Posted by T_Bone on December 18, 2008 at 11:29:59 from (4.254.166.121):
In Reply to: Gantry crane posted by robertmn on December 17, 2008 at 20:33:51:
Hi Bob,
Your design calls for a ZERO deflection on the I-beam at maximum load weight. Any deflection of the I-beam would allow for too much side loading of the vertical supports that will cause the vertical supports too kick out at the bottom.
Just guessing but it appears to be a 12ft span on a 6" I-beam? That's not very much load weight. Your existing chain fall load rating will far exceed your structural design load rating.
Then there's a design problem at the I-beam too vertical tube support connection. The I-beam should have been placed on "top" of the vertical supports and not on the side.
Be careful here as I would like too see your threads next year on your completed projects.
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