Lathe Operations

To

Major Variables used for Lathe operations § The major independent variables (that can change directly) in the cutting process are: ØTool & Work piece material and their condition ØTool shape, surface finish, and sharpness

Lathe Operations Ø Turning ØDrilling Ø Boring

ØKnurling Ø Parting

Ø Facing ØThreading

Turning qThe process of reducing the diameter of a part to a desired

Types of Turning

Taper Conto Form turni ur turnin ng g

The figure below displays operations related to turning

Drilling q

To create round holes in workpieces by using a rotating tool. drill or drill

Two types of holes can be made:

•

In which the drill exits the opposite side of (a)

•

In which the drill does not

(b)

Step drill

Core drill

Twist drill

Boring q Boring is an operation in which a hole is enlarged with a single point

• Circular internal profiles in hollow work-

• For large work-

Knurli ng Producing a cross-hatched pattern on the outer diameter of the work-piece by using a knurling tool

Parting The process of making narrow

WORKING PROCESS OF PARTING § Parting uses a bladelike cutting tool plunged directly into the work piece to cut off the work piece at a specific length §Normally used to remove the finished end of a work piece Parting from the bar stock Tools

Faci ng of material from the Removal

flat end of a cylindrical part.

• Facing is often used to improve the finish of surfaces that have been parted.

APES OTHER THEN CYLINDRICAL

qFacing is the process of removing metal from the end of a work-piece to produce a flat surface. qMost often, the workpiece is cylindrical, but using a 4-jaw chuck you can face rectangular or

SAFETY PRECAUTIONS

vWhen a lathe cutting tool removes metal it applies considerable tangential (i.e. lateral or sideways) force to the work piece. vTo safely perform a facing operation the end of the work piece must be positioned close to the jaws of the chuck. vThe work piece should not extend

Threadi ng A pointed tool is fed

linearly across the outside diameter of the work-piece at a large feed creating

INTERNAL THREADS • Internal threads in work pieces can be produces by tapping.

• A tap is basically a threading tool with multiple cutting teeth.

Machine Taps Gu n

Stubflute Spiral-

Flute less Tap § Actually a forming tool used to produce internal threads in ductile material – Copper, – brass, – aluminum, and leaded steels

Flute

Lobes of

Types of Screw threads

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