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QUOTE: Originally posted by M636C 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.
QUOTE: Originally posted by ndbprr The first steam engine to have then was the Timken "four aces" #1111. I believe it was used on one of the Great Northern silk trains for a long time. The differences in rods are quite apparent if you look at a picture of the N&W J class side rods. In general the head where the crank pin is inserted is much larger than a standard rod to accomodate the roller beraing (not a ball bearing).
QUOTE: Originally posted by timz QUOTE: Originally posted by M636C 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. Why do roller-bearing axles require accurate quartering?
QUOTE: Originally posted by timz QUOTE: Originally posted by ndbprr The first steam engine to have then was the Timken "four aces" #1111. I believe it was used on one of the Great Northern silk trains for a long time. The differences in rods are quite apparent if you look at a picture of the N&W J class side rods. In general the head where the crank pin is inserted is much larger than a standard rod to accomodate the roller bearing (not a ball bearing). You seem to be saying the 1111 had roller bearing rods. It didn't, did it?
QUOTE: Originally posted by ndbprr The first steam engine to have then was the Timken "four aces" #1111. I believe it was used on one of the Great Northern silk trains for a long time. The differences in rods are quite apparent if you look at a picture of the N&W J class side rods. In general the head where the crank pin is inserted is much larger than a standard rod to accomodate the roller bearing (not a ball bearing).
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