tailieunhanh - machine tool lathe

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. | 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 can be divided into three types for easy identification engine lathes turret lathes and special purpose lathes. Small lathes can be bench mounted are lightweight and can be transported in wheeled vehicles easily. The larger lathes are floor mounted and may require special transportation if they must be moved. Field and maintenance shops generally use a lathe that can be adapted to many operations and that is not too large to be moved from one work site to another. The engine LATHES lathe Figure 7-1 is ideally suited for this purpose. A trained operator can accomplish more machiningjobs with the engine lathe than with any other machine tool. Turret lathes and special purpose lathes are usually used in production or job shops for mass production or specialized parts. while basic engine lathes are usually used for any type of lathe work. Further reference to lathes in this chapter will be about the various engine lathes. 7-1 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