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I Forge Iron

Sam Thompson

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Posts posted by Sam Thompson


  1. The welder will have to come next....I've had a Miller 225 v. CV/DC machine in my garage for about 2 years...I haven't been able to use it for lack of a bottle of shield gas and mig wire.

    With a working welder....constructing my own hardy tools, jigs and other gear will be much easier.


    If your shed is leaky or the environment is damp a stick welder will be a better bet. Mig wire rusts easily and will block the torch liner very quickly. Unless you plan on doing a lot of fabrication it's far easier to keep a box of rods in the house than it is to take the wire out of the machine every night.
    Remember that there are two types of overheads: fixed (those that you have to pay whether you work or not) and variable (the costs of actually doing the work). You need to divide the fixed weekly costs by the number of hours that you actually charge for (30 out of a 45hr week is good going) and add this to your labour rate, along with depreciation and profit (don't confuse profit with wages).

  2. In chemistry class, the professor was talking of "Hydrochloric Acid" and saying how powerful it was. At then end, I went to him and asked "Is it more powerful than Muratic Acid?"

    He replies: "Your father is a plumber."

    I was floored! Apparently only plumbers refer to hydrochloric by that term. Score for the professor!

    -Doug


    It's known as hydrochloric acid in the bits of the world that aren't America. We also call it 'Spirits of Salt' and use it in a fairly concentrated form to clean drains.

    If you dilute any acid, add the concentrate to the water otherwise the liquid can boil fiercely enough to leap out of the container.
  3. First file a spiral groove on a piece of steel, form a cutting edge and harden it. Use this tap to cut an internal thread, form cutting edges and harden it. This die can then be used to cut another, slightly more accurate tap. Repeat the process until the threads have evened out. Threads made by this technique were common and were unique to the shop where they were made, standardised threads were not available until the mid 19th century.

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