Mehta N. Machine Tool Design and Numerical Control 3ed 2013

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Mehta N. Machine Tool Design and Numerical Control 3ed 2013

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Textbook in PDF format The first edition of the book was published in 1984 under the title, Machine Tool Design, when the subject was gaining popularity as a specialised course in engineering institutions in the country. The motivation for writing the book was to provide a basic text for undergraduate students that would also serve as a useful reference for postgraduate students and practicing engineers. The revision of the book for the second edition published in 1996 was undertaken with the limited objective of incorporating the advances in numerical control in the intervening years. Therefore, the chapter on ‘Numerical Control of Machine Tools’ was substantially modified and a new chapter on Extensions of Numerical Control – CNC, DNC, Machining Centers’ was added. To adequately, reflect the updated content, the title of the book was changed to Machine Tool Design and Numerical Control. In today’s ‘user-friendly age’, the revision for the third edition has been undertaken primarily to make the book more reader friendly and the changes are mostly based on the feedback from the reviewers and a survey carried out by the publisher. The important new features of this edition are summarised below: A subsection on ‛Calculation of Machining Time’ has been added in Chapter 1. The highlight of this section is the inclusion of calculation of machining time of grinding operations which is usually not covered in text books. A major section on ‛Kinematics of Machines Tools’ has been added in Chapter 2, wherein the gearing diagrams of lathe, drilling machine and milling machine have been discussed to give the reader a better understanding of the finer practical aspects of gear box design. A new attractive feature of this section is the discussion on thread cutting operation on lathe and operations using indexing head on milling machine based on fundamental principles, as distinct from the usual thumb rule type approach in most of the existing books. It is felt that this section will serve as useful base material for formulating design projects and independent assignments for final year students of mechanical and production engineering disciplines In the second edition the design procedure of machine tool gear boxes was terminating with the calculation of gear teeth. This has been extended in the present edition, to its logical conclusion by adding a subsection on ‛Determination of Shaft and Gear Dimensions’ in Chapter 2. A subsection on ‛Design of Lathe Bed’ has been added in Chapter 3 giving the detailed procedure supported with a solved example to provide practical illustration of the theoretical aspects for one specific case. This material will be helpful in formulating design projects and assignments not only for beds of various machine tools but also for other structural elements of machine tools such as bases, columns, tables etc. A large number of solved examples have been added, especially in Chapters 1–3 in support of the elaboration of the new topics added in these chapters. In addition, new review questions have also been added in almost all the chapters. A major curtailment has been undertaken in Chapter 8 on ‛Numerical Control of Machine Tools’. Previous edition contained a detailed description of the hardware of NC technology spread over seven subsections. Most of this technology has now become obsolete. It has, therefore, been thoroughly condensed and retained in one subsection only to the extent necessary for understanding the functioning/operation of NC machine tools. Enhanced pedagogy includes