intermediate robot arms?

wrote:


One might also consider an electronic "touch" sensor to detect initial contact with the surface, then use additional incremental movements to increase the desired brush "squish" on the surface.
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On Jul 26, 6:03 pm, snipped-for-privacy@dodgit.com wrote:

Back when us CAD designers used pen plotters, it was common for other people in the company to stop at the plotter and watch it do its work. I always said I should charge admission.
Some earlier models of plotters had stationary pen holders... those may be more adaptable to your goals.
I know you want to do a brush, but I suspect that a sprayer(pehaps airbrush like) would be more dependable. There is an unpredictability when ever you handle something "soft"... anything material that doesn't behave exactly the same way each time.
An idea I've had in the past (but never really persued) would be to make a 3-D gantry-type milling machine. Have it carve a 3-d sclpture from foam, and then paint it using the spray head. This way it may be possible to re-create something like a vase with a painted pattern. The same tool path used to machine away the final layer of foam could drive the painter head... just tell the CAD program that the "tool" head is a little bit beyond the end of the spray head.
www.shopbottools.com is a good source for a relatively low-cost gantry mill. '4x'4x6" version is $7,500
One web site with a forum and lots of infor for a do-it-yourself gantry mill is http://www.cnczone.com/forums/index.php ?
Joe Dunfee
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Have you thought about maybe having a horizontal canvas and have the bot roll around on it while painting ? Then the wheels could be part of the art creation hardware. Spongey aircraft wheels; wide wheels; narrow wheels, etc.
Also, I thought that if you incorporated an infrared sensor into the brush / brush-holder, then you could have the bot make decisions based on the paint already laid down on the canvas, since different colors would reflect differently. For example, put some red paint next to a blue blob.
Just some thoughts on it ... JCD
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