Step 1: Materials
- 1/2 inch hardware cloth
- two large surplus bicycle rims
- 4 rollers and bolts to attach
- a little over 8 feet of dimensional lumber
- misc. wires for connecting the hardware cloth to the rims
Step 2: Remove the spokes from the rims
Step 3: Cut the hardware cloth to fit inside the rims
Step 4: Attach the hardware cloth to the rims
Step 5: Build the roller box
Note that these dimensions assume that you are using the same diameter rims that I used. If you use different size rims then obviously you will need to modify the dimensions to accommodate your particular arc.
To align your rollers place the finished drum onto the roller box and then mark your roller positions. You may want to attach the rollers first with simple drywall screws (as I did) to test their positioning and then drill and bolt them later once you are happy with the alignment.
Step 6: Done
If you have a large quantity of material to screen you may want to find a buddy who will keep turning the drum while you continue shoveling jmaterial. If you are working alone then you will have to load a couple shovelfuls into the drum and then give it a few turns yourself before loading more compost. Or if you are really mechanically inclined you could figure out how to hook up an electric motor like this guy did.