Picture of French Cleat
What you need

3/4 in plywood
Table saw (TechShop)
Chop Saw (TechShop)
Cordless Drill (TechShop) 
Drill bit (TechShop)
Counter sink bit (TechShop)
Sand paper
Sanding block

The French cleat is an easy way to hang heavy stuff. It simple to make and cheap. One of the members gave me this piece of hard maple, I was going to make some frames out of the wood but as it was sitting at my house I want to see what it would look like on the wall.
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Step 1: Cutting the French Cleat

Picture of Cutting the French Cleat
Rip down the 3/4 ply wood to about 4 inch wide. This may size my various with project to project. Move the blade to 45 degree angle and set the fence to about 2 inches. Rip down your plywood at 45 degrees. 

If you only have a one piece of wood, you can rip the 45 degree angle edge of the ply-wood, and then cut the wood to size on the chop saw. All you really need are two 45 degree angles that can lock in to each other.

Chop saw
Cut down to the size that is needed. When cutting the cleat on the chop saw, be sure to keep the larger surface area on the bed of the saw. The wall mounted cleat should be just a slightly longer.

Step 2: Marking and Drill Holes

Picture of Marking and Drill Holes
You may want to grab sand paper and lightly sand down the shape edge of the cleat.
Mark out cleat where you want the holes to be. Bearing in mind that when you install the cleat that the wall mounted cleat is mounted with the Sharpe point away from the way and it pointing upwards. And the cleat the in on work or cabinet the sharp point the pointing down and away from the work.

I predrill my holes and counter sink them in the cleat. Attach the cleat to your work or cabinet and to the wall. Hang your cabinet or work and you are done.
shannonlove2 years ago
A 30 degree angle usually works better and the traditional french cleat uses that angle.

In the most woods, a 45 degree angle will form to sharp and angle at the tip of the cleat which will be brittle. The tip will break off under pressure or repeated motion e.g. taking things of and on the cleat. 

Quick-tune2 years ago
How about if you were to cut a channel into the wood with a router, the same dimensions as the ply piece, so you would need just one ply cleat mounted to the wall then the mount would be hidden and no need to pack out the bottom to make the wood sit flush?