Chainsaw Repair

Chain - Grinders - Filing - Wood Milling - Tools - Welding - Machinist - Mowers - Tillers => Tool Shed => Topic started by: huguenot ny on April 01, 2012, 03:59:25 am

Title: what type of machines are needed to balance piston rods and cranks on chainsaw
Post by: huguenot ny on April 01, 2012, 03:59:25 am

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

Title: Re: what type of machines are needed to balance piston rods and cranks on chainsaw
Post by: 660magnum on April 01, 2012, 08:44:30 am

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.

Title: Re: what type of machines are needed to balance piston rods and cranks on chainsaw
Post by: Al Smith on April 08, 2012, 09:52:53 am

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 .