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  • Cheap Scalable Arduino CNC (Plotter, Mill, 3D Printer...)

    Machine tools used to be hand operated. Then, motors and electronics were added that allowed them to be controlled by numbers punched into paper tape.This gave us Numerically Controlled tools.Later, the tape machines and then the electronics were replaced by more sophisticated computers and we got Computer Numerical Control.CNCThis may seem like ancient history but I replaced tape readers on NC machine tools in the 1980s and 1990s! ;-)

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  • Tardisrepairman followed mendelecha11 week ago
      • Cheap Scalable Arduino CNC (Plotter, Mill, 3D Printer...)
  • Tardisrepairman commented on halledean's instructable Leather Underbust Harness1 year ago
    Leather Underbust Harness

    I'm very impressed by the way you decided what you wanted and then went right out there and made it.Great work! Terrific final product! Well Done! :-)(After reading all the safety advice in the comments I have cut off all my hair and thrown away my gloves and scarfs on the off-chance that I ever use a belt sander. ;-)

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  • Simple and Durable Hydroxy Gas Generator

    Hi!Thanks for this instructable, You have made a very nice box and the parts inside are well put together and clearly achieved your goal.I am surprised by the amount of argument about the name and structure of the gas prioduced.I think the main point is that the gas produced is explosive.This is not the same as simply flamable.Propane and butane are flamable gases that can be stored and shipped safely by preventing them coming into contact with oxygen until they are to be burned.Hydrogen is the same.If the hydrogen was collected seperately and stored is a container without any other gas (Say, by filling it with water and inverting it is a container of water and bubbling the hydrogen in , thus displacing the water in the container.) the hydrogen would be relativly safe. It only burns whe...

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    Hi!Thanks for this instructable, You have made a very nice box and the parts inside are well put together and clearly achieved your goal.I am surprised by the amount of argument about the name and structure of the gas prioduced.I think the main point is that the gas produced is explosive.This is not the same as simply flamable.Propane and butane are flamable gases that can be stored and shipped safely by preventing them coming into contact with oxygen until they are to be burned.Hydrogen is the same.If the hydrogen was collected seperately and stored is a container without any other gas (Say, by filling it with water and inverting it is a container of water and bubbling the hydrogen in , thus displacing the water in the container.) the hydrogen would be relativly safe. It only burns when in contact with oxygen.This generator produces a mixture of Hydrogen and oxygen in the same volume of space.(Whatever name you give this , we are all agreed that the elements are present and in the correct proportions to combust. :-) )I know from personal experience that even 2 liters of this mixture in a soda bottle can cause a powerful expolosion.The flame arrestor mentioned in the comments is a fine metal mesh that stops combustion from travelling from the torch into the tubing and generator by cooling the burning gas belowcombustion point. If this fails or is not present , there is a real danger that the tubing and genertator could explode.As with many Instructables, the information contained in yours is valuable and should be treated cautiously. :-)

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