Andrew Golabek

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About Andrew Golabek

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    Mountain biking, Chemistry

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  1. Andrew Golabek

    Burners 101

    That last nozzle reminds me of one used for flame emission spectroscopy
  2. Andrew Golabek

    Bronze sword casting

    I think you are underestimating the material, it is hard enough that it won’t roll that far back unless it was exceedingly thin
  3. Andrew Golabek

    Bronze sword casting

    I took a few passes along the blade, the total width of the hardened area is approx 5mm I think, past that point I don’t think there is much benefit as the hardness of the cutting edge is what makes the largest performance improvement
  4. Andrew Golabek

    Bronze sword casting

  5. Andrew Golabek

    Bronze sword casting

    Yeah, i measured the density of the bronze as I cast it, to help me get an idea of the amount to melt for the casting, it was approx 8.7g/cm3 which is quite higher than steel between 7.7-8g/cm cubed. Testing recently revealed I didn't harden the edges sufficiently as it rolled in one spot, so I made a better jig for hammering them, and now it is much better. I'll attach a picture once I take some
  6. Andrew Golabek

    Bronze knife casting

    So far, my foundry has survived in nearly the same shape as it was when i started aside from some discolouration due to some silly experiments. I've successfully cast about 10 items so far ranging from 1lb to 4lb melts of classic bronze. The highest verified temperature I've achieved was approx 1400c during some experiments with ceramic it survived perfectly intact, which isn't a large surprise given the max temp rating of 3200f. Now onto its downfalls. There is a lot of larger grit in this refractory, no doubt giving extra strength, but mixing, and casting it without too much water by hand can be difficult. I couldn't find instructions for it online in regards to curing or water content, so just went with what seemed appropriate, as you add water to it, at a certain point it will become much easier to mix, and if there is any vibration it will act liquid. I think that is the ideal amount. Any higher, and from what I was told by the foundry supply is that it may not come out as strong. It sets like cement in approx 24 hours. The surface finish can vary depending on how well it was done from glassy smooth to very gritty with air bubbles on the surface. Firing it can be done relatively quickly once it has been dried with a low flame.
  7. Andrew Golabek

    Bronze sword casting

    It seems that lead was deliberately added in the past to help the castings flow better into narrow sections. tin had to be mined separately and it was alloyed to make the classic bronze
  8. Andrew Golabek

    Bronze sword casting

    Search up Neil Burridge, I believe he does the closest work to ancient methods, for European bronze replicas. Swords are cast, cleaned up, annealed, edges are cold forged, and the spine is hardened by hammering, and some bending. One problem with many of the ancient bronze alloys is the lead that was commonly added makes it hot-short.
  9. Andrew Golabek

    Bronze sword casting

    We have some proper cameras and equipment at home, these pictures were simply casual ones.
  10. Andrew Golabek

    Bronze sword casting

    Not home right now but I did take a picture with a less distracting background before; when I get home I’ll take some proper pictures.
  11. Andrew Golabek

    Bronze sword casting

    Nearly done, only final polish for the handle and oiling is left. brought it to the forest to test chop some bushes and stuff, works pretty well, I’m going to make a video in a little while showing what it can do. -the weight is 1.23kg or 2.71 lbs -the point of balance is 5.25 inches from the guard now or 13.3cm. -maximum width of the blade is 43mm.
  12. Andrew Golabek

    Bronze sword casting

    The blade has been final work hardened, ground, and polished. The handle has been rough shaped, almost ready for final shaping and sanding, then oiling
  13. Andrew Golabek

    Bronze sword casting

    Done most of the grinding, putting the handle on now, also work hardened the edges and annealed it prior to work hardening
  14. Andrew Golabek

    Forges 101

    It looks to me like the burner is running way too rich, (even outside the forge) and the mounting tube is too long, preventing adequate airflow to the burner, increasing the problem when mounted in the forge Also be sure to rigidize the ceramic blanket if not done already
  15. Andrew Golabek

    Bronze sword casting

    I suppose for this casting it served as double duty, as both sprue and gate at the end of it i don’t have any methods currently to turn it into other parts so it will probably just be used in the next melt