LATHE MACHINE OPERATION - FACING

• This is an operation of removing metal from the work-face by feeding the tool at right angles to the axis of the work.

PURPOSE OF FACING

• To have a reference plane to mark and measure the step lengths of work.

• To have a face at right angle to the axis of the work.

• To remove the rough surface on the faces of the work and have finished faces instead.

• To maintain the total length of the work.

PLAIN TURNING

• Rough turning, using roughing tool or knife tool.

• Finish turning using a finishing tool.

GROOVING

• Grooving is the process of turning a grooved form or channel on a cylindrically turned work piece. The shape of the cutting tool and depth to which it is fed determine the shape of the groove.

TYPE OF GROOVES

• Square grooves• Round groove• `V`shaped groove

CHAMFERING

• To remove burrs and sharp edges from the turned components to make their handling safe.

• To permit for easy assembly of mating components.

• To provide better appearance.

MATHOD OF CHEFERING

• Form tool method• Filling method• Compound slide method

TYPE OF KNURLING

• Diamond knurling• Straight knurling • Cross knurling• Concave knurling• Convex knurling

TYPES OF MANDRELS

• Expansion mandrel• Gang mandrel• Stepped mandrel• Screw or threaded mandrel• Taper shank mandrel• Cone mandrel

DRILLING AND BORING

• Drilling is the operation of originating circular holes. The tool employed for this purpose is a drill.

• Two different method are employed in a lathe for this operation.

• Work is clamped in the headstock in a chuck or on the faceplate. The drill is held in the tailstock and fed.