My first post here.
I've spent some time making a little shelf for my microwave oven. I'd estimate that it weighs around 15 Kgs.
I made a plywood shelf with 4 wall brackets supporting it. The edge brackets have cross members and the middle brackets are plain L clamps. Here are two pictures.
The screws which fit the whole thing onto the wall are 2" masonry screws fixed with fischer wall plugs. Each clamp has two screws that fix it onto the wall and two screws that hold it to the body of the shelf. These are 1" self boring screws.
Since the whole thing is like a cantilever arrangement, there is a bit of play when I open and close the microwave. Apart from that, it feels stable. Also, I initially used 1" screws to fix the thing onto the wall and it wasn't enough. Because of this, I'm still not totally confident about it.
I'd appreciate any comments on how I can strengthen it and how I can check whether it'll be strong enough.
My kitchen is quite small so putting something like this gives me valuable space.