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SCOTCH YOKE MECHANISM

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  SCOTCH YOKE   MECHANISM  INTRODUCTION: The scotch yoke mechanism is a simple mechanism for changing the linear motion of a slider into rotary motion or vice versa. The parts of this device include a sliding bar, a yoke on the bar with a slot cut out, and a smaller bar connected to the yoke and fixed by a pin through the yoke slot to the slippery bar. The scotch yoke mechanism is used to convert the rotary motion of the crank into sliding motion. As the crank rotates, the horizontal portion of the link slides or reciprocates in the fixed link. Scotch yoke mechanism is obtained when one of the sliding links of a double slider crank chain is fixed. fig. scotch yoke mechanism The advantage of scotch yoke mechanism over the slider crank mechanism is that it has lesser moving parts and smoother operation. This mechanism is most commonly used in control valve actuators in high pressure oil gas pipelines. It is also used in various internal combustion engines.  As the bar slides back and for
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DRAG AND LIFT FORCE

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                            DRAG AND LIFT FORCE IN our daily life we can feel drag when you walk in a swimming pool, water pulls us and a fisherman feels the drag on his lure as he pulls it through the water. In the Aerodynamics an airplane flies there is also concept of drag and lift force is use while designing the parts of airplane. Kites can fly because of the forces acting on the parts of the kite these force nothing other than drag and lift force. Though kites come in many shapes and sizes, the forces which act on a kite are the same for all kites. In this blog we are going to see what is drag and lift force and how it is acting on the body. Lift is a force that acts at a right angle to the direction of motion through air. Lift is created by difference in air pressure. Thrust is the force that propels a flying machine in the direction of motion. Engines produces thrust. Drag is the force that acts opposite to the direction of the  motion.                fig. fisherman feels the
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