Introduction to Crankshaft topic:

Crank shaft mechanical seminar topic explains about a combustion engine the motion of a piston is reciprocating linear. To convert this reciprocating linear motion of piston to rotation the crank shaft is used. The crankshaft is generally abbreviated as crank. The crankshaft has crank throws and crank pins to convert the linear motion into rotation. 

For good results and low costs the crank shaft production uses induction hardened bearing surfaces. It also allows the crankshaft to be reground without having to redo the hardening. But high performance crank shafts use nitrification process. This process is slower and costlier than the induction hardening bearing surface. With crankshafts that operate on roller bearings, the use of cauterization tends to be favored due to the high Hertz an contact stresses. 

Most working and highly stressed part in any kind of engine is crank shaft. Therefore every precaution should be taken while making crank shaft. The majority of liberty crankshafts are made by using nickel – chromium steel. minimum physical properties: Elastic limit, 116,000 lb. per square inch; elongation in 2 in., 16 per cent, reduction of area, 50 per centralized impact, 34 ft.-lb.; Brunel hardness, 266 to 321. All crank shafts undergo heat treatment to check its capacity of withstand for high temperatures

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