A plate like that is expensive; costs about $100. Plus, it has to have holes drilled through it so that the hammer can be bolted down to it. Drilling a 3/4-inch hole through a 5/8-inch plate is NOT an easy task.
I decided, for this hammer, to pour a concrete pad as a base. The pad I decided to pour is 4-foot x 3-foot. It took about 12, 80-pound bags of concrete so it weighs about 960 pounds. In order to strengthen the concrete and keep it from moving anywhere, I used a steel support system.
First I drove nine pieces of steel into the ground about 2-feet, letting the rods stick up from the ground about four inches. Then I made a criss-cross grid of steel rods, so that the rods would be in the center of the pad. (The pad is six inches thick and the rods are about 3-inches off the ground.) This will greatly strengthen the concrete. I used scrap plywood as my concrete form.
With the form leveled and squared up, and the steel supports in place, it was time to pour concrete.
So step one:
TURN ON THE MUSIC!
This is my new CD/Tape player that my grandma got me for Christmas.
Get the concrete!
Get some water!
Get the hoe for mixing.
Get the wheel barrel.
Mix the concrete and pour it in.
Position the concrete where needed and smooth.