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UNIT 14 DESIGN OF MACHINE STRUCTURES Structures …

33 DESIGN of MACHINE StructuresUNIT 14 DESIGN OF MACHINE STRUCTURES Structure Introduction Objectives Functions of MACHINE Tool Structure DESIGN Criteria for MACHINE Tool Structure DESIGN of Beds DESIGN of Columns DESIGN of Housing Summary Key Words INTRODUCTION MACHINE tool consists of MACHINE tool structure, bed, column, housings. These are the base of MACHINE tool on which the guideways, spindle, carriage, etc. are mounted. These elements must able to withstand at higher permissible load.

These are used in lathes, turrets etc. 4 Beds on legs : without stiffening wall with 30-40% higher stiffness than (3). These are used in multiple tool and high production lathes. 5 With stiffening wall and provision of chip disposal through opening in rear wall These are employed in large sized lathes and turrets.

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