Rotary to Left-Right | Hindi | Amazing Machine

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In this special machine as you rotate the pulleys the stick on top moves from left to right but does not fall down. Hence the name of the machine ROTARY TO LEFT-RIGHT. You will need old CDs, rubber discs, screws, washers, rubber glue and a wooden piece. First we need to improvise two big size pulleys. This is done by sandwiching a slightly smaller rubber disc between two old CDs. Apply rubber glue to the rubber disc and stick two old CDs on its side. There will be a groove in the pulley for the rubber band. As the middle hole in the CDs is too big you will need to stick two washers on both sides of the pulley with rubber glue. Then place a slightly loose steel screw in the pulley washer. The pulley must spin freely on the screw axle. Mount the two pulleys on a wooden board. Fix a screw handle on the right pulley. Then join the two pulleys together with a big rubber band in the normal way. The stretched rubber band will have a shape of an ellipse. On rotating the handle both pulleys will spin in the same direction. If you place a stick on top of the two moving pulleys it will soon slide to one side and fall down.
Now join the pulleys in a special way. Place the rubber band in a figure of eight or a cross formation. Now on rotating the handle both pulleys will spin in opposite directions. If the right pulley rotates clockwise the left side will rotate anti-clockwise. Now place a yellow straw in the crevices of both pulleys. On rotating the handle you will be surprised that the straw keeps reciprocating from left to right and does not fall down. The stick on top reciprocates and balances its weight in such a manner that it does not fall down. This work was supported by IUCAA and Tata Trust. This film was made by Ashok Rupner TATA Trust: Education is one of the key focus areas for Tata Trusts, aiming towards enabling access of quality education to the underprivileged population in India. To facilitate quality in teaching and learning of Science education through workshops, capacity building and resource creation, Tata Trusts have been supporting Muktangan Vigyan Shodhika (MVS), IUCAA's Children’s Science Centre, since inception. To know more about other initiatives of Tata Trusts, please visit
Pulleys with scale, pulleys, how pulleys work, physics

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