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9 - Chapter 7 - TC 9-524 Chapter 7 LATHES The lathe is a...

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TC 9-524 Chapter 7 LATHES The lathe is a machine tool used principally for shaping articles of metal (and sometimes wood or other materials) by causing the workpiece to be held and rotated by the lathe while a tool bit is advanced into the work causing the cutting action. The basic lathe that was designed to cut cylindrical metal stock has been developed further to produce screw threads. tapered work. drilled holes. knurled surfaces, and crankshafts. The typical lathe provides a variety of rotating speeds and a means to manually and automatically move the cutting tool into the workpiece. Machinists and maintenance shop personnel must be thoroughly familiar with the lathe and its operations to accomplish the repair and fabrication of needed parts. TYPES OF LATHES lathe (Figure 7-1 ) is ideally suited for this purpose. A trained Lathes can be divided into three types for easy identification: operator can accomplish more machining jobs with the engine lathes, turret lathes, and special purpose lathes. Small engine lathe than with any other machine tool. Turret lathes lathes can be bench mounted, are lightweight, and can be and special purpose lathes are usually used in production or transported in wheeled vehicles easily. The larger lathes are job shops for mass production or specialized parts. while floor mounted and may require special transportation if they basic engine lathes are usually used for any type of lathe must be moved. Field and maintenance shops generally use a work. Further reference to lathes in this chapter will be about lathe that can be adapted to many operations and that is not too the various engine lathes. large to be moved from one work site to another. The engine 7-1
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TC 9-524 ENGINE LATHES Lightweight Sizes The size of an engine lathe is determined by the largest piece of stock that can be machined. Before machining a workpiece, the following measurements must be considered: the diameter of the work that will swing over the bed and the length between lathe centers (Figure 7-1 ). Categories Lightweight bench engine lathes are generally small lathes with a swing of 10 inches or less, mounted to a bench or table top. These lathes can accomplish most machining jobs, but may be limited due to the size of the material that can be turned. Precision Precision tool room lathes are also known as standard manufacturing lathes and are used for all lathe operations, Slight differences in the various engine lathes make it easy such as turning, boring, drilling, reaming, producing screw to group them into three categories: lightweight bench engine threads, taper turning, knurling, and radius forming, and can lathes, precision tool room lathes, and gap lathes, which are be adapted for special milling operations with the appropriate fixture. This type of lathe can handle workplaces up to 25 also known as extension- type lathes. These lathe categories are shown in Figure 7-2 Different manufacturers may use inches in diameter and up to 200 inches long. However, the different lathe categories.
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