some cases tolerances as tight as 0.0001in (0.0038mm) can be held in shallow holes, but it is expensive, with 100% inspection and loss of nonconforming parts adding to the cost. For nontapered holes, the cutting tool moves parallel to the axis of rotation. Gun drilling and cannon boring are classic examples. Workpieces are commonly 1 to 4 metres (3ft 3in to 13ft 1in) in diameter, but can be as large as 20m (66ft). Boring is one of the most basic lathe operations next to turning and drilling.

Collets combine self-centering chucking with low runout, but they involve higher costs. In most cases they involve multiple cutting points, diametrically opposed, whose deflection forces cancel each other out. Boring head on Morse taper shank. They also usually involve delivery of cutting fluid pumped under pressure through the tool to orifices near the cutting edges. Lathes[edit]. The four most commonly used workholding devices are the three-jaw chuck, the four-jaw chuck, the collet, and the faceplate. The cutting tool is usually single point, made of M2 and M3 high-speed steel or P10 and P01 carbide. Because boring is meant to decrease the product tolerances on pre-existing holes, several design considerations apply. Geometries ranging from simple to extremely complex in a variety of diameters can be produced using boring applications.

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