dusty wrote:The first question that I would like answered is "why does Shopsmith set an upper limit at 5200rpm".
Is there a weak point in the system that makes this prudent? I don't think so.
My two machines read 5942 and 5275 at the high end and 758 and 749 respectively at the low end for whatever that is worth.
I believe the 5200 is a nominal design number that establishes the reference from which all other nominal settings are based. It assumes motor load/rpm as well as pulley positioning and tolerances, belt dimensions(both length, width, and amount 'squeezed') and speed control assembly . . .
Nominal is theoretical, not real nor measurable.