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MACHINING OPERATIONS AND MACHINE TOOLS

1 MACHINING OPERATIONS AND MACHINE TOOLS1. Turning and Related Operations2. Drilling and Related Operations3. Milling4. MACHINING & Turning Centers5. Other MACHINING Operations6. Shape, Tolerance and Surface Finish7. Machinability8. Selection of Cutting Conditions9. Product Design Consideration2dfDoDfL1. Turning & Related OPERATIONS Turning a MACHINING process in which a single-point tool remove material from the surface of a rotating work piece. (Lathe)vvfdMRRfLTNffdDDDvNrmrfoo==== =2 Rotational Speed:Feed rate:Time of MACHINING :Material Removal Rate:3 OPERATIONS related to TurningFacingTaper turningContour turningForm turningChamferingCutoffThreadingBoringDr illingKnurling4 Work Holding Mounting between two centers (Dog & Live center) Chuck Collet Face plate5 Engine LatheBedCarriageHeadstockTailstockTool postThreaded Lead Screw6 Other Lathes & Turning MACHINE Toolroom Lathe and Speed Lathe Turret Lathe The tailstock is replaced with a turret Chucking Machines No tailstock Automatic Bar MACHINE Similar to chuck MACHINE but with a collet A single- and multiple-spindle bar machines NC Lathe7 Boring MachiningHorizontal Boring MachiningVertical Boring MACHINING Boring Cutting is done inside diameter of the work

2. Drilling & Related Operations • Geometry of Twist drill – Shank, Neck and Drill body – Helix angle, Point angle, Flute, cutting edge, Chisel edge, Margin • Cutting conditions. D v N. π Spindle: = Feed rate: r = f Nf. Metal Removal Rate: 4. 2 MRR =π. D f. r. Machining time: r m. f t A T + = For a through hole. For a blind hole. r m ...

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