Andrew Golabek

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About Andrew Golabek

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    Mountain biking, Chemistry

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  1. Bronze sword casting

    We have some proper cameras and equipment at home, these pictures were simply casual ones.
  2. 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.
  3. 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.
  4. 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
  5. 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
  6. 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
  7. 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
  8. Bronze sword casting

    Did some grinding today; break down of the casting -sprue weighed 523g -tip thing I made weighed 36g -sword weighed approx 1250g once cleaned off as of this picture it weighs 1151g (2.53lbs) balance point is about 5.75 inches forward of the guard going to lighten it up at the front some more, handle is planned to be made of bubinga wood
  9. Bronze sword casting

    It will be work hardened, and I’m still not sure if it will be annealed or not before, it is quite stiff already, and some pieces I cast beforehand were slightly brittle, although perhaps brittle is an exaggeration as they were beat on with a sledgehammer haha the bronze knives I’ve made so far we’re cast, and then the edges were work hardened, no annealing was done at all.
  10. Bronze sword casting

    The mold is made from greensand, in an oak flask I made, with the particle board faces so the sand doesn’t crack outwards. Greensand mix was 75grit silica, 10% western bentonite, I’m guessing it was about 70-80lbs to fill the flask!! The foundry is propane fired, I used a graphite crucible, and the only flux was charcoal, both powdered and in chunk form (charcoal was made in the foundry prior in a heavily reducing atmosphere) i used a wooden pattern that I ground out on a bench belt grinder. this is my sixth bronze blade, although it’s about 4 times larger than anything I’ve cast before haha, I’m planning on grinding it smooth, and then annealing the spine with the propane torch (undecided whether or not to anneal yet), and then I have a little jig I use to harden the edges whether or not it will kill remains to be seen haha, definitely planning on testing it once it’s done, perhaps a chicken is on the order
  11. Today I successfully cast a bronze sword, this was my second attempt. 1.86kg of 12%tin bronze was used in the casting Not a perfect finish, but I’m pretty happy! will update as it is finished
  12. Ceramic Nozzles V2.0

    Awesome, pretty happy with my first propane burner :), tested today melting 2kg of copper alloyed to be classic bronze, worked perfectly well, although my mould making wasnt up to par haha Yeah mikey I think thats probably what happened with the previous gasoline burner, when the fuel wasnt flowing through, the inside oxidized, leading to problems with sufficient fuel flow, So I decided to make this propane burner.
  13. Ceramic Nozzles V2.0

    its got a choke, so adjusting it from here should be easy :), the actual internal diameter of the tube is approx 0.04 inches, maybe a little smaller, was hard to tell using the calipers. 8 inch 3/4 pipe for mixing, and i think 2 or 2.5 inch reducer coupling
  14. Ceramic Nozzles V2.0

    Running at a lower propane pressure in this picture but I think I got it running just slightly lean now, opened up the choke and filled the intake a bit. Should have a full range from oxidizing to reducing atmosphere now for casting what do you think of the nozzles which have A swell and then close narrower at the exit? I’ve seen them advertised for industry burners, not sure how it would work on one of these though sidenote, instead of a mug tip I used a 1/8th steel capillary tubing, cutting it short left a nearly perfect sized outlet for the propane (just slightly oversized)
  15. Ceramic Nozzles V2.0

    It’s my own design, I think the burner tube is a little on the long side, but I’ll try to open the entrance first, thanks