Fresado Y Torneado Ejercicios Groover

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Solutions for Fundamentals of Modern Manufacturing, 3/e (published by Wiley) © MPGroover 2007

22 MACHINING OPERATIONS AND MACHINE
TOOLS
Review Questions
22.1 What are the differences between rotational parts and prismatic parts in machining. Answer. Rotational parts are cylindrical or disk-shaped and are machined on a turning machine (e.g., a lathe); prismatic parts are block-shaped or flatand are generally produced on a milling machine, shaper, or planer. 22.2 Distinguish between generating and forming when machining workpart geometries. Answer. Generating refers to the creation of work geometry due to the feed trajectory of the cutting tool; examples include straight turning, taper turning, and profile milling. Forming involves the creation of work geometry due to the shape ofthe cutting tool; common examples include form turning and drilling. 22.3 Give two examples of machining operations in which generating and forming are combined to create workpart geometry. Answer. The two examples given in the text are thread cutting on a lathe and slot milling. 22.4 Describe the turning process. Answer. Turning is a machining process in which a single point tool removes materialfrom the surface of a rotating cylindrical workpiece, the tool being fed in a direction parallel to the axis of work rotation. 22.5 What is the difference between threading and tapping? Answer. A threading operation is performed on a turning machine and produces an external thread, while tapping is normally performed on a drilling machine and produces an internal thread. 22.6 How does a boringoperation differ from a turning operation? Answer. Boring produces an internal cylindrical shape from an existing hole, while turning produces an external cylindrical shape. 22.7 What is meant by the designation 12 x 36 inch lathe? Answer. A 12 x 36 lathe has a 12 inch swing (maximum work diameter that can be accommodated) and a 36 inch distance between centers (indicating the maximum work length thatcan be held between centers). 22.8 Name the various ways in which a workpart can be held in a lathe. Answer. Methods of holding the work in a lathe include: (1) between centers, (2) chuck, (3) collet, and (4) face plate. 22.9 What is the difference between a live center and a dead center, when these terms are used in the context of workholding in a lathe? Answer. A center holds the work duringrotation at the tailstock end of the lathe. A live center is mounted in bearings and rotates with the work, while a dead center does not rotate - the work rotates about it. 22.10 How does a turret lathe differ from an engine lathe?

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Solutions for Fundamentals of Modern Manufacturing, 3/e (published by Wiley) © MPGroover 2007

Answer. A turret lathe has a toolholding turretin place of a tailstock; the tools in the turret can be brought to work to perform multiple cutting operations on the work without the need to change tools as in operating a conventional engine lathe. 22.11 What is a blind hole? Answer. A blind hole does not exit the work; by comparison, a through hole exits the opposite side of the workpart. 22.12 What is the distinguishing feature of a radialdrill press? Answer. A radial drill has a long radial arm along which the drill head can be positioned to allow the drilling of large workparts. 22.13 What is the difference between peripheral milling and face milling? Answer. In peripheral milling, cutting is accomplished by the peripheral teeth of the milling cutter and the tool axis is parallel to the work surface; in face milling, cutting is...
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