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I Forge Iron

gwynlaredogranger

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About gwynlaredogranger

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    maine
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    curiosity, intelligence, craftsmanship

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  1. perhaps you are conflating investment casting with (cope and drag) sand casting
  2. i wrote some huge thing but really, you arent going to have much luck getting a foundry to sell you a mold. the molds that we make in foundries are for us to use, the customer usually just wants teh metal casting that comes out of it. ask your BF what other things he may need aside from molds ( he most likely will want to make his own molds as that is part of the 'fun' of foundry) and try to get him something that he can use over and over...best of luck!
  3. The cool thing about jewelry casting is that most if not all waxes are solid and not large. Not to say that jewelers haven’t cast big pieces , but not usually. I dig the set up for your burn out schedule , I’m sure you have that dialed in. When I started casting I first learned large investments . These would be 2-5 ft tall range moulds made from ludo, pottery plaster, #200 mesh silica flour. After setting up we would load a hand built soft brick kiln around them and face it with hard brick, rig up a burner and camp out for a three day burn. Taking them out of course was also surgical because
  4. Most wax patterns need to be hollow. Also the runners and gates are hollow core. Nobody can make a statement about casting that applies to all castings. Most foundries that are burning more than 150 pounds of wax at a time need to use an autoclave . That I’m no way means that you should always use an autoclave. Plus most people aren’t going to have a device like that. The best way to burnout shells is the right way for each shell/pattern. If you’re casting the same part over and over and over you tailor the burn to that . If you’re burning a large solid piece , then you need an entirely differ
  5. yeah i wouldnt do any of that steam stuff ,especially without an autoclave, and even that is usually in large process ceramic shell facilities where youre dewaxing 150 lbs or more of wax. most foundries stopped doing that since the breakage is much higher with uncured shells or green investment mixture. jewelers usually use a small fired kiln. if your investment mixture is silica flour and plaster it stands a better chance, but still the steam breaks down ceramic shell before it's cured (it gets vitreous at 1000º). you want a fast hot kiln that can get to 1000º in under ten minutes if possible
  6. im sure youre right about graphite needles,also has terrible shear value, but do you mean ledeburite? i know that doping the iron with Si moves those graphite needles around a bit. ive seen this in castings in areas that cool slower than the rest of the casting due to thickness.
  7. investment casting, cool, i have a shell department. they sell that stuff that doesnt need to be in a slurry tank nowadays. how will you be dewaxing? i have burnout oven that i can reclaim my waxes with. Aluminum bronze is tough to weld and super hard, harder than some steels even. great for wear plates. i have large opinions about dewaxing, it can get sketchy. plus the shell needs to be cured a certain way...aw man so much to cover! yeah the peeping is great out here too, ive come to feel fine wearing tons of safety gear all day in the heat, that way when you take it off ,it actually gets coo
  8. gadget- copper is a challenge to melt, requires a decent temp of around 2000º f -2100º . that gets it hot enough to flow but not too hot as to cause porosity and other defects. its a lot trickier to melt than bronzes that is for sure, but you will love the way it pours out, it will fill in a similar way to aluminum, but its heavier and has better head pressure when poured. be sure to not disturb the melt surface and to skim all slag thoroughly. it is MUCH hotter than aluminum when you are pouring so you wont even be able to stand near the crucible without trousers on. i prefer pouring Al
  9. Daniel interesting that sweet spot of fast enough but slow enough is a difficult one to nail down for sure. is this anything like spherical graphite iron? do you use a % of silicon in this alloy? outside of the dendritic patterns ,what are the forging characteristics of the alloy youre making ? im asking because i dont know too much about the families of iron/steel outside of ccasting them. i only have to deal with the alloy,its flow ,shrinkage, porosity and ductility. i dont know enough about forging to know if this alloy is better or worse in its physical working properties, i do get th
  10. do have a sense of how long your nucleation cycle actually is? its a shame about that porosity in the previous attempt, its definietly a result of long nucleation, and also the thickness, i wonder if the shape can be changed to avoid thicker castings? im sure you know a lot more about that, but from a metallurgical standpoint that short cycle crystallization is key in making a void free casting. very cool thread and interesting results. i love the glass as parting agent trick too!
  11. are you saying that i'm completely wrong in my suggestions? or are you saying that if something seems to make sense, that it doesnt actually make sense? or are you saying that because you dont like me that youre trying to find something to disagree with me about? or are you totally discounting my experiences of the past because i have osha certification ? im not sure i follow what youre posting about, can you clarify? also id like to get back on topic since the person who posted this thread is looking for good input on their set up and melts, not listening to two old guys yammer back and forth
  12. i have a 30 hour osha card and a lot of the stuff i had to learn made very good sense. even if it seemed over the top ,its better to assume the worst than to not. i guess what i meant by my statement wasnt that silica fibers werent important, but the immediate threat to me was the lack of awareness of surroundings, and of the proper PPE and also piping safety. that was all i meant, im very sorry i didnt say that well, and in no way was i downplaying the threat of silicosis or of silica fibers. its my biggest fear persoanlly, since i work around silica in at least five forms daily. from fumed s
  13. Glenn-i always err on the side of caution. i run every deice in the shop with one way valves, my glory holes have triple lockout safety sytems with relays, fluid power gas actuators etc. if im using a janky set up in a backyard then why woudlnt i take every conceivable precaution? if im in a residential neighborhood ten feet form a wooden scrap pile why wouldnt i take that extra step to ensure that the tank can never blowback? im sure its not necessary ,it may be ' just an opinion' (isnt everything these days? are facts dead?)but its always better to overdo safety than to under estimate waht '
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