TOPIC- Bench work Tools It’s Uses & Process

PREPARED BY:LAL CHAND SHARMA(from icar year 2014-18)

SHAILESH K. MEENA

MISCELLANEOUS TOOLS:-1.Punch2.Calipers3.Screw Drivers4.Drills5.Taps

BENCH WORK PROCESSES:-

1.Marking 2.Chipping3.Sawing 4.Filling5.Draw Filing

PUNCH

Used for marking purposeMade by steel rodGenerally length is 90mm to 150mm and diameter is 8mm to 13 mm

•Used for measuring the dimension of component.

•Easy to use.

•Used for rotating the screws.

•Various size is available for various screw heads.

•Used for making different types of holes according to requirements.

Types of drills:•Flat drill (used for wood work)

•Twist drill(used for metals work)

•Drills are made of high carbon steel.

TAPS Used for cutting

internal threads in cylinderical holes.

TAPS

TAP WRENCH

•Used for cut threads on a round bar of metal.

•Die is a round or a square block of hardened steel.

•Die may be solid or adjustable type

MARKING Marking can be done by

setting out dimensions with a help of a working drawing.

The surface to be Marked is coated with either a paste of red led or a chalk and allowed to dry.

Lines in a horizontal direction are scribed by scribing gauge.

Lines at right angles can be drawn by first turning the work through 90 C and then using the scriber.

Lines can be marked with the help of try square.

Circles and arch on flat surface are inscribed by using dividers.

Indentations on the surface are made using the center punch and hammer along scribed lines and arcs.

The punch mark helps for further operations like filing ,chipping and drilling

CHIPPING This operation used for removing the excess metal by

using cold chisels.

The cutting angles of chisels differs for different metals.

To make easy and effective we used lubrication and cooling of the cutting edges during removal of large amount of metal.

Types of chisels

SAWING This operation used for cutting different metal.

For sawing the saw blades should be properly fitted and stretched to have the proper tension.

Cutting teeth should be away from the operator so that to cut the metal in forward stroke.

Sufficient pressure should be exerted in the forward stroke and this be released during the backward stroke.

FILING Filing is a cutting process.

It cut the metal during the forward stroke.

The pressure of hand in filing should be applied during the forward and relive during the backward stroke.

DRAW FILING Draw filing is used for

finishing the surface.

A flat file of fine cut is used for this.

For draw filing operation the file is held flat on the surface between the two hands.

The file must move forward and backward.

CROSS FILING