Manufacturing Processes_ (23) - 414 Introduction to Basic...

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414 Introduction to Basic Manufacturing Processes and Workshop Technology ( vi ) Width of bed ( vii ) Morse taper of center ( viii ) Diameter of hole through spindle ( ix ) Face plate diameter ( x ) Size of tool post ( xi ) Number of spindle speeds ( xii ) Lead screw diameter and number of threads per cm. ( xiii ) Size of electrical motor ( xiv ) Pitch range of metric and inch threads etc. 21.6 LATHE OPERATIONS For performing the various machining operations in a lathe, the job is being supported and driven by anyone of the following methods. 1. Job is held and driven by chuck with the other end supported on the tail stock centre. 2. Job is held between centers and driven by carriers and catch plates. 3. Job is held on a mandrel, which is supported between centers and driven by carriers and catch plates. 4. Job is held and driven by a chuck or a faceplate or an angle plate. The above methods for holding the job can be classified under two headings namely job held between centers and job held by a chuck or any other fixture. The various important lathe operations are depicted through Fig. 21.8 ( a ), ( b ) and ( c ). The operations performed in a lathe can be understood by three major categories Porting tool Turning tool Right hand turning tool Left hand turning Radius tool Threading tool

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