I want to mount a piece of wood on 1 wrought iron bracket at the side of a framed window with the shelf running about 3 feet across the window and no bracket on the other side. How can I determine how much weight it will hold with only 1 bracket. I want to put plants on the shelf. (this is a picture window so I don't want the shelf do go across the entire window)
closed as off-topic by isherwood, Daniel Griscom, Machavity, manassehkatz, Jack Mar 17 at 4:17
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It's kind of a physics question but to point you in the right place
Torque = radius x force
Torque it the twisting at the anchor point
Radius is the center of mass So the further from your anchor the more torque
Force is lbf or just lbs will be fine for the application.
To find the centre of mass (radius) take your shelf and find the balance point. Probably the centre so 1.5'
Weigh it we'll say 10 lbs
Torque =1.5 feet x 10lbs So 15 foot pounds torque.
Now you add what you want to put on your shelf but keep in mind that center of mass changes the farther out you go.
And you need to cross reference your iron to see its capabilities.