The image above shows how to make a huge helical gear, and it was captured from this 
. It uses a rather large lathe. I could not find how much this gear actually weighs, but at almost 8 tons per cubic meter I am guessing it weighs at least 3 to 4 tons.
On of the Acrosstics pages the word teeth is also featured is the Covenant, which is a secret (not sacred) text that appeared on the Internet in the past. It claims some rather alarming things, but I feel that is more meant to incite fear, than to be an actual outcome of what the few have in store for the many...