Stability of a high center of gravity Crane
Stability of a high center of gravity Crane
(OP)
Hello
My question evolves the evaluation of the mobile gantry crane (on rollers) and making sure I have adequate base, thus preventing “tipping”. How can I determine a minimum length of the base members?
Thanks
My question evolves the evaluation of the mobile gantry crane (on rollers) and making sure I have adequate base, thus preventing “tipping”. How can I determine a minimum length of the base members?
Thanks





RE: Stability of a high center of gravity Crane
Best regards,
Matthew Ian Loew
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Stability of a high center of gravity Crane
Thanks for responding, I was starting to think it was a dumb question(we all know what our profs. said about that). this project is odd in it self as the gantry crane is being dessigned for a client who wishs to use it in his home garage to pull engins. It gets better with a 2000lbs lifting and a 12ft lift hight. Plus I'm not sure where to place it in the codes (industrial or home) so I selected a safety factor of 2. I've started with a assumed 5ft base of W150x22. In theory there is no horizontal forces acting the CG. So as you can see it is some what odd problem
Thanks again
RE: Stability of a high center of gravity Crane
Cheers
Greg Locock
RE: Stability of a high center of gravity Crane
I very much suggest that you open a crane code design book to look at requirements for mobile cranes and at a design safety factor. Because its one of design I suggest that you consider (on ultimate load) of at least 8 to 10, not less. That is 5 to 7.5 on yield, and test it with a load 3 to 4. Photograph and record the test to keep a record that it has been tested.
The test should be at the worst expected position of work,including tipping. Then you can sleep a night when the guy lifts the engine out and at the same time lifts the whole car because something got snagged.
RE: Stability of a high center of gravity Crane
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