Sorry, I haven't been here for a while. Thanks for the kind words.
< I was wondering if the bin is completely above ground or is this an inside wall that keeps the bin separated?
My house has a sloped lot, bin is seperate room, block wall seperating it from boiler room [both are under 1st floor garage slab]. the bin floor is same as basement floor level, top of chute is at 1st floor level on side of house.
> . Can I use a metal cover on the inside of my bin (plywood) to help the coal slide better without worrying about corrosion and if so what should I use? 2.
Imo, normal galvanized sheet should last a good long time, and would allow coal to flow much better than plywood. I might use treated plywood, esp if you use stone for a base for it. Moisture level in ground would effect life of both to a large degree, imo.
Fwiw, imo, slower is better. some say run the auger fast, and let it 'fluff" the coal, but imo, that would make for more grinding of the coal. My auger is slow, works for me. Fills a 5 gallon bucket in apx 1 minute.
Pic below showing layout during install. Chute bottom is about as high as the auger gear box. Bin is apx 8' x 8'. Much shovelling needed to get that 6.4 tons in there. With empty bin, about 2.5-3 tons is all that'll roll in. Then, you can shove about another ton or so in with a long shovel. Then I have to get in with the coal and shovel it back. Once it's in there, it's cake though.
The gear box isn't very heavy, i made brackets to mount it where the motor fit originally. The motor hangs on a hing affair on the wall and the motor's weight keeps tension on the belt. Tension can be adjusted via shorter or longer belt. Just keep your hair out of the belt!!
I haven't posted pics [will], but I made a cover for the hopper that has a 6" snout looking up. There is a short piece of 6" rubber flex hose from the hopper outlet to bin cover. Foam rubber gasket on hopper lid, and latches hold it tight. No dust at all. Unless your coal is damp, you WILL get dust of you let it free fall into the hopper from the auger outlet.
Link to coal bin pics thread COAL BIN Pics