Conversion of Rotary Motion to Linear Motion

There are many instances when it is required that one type of motion, e.g rotary motion at one point be converted to linear motion at another point, and vice versa.  House hold sewing motor cycle, screen wipers in a motor cycle, printing machine, etc. Have several mechanism which convert one type of motion at one point to a different or similar type of motion at another point, PR motion in another plane, and so on.

   The reciprocating motion of the piston and its energy inside an engine cylinder must be converted into the rotary motion and energy of the rotating crankshaft of the engine. The slider crank mechanism Is utilized to accomplish this task. The piston is referred to as slider.  It consists of a crank, which performs pure rotary motion and a connecting rod (often referred to as con rod) , which connects the crank to the piston. The motion of the con rod is  quite complex, however , it is such that at the connecting point A to the crank, it performs pure rotary motion as the crank, while at the connecting point B to the connecting rod, it performs purr linear motion.

The rack and pinion system converts the rotary motion given to the steering wheel by the driver to the rotary motion of the road wheels.

   The rotary motion of the screw jack is converted to the upward for downward linear motion of the jack. The screw has a square thread which engages the interval thread of the but, which is at the top of a conical base of the jack. The metal worker's vice, and the G clamp, which work on the same principle as the screw jack.