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- Sep 26, 2009
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I was beginning to think my Laverda was the bees Its a bit mind blowing to think that block of Iron can spin that fast. :!:
Roller bearings Also used where minimal side loading is present. They can carry more load than ball bearings but do not tolerate misalignment as well. A roller bearing on the nose of a quick-change ring and pinion is a popular application.
Read more: http://www.circletrack.com/drivetrainte ... z2ICtoMSxt
john robert bould said:I was beginning to think my Laverda was the bees Its a bit mind blowing to think that block of Iron can spin that fast. :!:
Bernhard said:Re ball v needle rollers.
Dances with Shrapnel said:Why would anybody want to use anything but roller (Superblend) style bearings for the main bearings in a Norton big twin.
At the risk of starting an opinion war, I would like to hear some of the pro's and con's of the choices. I see the primary options are 1.) Superblend for both sides, 2.) ball bearings for both sides or 3.) a Superblend type for the drive side and a ball type for the timing side. I guess I am trying to flush out the rationale for any given choice which can range from keeping it original, this is the way we always did it, serviceability, absolute need or ????????????
Keep in mind that the Superblend style solution was either not known, not needed and/or not available in the early years of the Norton big twins.
Matt Spencer said:
nortonmargarita said:This is really simple, I wrote a technical article in the Norton Notice back in 1996 or so.
Bearing catalog information lists roller bearings having about 1/3 the tolerance for misalignment as that of comparable ball bearings (4' versus 12'). At the center of the Norton crankshaft this roughly equates to between 0.003" and 0.010" respectively of total deflection; not a lot. It would be interesting to get a crankshaft into V-blocks and measure/chart load versus deflection; not necessarily to destruction but just to get a sense of load versus deflection. We know out of balance forces are in the tons and I suspect these loads will result in deflections greater than 0.010". May do this myself when I get to the shop and find a load cell.