A crank is single slider crank mechanism pdf arm attached at a right angle to a rotating shaft by which reciprocating motion is imparted to or received from the shaft. It is used to convert circular motion into reciprocating motion, or vice versa. The arm may be a bent portion of the shaft, or a separate arm or disk attached to it.
The end of the rod attached to the crank moves in a circular motion, while the other end is usually constrained to move in a linear sliding motion. The term often refers to a human-powered crank which is used to manually turn an axle, as in a bicycle crankset or a brace and bit drill.
In this case a person’s arm or leg serves as the connecting rod, applying reciprocating force to the crank. There is usually a bar perpendicular to the other end of the arm, often with a freely rotatable handle or pedal attached. Fishing reel and other reels for cables, wires, ropes, etc.
The carpenter’s brace is a compound crank. The crank set that drives a handcycle through its handles. The crankset that drives a bicycle via the pedals.
The cranks are incorporated into a crankshaft. This difference becomes significant in high-speed engines, which may need balance shafts to reduce the vibration due to this “secondary imbalance”.