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JohnG - no I just corrected some basic errors two folks thinking about the forces involved - that doesn't definitely answer my question - it merely pointed out fallacies in trivailsing this problem too far to get your answer - as pointed out by the very next reply.
Al - your'e totally right I haven't considered any of vibration, nor resonant frequencies. There must be an ideal bar lenght for a carrying capacity and set of materials; but I wonder what formulea determines this. I think vibration would increase with a longer shaft holding a lighter mass, but possibly the vibration is minimal. As is I assume the bar isn't normally vibrating unless forces are acting on it. Mines in a shed - so rule out wind etc. That leaves bumps or movement due to the motors, particularly RA.
Personally I ponder having too light a weight means too much momentum to absorb when you are nearing completion of a goto movement.
If I can find a mild steel bar 50 cm by 2 cm I might thread it so I can conduct this experiment to see what results. Also I may dash an e-mail off to Celestron to see what their engineers think!
Jase - great links - thanks!
PS
A Paramount at $16K would be my dream!
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