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Finding power transmitted by a pulley

Here is a real life mechanical problem to solve – Two parallel shafts whose center lines are 4.8m apart are connected on an open belt drive. The diameter of the larger pullet is 1.5m and that of the smaller pulley is 1.05m. The initial tension in the belt when stationary is 3KN. The mass of…

Cut Plier – Wiring man’s freind
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Cut Plier – Wiring man’s freind

Schematic for mighty cut plier – Cut plier in almost indispensible for any wiring work. Pliers are used for gripping or holding small objects by manual operation. Different types of pliers are used while working electrical stuff or other kind of mechanical work. As shown above, the cut plier is used for most of the…

Outside Caliper
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Using Outside Caliper – Physical data gathering

Outside caliper is a two legged precision instrument used for measuring or comparing thickness diameter and outside dimensions. The legs are tapered inwards and their ends are thin to make accurate measurement. The size of this caliper is found by taking the perpendicular distance from the center of the rivets to the leg points. If…

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Basics of Mechanical Fitting and safety

Fitting is the assembling together of parts and removal of metals to secure necessary fit. Following safety measures need to be taken in fitting workshop – 1. Files must have well fitted handles 2. See that work piece is perfectly clamped or fixed in the vice. 3. Never use hammers with loose heads. 4. Use the…

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Using a Steel Rule

Steel Rule is a measuring instrument used as a standard for measuring materials. It is made of stainless steel. The most convenient for the general purpose is a 12 inch rule as shown in below schematic – For small jobs, a pocket rule 6 inch long is very useful. In measuring, the graduation should be…

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Scriber

A scriber is a marking tool. It has a straight pointed tip and a bent pointed tip. It is used for marking and drawing straight lines by using a steel rule. Schematic for a Scriber is as shown below –

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Hammers

There are various types of hammers in use. The most commonly used hand hammer is Ball-Pane hammer. Other types are Cross Pane hammer and Straight edge hammer. Schematic of a Ball pave hammer is as shown below – Hammers are made of cast steel. A wooden handle is fixed on the hammer to use it…

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Pipe Wrench

Pipe Wrench is a type of adjustable spanner which has wide use in tightening or loosening nuts and taps. It has one fixed jaw and one movable jaw and a handle which is a continuation of the movable jaw. The nut or tap to be loosened or tightened is held tightly between the jaws and…

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Bench Vice

Vice is a device for holding work. There are various types of vices and the most common one is the Bench Vice. It consists of a movable jaw. Movable jaw has a square or butter threaded spindle. There is a spindle handle also by which the movable jaw can be brought to any desired position. A…

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How to use a File

File is another cutting tool and is available in a variety of lengths, grade cuts and shapes. Files are made of high carbon steel and is attached to a handle. The file has a series of teeth set at an angle which cut the work on the forward stroke. Files have generally 3 types of…

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How to use a Hack-Saw

Hack-Saw is a cutting tool used for cutting metal pieces, wide grooves etc. It consists of a metal frame fitted with handle made of wood. A blade of suitable size is fitted to the frame as shown below – Usually the blade manufactured are 8inch, 10inch and 12inch, The blade has bent teeth. As the…

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How to use a Centre Punch?

Centre Punch is the commonest of all punches and is a steel rod 90 – 150 mm long and 8 – 13 mm in diameter. It is used to make marls at the centers of holes which are to be drilled and to make marks on a line through which a metal is to be…

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Try Square

Try Square is used to test the smoothness of surfaces and to test the perpendicularity of a surface with respect to an adjacent one. It consists of a stock and blade fixed together at 90 degree to each other. The stock acts as a fence and the blade as a guide in marking.