This is a basic spinning compost bin. I built it using (4) 2x4x10's. I had home depot cut them in half before bringing them home. The barrel was $20 from our local feed store. I included some measurements, but yours will depend on what size barrel you use. Mine is about 20" wide and about 3 feet tall.
If you have questions, please message me and I'll include narrative on whatever is unclear.
Total Cost - Approx. $50
Assemble all your materials.
Cut three of your boards in half.
Cut two of the halves in half. Those will end up being the cross piece of the "A" frame, and the cross pieces between the two "A" frames.
Arrange the two boards upright. Place one of the 2 1/2' cross pieces about half way up the "A". That will determine where you need to draw your lines at the top and bottom of the frame. Cut, the pieces and screw together using 3" wood nails.
Add the cross piece of "A" frame (Inside works best).
Screw galvanized post hardware down to cross piece.
Use your last two small pieces to attach the two frames. (Make sure your barrel will clear them when you turn it.)
Drill (2) holes in your barrel that will fit your pipe, about half way up. Use PVC pieces as spacers. Drill many small vent holes in your barrel.
Cut (5) 45 degree cuts in your last board (Cut the first one and use it as a jig). Those will ad corner support and structural integrity to your compost spinning frame. (again, make sure your barrel will clear them.)
Turn food waste into compost. enjoy.