Steve B wrote:
I want to build an overhead trolley system with a hoist on it. I want to
let one end of the top I beam extend past the support so that it will stick
out over a pickup bed to unload the truck. Where can I find out what the
max load is going to be for the length of stickout for a particular beam?

Steve


for 6 feet of stick out with a load of 1500 lbs at the end of that stick
out , using a single beam ,

s12x31.8 lb per foot beam

you get .0951 deflection at the end of the beam

you get a max bending stress of 2970 psi at the support 6 feet from end

this is a safty facto of 10


using an 8 inch S8x23 lb per foot

you get .32 inch of deflection at 6 feet with 1500 lbs

the max bending stress is 6660 psi at the last support , this would be a
safety factor of 6 for a 1500 lb load [ about the max in a half ton pick up


the problem is going to be pushing that load up the 3/8 inch deflection hill

if you can build support into the top of the beam and use an underhung
trolly you could safely use a 4- 6 inch beam , but this would take an
engineered support for the top of the beam

also remember that as you load the cantilevered section it will create a
pulling load on the supports past the closest support to the load


also i can email beam boy zips to any body who needs one the web site
seems to be down


i can also design supported beams and engineered gussets if you need them .

no p.e. stamps mind you , that costs more as i have to walk to the end
of the office to have the boss stamp it