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  • Already done. It's called a "lens". In other news I invented a device to make almost any object literally frictionless on a flat surface. ... what should I do with it?It's a rigid sheet with two horizontal cylinders under it placed side by side and you put the thing you want transported on top of the rigid sheet. I can't find anything online, and people keep telling me such a thing is impossible. So, um, yeah...

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  • daved8 commented on phrazelle's instructable Steampunk Raspberry Pi Laptop6 months ago
    Steampunk Raspberry Pi Laptop

    you could make some serious money selling this as a kit. serious.

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  • daved8 commented on bfoz's instructable Pressure Cooker Vacuum Chamber11 months ago
    Pressure Cooker Vacuum Chamber

    seems like you can do all this with a semi-spherical thick glass cake dome, a piece of mdf with a rubber sheet (seal), gauge, tubing, and valves, no? My wife has a thick glass cake dome ... seems like I can do it for under $20 with my vacuum pump and wife's cake dome.

    You're on the right track Glen, but you don't need anymore than one hole in the entire thing, top and pot combined. All you need to do is have the pot arranged so it's like a water hammer arrestor design. You put the pump in the same tubing as the meter and the valves, then have one pipe going into the middle of the top of the lid. That's the thing about pneumatics. The pressure is the same everywhere so you don't have to pull pressure "through" the vacuum chamber, just have the vacuum chamber connected to the assembly.

    seems like you can do all this with a semi-spherical glass cake dome, a piece of mdf with a rubber sheet (seal), gauge, tubing, and valves, no? My wife has a cake dome ... seems like I can do it for under $20 with my vacuum pump and wife's cake dome.

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  • daved8 commented on matstermind's instructable Chimera: $60 DLP High-Res 3D Printer1 year ago
    Chimera: $60 DLP High-Res 3D Printer

    Maybe reflecting UV off the build surface? Am thinking of making mine out of sheet metal (iron steel), deeply sanded with 50 grit in a criss-cross pattern, then given a black patina in motor oil (heated to smoke point on my grill).

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  • DIY CNC For 60$ (Large Work Area)

    Curious... what would the layman call this?

    Nice, using geometry to your advantage. I would think with drawer slides you're still going to get play, yes? Maybe plain old rollers on the deck at all 4 corners to get rid of that Put as many supports at the extents as possible, like z-axis (hold the tool / pen at a point as close to the end of the tool as possible).

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