A pin or shaft on a crank mechanism that connects the crank to a connecting rod, commonly used in engines and machinery.
Compound word from 'crank' (a bent lever or handle) and 'pin' (a fastener). The term originated during the Industrial Revolution when engineers needed precise terminology for mechanical components that transmitted rotational motion.
The crankpin in your car's engine performs millions of tiny coordinated movements every hour—it's one of the most cleverly designed joints in mechanical engineering, converting the explosive force of combustion into smooth rotation!
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