This is my first attempt at an instructable and my first attempt at making a compost tumbler. The research I've done on different compost bins leads me to believe this style works best.
Step 1: 55 gal. barrels / drums
This seems to be the toughest step for DIY'ers trying to make a compost tumbler. Where can you find large plastic 55 gal. drums? My advice is to keep your eyes open when you're out and about. We've all seen them at some point, but never pay attention as to where or when. LOOK... you will find them. I planned on cutting the bottom off of one to make a door, but thought of a better idea so I could make two tumblers.
Step 2: Cutting the door
For this step I used two templates to make a hole and a door. I cut the hole into the bottom of the barrel and filed off the edges. Make sure you use the bottom of the barrel, as you'll need to make use of the top later.
I found a large piece of scrap plastic to make a door. Again, I traced the template, cut, and filed the edges.
Step 3: Attach the door
Here I have attached the door using a door hinge and two barrel latches.
Step 4: Drilling pivot holes
This tumbler works by spinning the barrel end over end. I'm using 1.25" steel pipe to feed through the barrel. You'll need to drill the same size holes through the PVC pipe that will be used on the inside of the container. The PVC is attached to the screw cap holes in the top of the barrel and allow air to flow into your compost.