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First a bit of background. I'm building a movie theater in my basement, but the walls are owens finishing system (insuation with fabric), so mounting anything to the walls is impossible. I want to hang 3 movie poster frames on the back wall. I had an idea yesterday, but before I start cutting I need to determine if it will work. Hopefully this is an easy engineering calc, just a bit beyond my expertise.

I am installing kitchen cabinets on the back wall, with full height cabinets on the left and right side leaving 8' in the middle for counter height cabinets.

I would like to attach an aluminum bar to the tall cabinets (spaning 8') to attach the 3 poster frames. Each one weighs 13 lbs, so 50lbs would be the max load. I would like the 6 holes in the bar to be slotted if possible to make adjustment horizontally possible. I would need to know the width and thickness of the bar needed so no sag is experienced, but it is as invisible as possible.

Thank you for your help

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The optimum shape to avoid bending would probably be a L-profile.

For calculating the thickness required given the three loads, some calculation is required. These are basic (essential) static calculations, so there are lots of online sources available:

Click here for a beam calculator.

The calculation needs the sectional moment of inertia of the profile.

The L-profile has a moment of inertia as given in the following web page: click here to visit the page

You'll probably do these calculations either online or by using a spreadsheet calculator, or by hand (/calculator).

Of course, the calculations follow the forward analysis path. This means, you calculate the deflection given a load case and beam design. In order to find the optimum shape, that gives a small enough deflection, you will need to do several calculations.

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