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converting steam loco to roller bearing rods
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[quote]QUOTE: <i>Originally posted by timz</i> <br /><br />[quote]QUOTE: <i>Originally posted by M636C</i> <br /><br /> <br />For roller main bearings, you might need new axles, but at the very least, you would have to press the wheels off, machine the bearing surfaces, fit the roller bearings, the fit the wheels. You would also have to accurately "quarter" the wheels, putting the cranks at exactly 90 degrees. <br />[/quote] <br /> <br />Why do roller-bearing axles require accurate quartering? <br />[/quote] <br /> <br />Quartering has nothing to do with the type of bearings used. Quartering is done so that both cylinders won't be at "dead center" at the same time. Accuracy is important but consistency is much more important. All of the axels have to be quartered exactly the same. That is, if one is 90.5 degrees and the other is 90 degrees and a third axel is at 89.5 degrees you are going to have a failure (perhaps a catastrophic failure) of one or more side rods since the distance between the crankpins will be constantly changing. I don't want to be anywere near when that happens. <br /> <br />
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