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How I made my drawing machine, and in the process made artists obsolete. When I first moved into my new studio, I had no important projects looming, and wasn't yet comfortable in the space. I built this "Drawing Machine" so that I could be productive, but not really. I would set it up, turn it on and then read Sculpture Magazine for a while as the machine did its jiggly business. This project was built using junk found around the studio for a cost of $0.00. It utilizes an old power drill with an offset cam in the chuck for motion.
Step 1The Machine
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Essentially, it's a power drill with an offset cam in the chuck clamped to a box. The cams were made using a hole saw on 1/8 inch copper sheet, with a thick copper stem hard soldered off center. A good deal of flexibility is available in this detail, as a lot of cam configurations can be used. The pics make it pretty clear how the rest of the thing is made. It's not rocket science, it's art.
The only problem I have found with this project is that with out the correct blend of elements, the drawings might come out looking very muddy. Not that there is anything wrong with muddy. I, however, lean heavily towards the minimalists and the abstract expressionists. Not so much the color-field types. But that is an issue of personal taste.
Screaminscott mentioned a bit about putting a raised design underneath which I liked. It is not really noticeable in the photo of the drawing (let's call it) "diagonal marks", but the texture if the wood underneath does show, so that idea yields positive results.
Kiteman, I'm not sure your ball-bearing idea would work so well, as the motion of the machine isn't so violent that a copper sheet would be marred. I could be wrong, and I would love to see images of you proving me wrong.
Mamofo: http://animalsart.ru/chimpanzee1.htm Yes, they can.