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  • esotericeric commented on charlesglorioso's instructable StreetWriter3 months ago
    StreetWriter

    Hi, Charles - I live in Oregon, USA. I've been interested in "Drawing Machines" for years, and have built a couple, including a Polargraph http://www.polargraph.co.uk/. I had making portraits more in mind than something more abstract, but I realize that keeping everything in correct registration as the device unwinds from the pole will probably be a big problem, although if the truck goes at a very constant speed I think this could be overcome, as the radial position should be pretty accurate. Also, maybe by using stepper motors the instantaneous location could be accurately determined, assuming zero wheel slippage - would have to drive maybe only one inner or outer wheel, as otherwise there's bound to be some slippage when driving a spiral course.. Failing that, it's possibl...

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    Hi, Charles - I live in Oregon, USA. I've been interested in "Drawing Machines" for years, and have built a couple, including a Polargraph http://www.polargraph.co.uk/. I had making portraits more in mind than something more abstract, but I realize that keeping everything in correct registration as the device unwinds from the pole will probably be a big problem, although if the truck goes at a very constant speed I think this could be overcome, as the radial position should be pretty accurate. Also, maybe by using stepper motors the instantaneous location could be accurately determined, assuming zero wheel slippage - would have to drive maybe only one inner or outer wheel, as otherwise there's bound to be some slippage when driving a spiral course.. Failing that, it's possible that an onboard GPS could sense the current orientation and be used to vary the stepper motor steps to keep it "in phase" with the previously printed pixels, although that would be pretty complicated, and I'm not sure whether GPS's are that accurate as far as North- South orientation is concernedAs an ex-Boeing engineer, I think I'm pretty good on the design and mechanical end of things, but at age 76 my Arduino programming skills are definitely lacking.If we could come up with a "SpiralDrawer" I think it would be a great MakerFaire-type attraction .I haven't thought about it too much yet, but maybe with further thought, some of the difficulties will go away - and others appear :-)Eric

    I think this is an awesome project, and am thinking of building a modified version in which the "cart" is tethered to a central pole, and as it goes forward it unwinds from the pole, thus travelling in a spiral. I would then like it to create pictures (with water) from high contrast photos which are uploaded to the SD card. I can see that I will have problems converting the photos from cartesian coordinates to spiral coordinates, and then programming the Arduino to perform the necessary calculations. If anyone who could maybe help with the math and programming and would be interested in collaborating on such a device could get in touch with me that would be great !

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  • How to 3D Print a Photo: Lithophanes 101

    I think you left out the most important thing, which is what filament to use. I've had good results with transparent PETG.

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  • DIY Self-Balancing One Wheel Vehicle

    Are you controlling it with the "leash", or is that just to stop it running away when you get off ?

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  • 3W 4'x4' Arduino Laser Cutter/Engraver

    Not being familiar with fritzing diagrams, I guess that I mistook what is the power in icon to be the laser, and I assumed that the diode icon was indeed an LED , whereas in fact I now realize that it's the laser . So now I have things straightened out (maybe)Sorry for being dumb :-)

    Did you ever sort out where the power supply is connected? Several people asked this question, but never got a reply , and I have the same question. Is everything - laser, Arduino, motors run from the same power supply?

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