I was changing out a 12" miter saw blade that had lived a decent life but needed retirement, and wondered how it might be re-purposed. I came up with the idea of making a Lazy Susan turntable for the grill that could double as a weapon if the zombie apocalypse happened to drop at the same time you happened to be fixing up some burgers. I call it the Lazy Sawsan, pun intended.
12" used miter/table saw blade
Lazy Susan ring (about 4 bucks at Home Depot)
Scrap plate aluminum
Angle grinder with metal cut off wheel, grinding wheel and buffing wheel
Drill (preferably drill press)
Welder (or optionally epoxy would probably work fine)
Step 1: Preping the Blade
Step 2: Creating the Base Plate
Now put the Lazy Susan mechanism on the cut out square. Mark where you will drill holes to mount the Lazy Susan to the base. Take a center punch if you have one and give it a tap on each of the dots you made on the base, this will help to make sure your drill bit doesn't track and that you get the holes where you want them. This isn't super critical for soft metal like aluminum but can't hurt. Now, drill the holes with a bit the same diameter as the holes on your Lazy Susan mechanism.
Step 3: Attaching the Base Plate to the Lazy Susan Mechanism
Once your pieces are set up so that you can hand tighten the whole thing together do so, then tighten up with a wrench and screw driver. Then you probably need to put a few drops of oil or bearing grease into the Lazy Susan mechanism. This one called for it specifically, check your packaging... I just put a couple drops of 3 in 1 in there and spun it around. Don't overdo it.
Step 4: Attaching the Base to the Blade
In order to make this thing work and look really nice you want to center the blade on the Lazy Susan mechanism. To do this use your quick square or other straight edge and draw two lines through the middle of the blade on the non-polished side splitting it into exactly even quarters. The easiest way to do this is to line your straight edge up with the front of the saw teeth on opposing sides of the blade.
Once you have your lines drawn put your base on the blade and line up the holes on the Lazy Susan half not attached to anything on the lines you drew. If you have the lines bifurcating each hole as shown in the picture, you have centered the Lazy Susan mechanism on the blade, it's that simple.
Now just weld a couple of points, one on either side of the corners. I used my wire feed welder. This will hold very nicely. Clean it up with a wire brush. You could probably use epoxy here if you can't weld or don't have a welder.
Flip the piece over, you may have a couple of dark spots on the other side now from the welding, these will buff out without a problem and you'll be left with a nice completed project. Throw it on a grill or in the kitchen or just use it as your garage project turntable or whatever and enjoy.