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Ransome Mill engine weighted flywheel?

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Andrew Entwistle	14/04/2015 10:58:54
120 forum posts 218 photos	Hi, I have just started construction of the Hemingway Ransome Mill engine and when setting up the flywheel on a faceplate I noticed that there is quite a runout on the inside diameter of the rim with respect to the rim outer, groove and the hub. I wonder is this intentional to provide balance weight against the reciprocating action? There is no mention of this in the drawings or in the ME construction article from 2001. Andrew.
JasonB	14/04/2015 12:25:46
25215 forum posts 3105 photos 1 articles	I don't think it is designed to be balanced. Its usual to set the INSIDE of a cast flywheels rim to run true as that is the hardest part to clean up and then machine the rim and bore to suit, in a bad case the outside of the hub may also want a quick pass to clean that surface up. At least thats the way I always set them up. J
Andrew Entwistle	14/04/2015 13:50:27
120 forum posts 218 photos	Thanks Jason, it is reassuring to hear that the eccentricity is not likely to be to do with balancing - because I have already machined the inside of the rim true to a profile using a silver steel form tool and the rotary table! I think this approach was unavoidable because the inside was simply not round. I did a quick calculation of the mass of the eccentric material removed as around 20g which only represents about 4% of the rim mass of the 7" flywheel. Andrew.

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