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22CommentsJoined September 5th, 2015

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  • Make a carbon arc torch for your 220 volt stick welder

    In my youth I used to operate one them carbon arc projectors in a local cinema. It was wonderful watching the carbon rods burn away. You had to watch thru a special sort of welding glass and a small regulated motor (in series with a variable resistance for precise tweaking) kept the carbon rods just at the right distance apart. Sometimes something happened and off they went. Then the whole audience would start screaming their heads off esp at a suspense scene!! My instructor used to remind me to check the length of the rods before starting as once the show is on nothing can be done esp if they didn't last the whole reel.I really miss those days when everything had to be done manually.

    We used 1/4 inch carbon rods filled with a special composition to give more intense light. If I remember correctly power was about 60v at 90 amps or so which can be raised (for more light) but then they would consume quicker.

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  • JoeG17 commented on made2hack's instructable How to - Make a $25 Oscilloscope9 months ago
    How to - Make a $25 Oscilloscope

    How do you use the built in sine wave signal?

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  • JoeG17 commented on tutdude98's instructable How to revive old lead acid batteries9 months ago
    How to revive old lead acid batteries

    Before you make up your mind to clk on this see that you have a ton of patience on your hand!

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  • Bring Dead Lead Acid Battery To Live Again

    Wasted a lot of my precious time reading repeats and repeats all over again. And cannot even fast forward to see what it was all about. Annoying to say the least. Result (guessed I hadn't the nerve to continue) was to buy something. It seems the thousands of dollars from selling recon batteries weren't enough!!!!!

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  • JoeG17 commented on Paige Russell's instructable 10 Unusual Uses for Pencils10 months ago
    10 Unusual Uses for Pencils

    No body mentioned that pencils come in a whole range of black 3H 2H H HB 2B 3B etc. The H's are hard and grayish whilst the B's give a dense black as the number increases. The high B's are smooth to work with. In art quite a lot these are used for different effects.

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  • JoeG17 commented on robives's instructable 3D Printed Geneva Drive10 months ago
    3D Printed Geneva Drive

    It was also called the Maltese cross mechanism.

    This was the heart of 35mm cinema projectors back in the goo ol' days. I dunno whether they are still in use today.It was used to give an intermittent motion to the film thru' the continuous motion of the motor.

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  • JoeG17 commented on chrisnotap's instructable Diy Simple Soda Bottle Mousetrap10 months ago
    Diy Simple Soda Bottle Mousetrap

    Me veggie

    Presume they turned into pottery then.

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  • JoeG17 commented on chrisnotap's instructable Diy Simple Soda Bottle Mousetrap10 months ago
    Diy Simple Soda Bottle Mousetrap

    a tiny micro switch which starts a firework display when he is in!

    Me too!!!!

    Everyone wants to live.

    Everyone needs to eat. Don't you?

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