Possum wrote:Seems the core diameter did not change from 500 to 650; just the journal diameter from 600 to 750.
Possum wrote:I measured 500cc, 600cc & 650cc and found them all to have a 1" I.D. big-end journal core.
Rohan wrote:Not at all - have a look in any standard engineering textbook.
Having a hole through the middle distributes the stresses around the shaft.
Depending on the dimensions, this means a large circular hollow shaft is usually (much) stronger
than a smaller solid shaft, for the same metal.
Ribs fillets and fillers in aircraft often have hole(s) in them for the same reason.
How about a 1.625 diameter hole, leaving 0.062 wall thickness?
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