Quote:
Originally Posted by AndrewJ
Gday Peter
The strength/stiffness/deflection calcs are only part of it.
Deflection is very rarely ever the controlling factor in a pier.
ie take an identical tuning fork design ( ie same moments of area etc )
Make one from tuning fork steel and one from bog std Mild steel.
Totally different end results :-)
And again i put it that if the knock/vibration is induced via the mount or OTA, then no amount of pier strength will save you.
Andrew
( also did Mech engineering incl vibration analysis )
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Not sure where you are going with this...but surely not to suggest 3x stainless steel bolts at the top is the best to preserve the stiffness of the lower section of Al’s beaut pier.
Other than in the Hubble, small perturbations can and do go un-noticed in many a telescope...I’ve bumped my head occasionally on the 50kg of counterweights on my mount...and often exclaimed “gosh” or “golly”
. ....anyway, the post-concussion subexposure was fine.