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  • Fitzroy Storm Glass (18th Century Weather Prediction Device)

    Potassium nitrate and ammonium chloride are readily available at garden stores. The former is used as a slow acting stump remover - it accelerates decomposition of dead wood. Spectracide Stump Remover can be found at Home Depot and similar stores. It is just KNO3 granules. Ammonium chloride is a common fertilizer. Also easy to find online or at better gardening stores. Camphor can usually be found at a drug store.Fun historical chemistry project.

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  • kpau commented on MakrToolbox's instructable Zen Garden CNC End Table8 months ago
    Zen Garden CNC End Table

    Fantastic concept and execution. I really want to make one, and doing so is completely within my capabilities (finding the time on the other hand...). I have only two suggested improvements:1) Use a piece of tempered glass for the top. Really, it is a lot safer. Drop the wrong thing on that plate glass top and you have a dangerous mess. They can be ordered to dimension at any glass shop. Just get the measurement right, they can't be cut once tempered.2) Add a wifi module and create a little joystick app for your tablet or smart phone, so you can draw from your chair. Or push programmed patterns wirelessly to the arduino from your computer. Or just screw with guests by surreptitiously writing their name in the sand from the other room (paranormal activity!). I've done several ar...

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    Fantastic concept and execution. I really want to make one, and doing so is completely within my capabilities (finding the time on the other hand...). I have only two suggested improvements:1) Use a piece of tempered glass for the top. Really, it is a lot safer. Drop the wrong thing on that plate glass top and you have a dangerous mess. They can be ordered to dimension at any glass shop. Just get the measurement right, they can't be cut once tempered.2) Add a wifi module and create a little joystick app for your tablet or smart phone, so you can draw from your chair. Or push programmed patterns wirelessly to the arduino from your computer. Or just screw with guests by surreptitiously writing their name in the sand from the other room (paranormal activity!). I've done several arduino wifi projects, and it isn't too difficult. You can get an arduino wifi shield, but I prefer using a $15 mini wifi router with USB and hanging the arduino off that. These days the easiest might be to replace arduino control with a Raspberry Pi (even a cheap model A+ would be fine) and a wifi dongle. Then you can code everything in Python and even pull up a headless GUI on your computer or android device to operate/modify. You'd never have to open the thing up to tweak the programming or add features.I'm putting this near the top of my 2017 project list!

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  • DIY aluminum investment casting using a 3d printer.

    Great post. I plan to try this soon. There are now some very inexpensive (<$20) graphite crucibles available on Amazon. I'm cheap too, but time is also limited. I think I will try that route.

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