Author Topic: what type of machines are needed to balance piston rods and cranks on chainsaw  (Read 704 times)

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Offline huguenot ny

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i would like to know what type of machines and ways there are to balance cranks and piston and rod assemblies

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Offline 660magnum

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The general practice is to make the counterweights be the total of the weight of the crankshaft end of the rod and half the weight of the piston, ring(s), circlip(s), wristpin, and small end of the connecting rod.

On a single cylinder engine, balance is always a compromise so dynamic balancing is sometimes used to reduce the vibration.
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Offline Al Smith

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On an auto type engine it's a little complicated .The rods are balanced as per weight in general plus dynamically big end to small end .Pistons have weight "bosses " which are milled to get the exact weight for each assembley .In modern production methods it's all done on CNC machinery . I would have no idea how a person using standard manual machine tools would do it .

 

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