MANUFACTURE ENGINEERING - 2

MACHINING OPERATION PERFORMED ON LATHE

Kishan SavaliyaME-2 (136540319101)

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Engine Lathe

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Diagram of an engine lathe, showing its principal components

Machining Operations

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Generally performed after other manufacturing processes (casting, forging, …) Other processes create the general shape of the work part Machining provides the final shape, dimensions, finish, and

special geometric details that other processes cannot create

Most important machining operations: Turning Drilling Milling

Other machining operations: Shaping and planning Broaching Sawing

Primary Machining Parameters

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Cutting Speed – (v) Primary motion Peripheral speed m/s ft/min

Feed – (f) Secondary motion Turning: mm/rev in/rev Milling: mm/tooth in/tooth

Depth of Cut – (d) Penetration of tool below original work surface Single parameter mm in

Resulting in Material Removal Rate – (MRR)MRR = v f d mm3/s in3/minwhere v = cutting speed; f = feed; d = depth of cut

Turning

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A single point cutting tool removes material from a rotating workpiece to generate a rotationally symmetric shape

Machine tool is called a lathe

Types of cuts: Facing Contour turning Chamfering Parting (Cut-off) / Grooving Threading

Turning Parameters Illustrated

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Drilling

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Creates a round hole in a workpart Contrasts with boring which can only

enlarge an existing holeCutting tool called a drill or drill bit Customarily performed on a drill press

Milling Parameters Illustrated

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Facing

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Tool is fed radially inward

Contour Turning

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Instead of feeding the tool parallel to the axis of rotation, tool follows a contour that is not necessarily straight (thus creating a contoured form).

Right & Left Hand Tools

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Right Hand Tool: Cuts from right to left

Left Hand Tool: Cuts from left to right

Chamfering

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Cutting edge cuts an angle on the corner of the cylinder, forming a "chamfer"

Parting (Cutoff) / Grooving

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Tool is fed radially into rotating work at some location to cut off end of part, or provide a groove

Threading

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Pointed form tool is fed linearly across surface of rotating workpart parallel to axis of rotation at a large feed rate, thus creating threads