|
Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
|
"We want it rigid enough so there isn't the vibrations that come from thinner structures"
That's not the most refined spec there. Perhaps find a spiral stair case that you like and copy it. ...or ping it with a hammer, record the note, tell an engineer that's the spec. D-flat, or whatever.
Just saying, everything has a natural frequency.
__________________
Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
|