This just illustrates more issues with the bottom tread-feeding from a stack. I think I could probably get it to work, but I'm thinking of trying something different: using a bar or something to push one disk off the stack, either from the bottom or from the top. If it's from the top, then I have to keep moving the stack up; I don't really want to do that as I'll have to use more motors for that. However, I think it would be fairly easy to do: one motor...
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I got an idea for a custom-purpose robot. Basically, the idea is to make something which is able to take a DVD off a stack of DVDs and put it in a DVD tray. Then, the computer rips the DVD to a movie file. Once the rip is done, the DVD tray opens up. The robot should then take the DVD out of the tray and move it onto a “ripped” stack, pick up a new DVD, and repeat the process.

This is going to be an interesting problem. There are several different components of this which need to work...
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