Manufacturing Processes – II（制造过程u2014u2014二世）.pdfVIP

Module 4 General Purpose Machine Tools Version 2 ME, IIT Kharagpur Lesson 23 Construction, Operation and Tool layout in Semiautomatic and Automatic lathes. Version 2 ME, IIT Kharagpur Instructional objectives This lesson will enable the students ; (i) Illustrate the constructional features and uses of semiautomatic and automatic lathes. (ii) Show the kinematic system and explain the working principles of semiautomatic and automatic lathes of common use. (iii) Plan and visualise tool layout for machining in semiautomatic and automatic lathes. (i) Constructional Features And Uses Of General Purpose Semiautomatic And Automatic Lathes. Automation is incorporated in a machine tool or machining system as a whole for higher productivity with consistent quality aiming meeting the large requirements and overall economy. Such automation enables quick and accurate auxiliary motions, i.e., handling operations like tool – work mounting, bar feeding, tool indexing etc. repeatably with minimum human intervention but with the help of special or additional mechanism and control systems. These systems may be of mechanical, electro-mechanical, hydraulic or electronic type or their combination. It is already mentioned that according to degree of automation machine tools are classified as, • Non automatic where most of the handling operations irrespective