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JeffEvarts

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  1. Youtube is repleat with fake-science videos, but these do not seem to be those. I have seen a couple "primitive technology" channels on youtube who have done other credible fire-technology work claim to reduce iron using very simple hand-spun centrifugal fan blowers made from sticks and mud. Here are two examples: https://www.youtube.com/watch?v=c2ExwOAjLNw https://www.youtube.com/watch?v=3NgtZigQsBo Both, if you click on their channels, appear to have made iron, but I'm having trouble believing it. I have smelted copper in a bowl forge (MUCH easier) using hand-pumped bag bellows, and that was certainly hard enough for the 1.5hr time required to get the temperature up and allow the metal to cohere. I've also smelted iron twice: once with 4 people operating 4 sets of double hand bellows, and once with an electric blower, both took substantial fractions of a day. I just can't imagine that these guys are getting enough air through these dinky little stack furnaces using spinning sticks to actually reduce iron in the (apparently) much-less-than-a-whole-day time frame. Main Question: Anyone have practical experience trying to do human-powered forced air iron smelting? (regardless of the non-powered tools) Second Q: Anyone done it like these guys? -Jeff Evarts
  2. JeffEvarts

    Bronze hardness/tooling (Wrong forum?)

    Awesome. New ground to cover. BTW: It looks like 1500bc.com is dead. None of those links have resolved for a week or more. Thank you, Jeroen. Cheers, -Jeff
  3. JeffEvarts

    Bronze hardness/tooling (Wrong forum?)

    Ahh, the voice of knowledge. Thank you Alan. And since nobody "bit" on the silver tool angle, I'm going to assume that's impractical as well. How did they drill a (deeper 1:5 or 1:10) hole in bronze, then? Or did they just 'not do that'? More in hope than expectation, does this mean that I could (practically) scrape a flat or cylinder using a bronze-on-bronze (perhaps hammered-hard on heated/annealed) system? Labor time is not a problem in this case. Thanks for the replies everyone, this has been a good conversation. -Jeff
  4. JeffEvarts

    Bronze hardness/tooling (Wrong forum?)

    Jerrod and Alan: Thank you for replying as well. I am going to be combining (and casting) the metals myself, or at least that's the plan for now. Buying ASTM stock isn't off the menu entirely, but it's not what I had in mind. Other alloys are possible provided they were available before iron hit the scene. (Cu,Sn,As,Ag,Au,Pb) Wikipedia (and other sources) say that bronze is harder than cast iron (VH 60–258) and 30/70 Cu/Ag goes to 90. Perhaps a silver alloy tool? -Jeff Evarts
  5. JeffEvarts

    Bronze hardness/tooling (Wrong forum?)

    Jeroen, THANK YOU for replying! I had hoped to make a scraper for making (cast) surfaces flatter or rounder. Making a cylinder more round or a flat-dyed surface more flat. A bronze-on-bronze version of this ferrous-on-ferrous example. Do you think such a tool could be made? I am happy to use different formulations of bronze in the worked surfaces and the tool. If it's even remotely possible, I'm willing to give it a try. It seems intuitive that they must have worked bronze artifacts with SOMETHING before they had iron tools. Perhaps they used stone or meteoric iron? -Jeff Evarts
  6. Hello. I'm interested in historical metallurgy, and I have a question about differing types of bronzes, specifically copper/tin and copper/arsenic. I cannot seem to find any information about producing harder flavors of bronze (preferably without resorting to zinc/brass). Anyone know specific copper/tin or copper/arsenic alloys that could be used to make tools to work cast bronze (90/10 or 88/12)? -Jeff
  7. Jan wrote Smithcraft ftw! I hoped there might be a "technique" solution to this sort of problem. Maybe I should have titled my post "Missing skill" Certainly appropos for me. Excellent point! Thank you kindly, Jan! -Jeff Evarts
  8. I've drawn platinum wire through a jewler's drawplate rig, but that just consisted of hammering a point onto thick wire, then feeding it through a pre-existing drawplate, repeat ad tiny-um. It already had a very nice graduated steel drawplate, and I was wondering how the first ones got made. I am (as of now) completely unable to make any of these things, so I'm not speaking from a position of any knowledge whatsoever. I'm just wondering what steps would be involved in creating significant lengths of metallic (conductive) wire in the preindustrial era. I guess that counts as an intellectual challenge. -Jeff
  9. Alan, Dan, and Jeppe, Thanks for the replies! I'm not so concerned about when the drawplate arrived compared to how it was first made (well). Consider the following challenge: You're given a few kilos of wrought iron, a forge, anvil, hammers and tongs, and 100g (3 t oz) of silver (or if you're rich, gold) and asked to produce the thinnest 10 meter long round wire you can. What would you do? Jeppe: That link took me to an abstract, not the project. Is there another link? -Jeff
  10. Hello hammerfolk! I considered posting this to the tools forum, but that forum seemed to have a lot of high-tech answers, and this one less so. I am wondering what it takes to make a wire drawplate using hammer/tong/anvil tooling and wrought iron material. To me it's obvious how to do it if you have an augur with HSS/carbide tip, but wire drawing (for gold and silver, and I presume copper) went down to hair-like fineness in the Egyptian days. How would you make such a tiny hole in a hard material without sharp edges, burrs, or irregularities? If I was asked to design a process for anything down to 1/8 inch, or even 1/16, I think I could do it with just poking narrow hard pointy things through hot iron, then massaging them with a BP hammer... but litz wire goes down to 0.03mm, and I have no idea how to get there with "normal" tools and materials. Reminder: This is for the process for making the drawplate, not the process of drawing the wire. If anyone has a pointer to a process description, I'd be grateful. If anyone wants to make a Youtube video showing how to do it, I'd be thrilled. Thank you kindly, -Jeff Evarts P.S. There's some evidence (if you're generous) that gemstones may have been used as drawplates, but the question "how did they make a fine, smooth conical hole in a hard material" remains.
  11. JeffEvarts

    First Time into this fray

    I look forward to hearing about this. Has it happened? -Jeff
  12. JeffEvarts

    First smelt failure post-mortem analysis

    Great recap, and nice graph. Thanks for taking the time to get us this data! Don't doubt that everyone's taking notes. -Jeff
  13. JeffEvarts

    First smelt failure post-mortem analysis

    Depranon, I'm curious to find out how this worked out. Your pictures of the iron ore are great, and I'm curious to learn more about how it went for you. -Jeff Evarts
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