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Ken I was using the formulas on the link you posted for years, but now you have to pay a membership. Guess everyone has to make a living.
Glenn, for your trolley beam the design is usually based on deflection. If the beam bends too much you wouldn't be able to push the trolley up hill as you went to the side. Same as with a boring bar the strength of the material has no effect on that. Totally dependant on material (young modulus of elasticity) , cross section (specifically moment of inertia) and span.
Ran the numbers, for your 1800 pound load in the middle of an 8 foot beam you would get 0.011 inches deflection, not including the beam weight. Might get that much more from the weight of the beam. The calculations were from a new sight I found, was too lazy and its too early to check the numbers by had but that sounds about right for that size beam.
Greg
Glenn, for your trolley beam the design is usually based on deflection. If the beam bends too much you wouldn't be able to push the trolley up hill as you went to the side. Same as with a boring bar the strength of the material has no effect on that. Totally dependant on material (young modulus of elasticity) , cross section (specifically moment of inertia) and span.
Ran the numbers, for your 1800 pound load in the middle of an 8 foot beam you would get 0.011 inches deflection, not including the beam weight. Might get that much more from the weight of the beam. The calculations were from a new sight I found, was too lazy and its too early to check the numbers by had but that sounds about right for that size beam.
Greg