hi I'm Cressel Anderson this is Makercise in this episode I'll be making
crucible tongs and alloying bronze from scratch
Special thanks to Metal Supermarkets for sponsoring this episode of Makercise
I have a number 8 crucible that I have fired before in the kiln and now I'm going to load it up with copper
while that's coming up to temperature I am going to fabricate using a spare one
that I have I'm going to fabricate a set of tongs and a pouring shank for this crucible
for the two handles I'll drill a hole and then secure them together using a
steel pop rivet and I think it's important to use steel versus aluminum
for this application
after I had the tongs adjusted to pretty much where I wanted them I used a
microwave transformer just to kind of test them out with some weight in the
crucible
hey buddy
Hey pal how are you
Did you buyed a new tool?
I built a new tool
No I'm talking about--did you buyed THAT?
I BUILT this
Well I did it! I came in just in time currently the kiln is at 1977 degrees
Fahrenheit and that is right below the melting point of copper something like
1984 ish I quickly fabbed up--well quickly...several hours--I fabbed up a set
of tongs to pick up the crucible from inside the kiln and then I also fabbed
up a still little hot from the weld also fabbed up a pouring shank with the
little retention hook and this should allow me to pour from the side which is
a much better posture for pouring so I'll get the welder dragged back in drag
out my my sand base and get ready to pour some copper ingots pretty exciting
it took slightly over four hours for the kiln to get up to the melting point of
copper and for me to fabricate the tongs and shank it took another 45 minutes
after that for the kiln to power through the latent heat of fusion and get the
copper up to a pouring temperature of 2070 degrees
I'm going in okay?
these are the first few copper ingots that I made along with some of the
materials I'll use for a lowing bronze this video is sponsored by metal
supermarkets they're the convenience stores for metal and they source hot and
cold rolled steel aluminum stainless and more from over 80 locations across North America
For Makercise projects like these crucible tongs or the lathe cart
metal supermarkets is a great place to get materials because they focus on
small quantities support companies that support Makercise use the link below to
request a quote today for your next project
the voltage on system
probably because it's getting to be summer. Is lower it's not 120 volts 116 volt that means
my kiln is kind of flatlined it's not getting any hotter it's at about 1960
~1980 degrees I think there's molten copper in there
but it doesn't look like it's going to get any hotter so I'm going to try
putting it down in my little portable foundry and see how that works
all right so I alloyed up some lead tin and zinc
in proportions that should give me alloy 932 bronze so these are the amounts that
I use for lead, tin, and zinc and then I made some copper ingot as well as some
little copper drippings into a water bucket so that way I can you know get
kind of a precise amount we'll find out how accurate this comes out now I need
to figure out how much copper I need so this is 150 grams and that should be 17%
of whatever this ingot comes to so I take 150 divided by 0.17 (17%)
that gives me 882 grams for this ingot which means when I multiply that times
the remaining 83% I get seven hundred and thirty two grams so 732 grams of copper
132
I'll go ahead and add in all the copper but I'm going to save the tin-zinc-lead
ingot for after all the copper is molten and drop it in there right before I pour
So this would imply we're not ready at all?
No, this would imply we're very close to being ready
That is known as zinc vapor. Try not to breathe that!
Thats really hot.
What's that?
That looks REALLY hot.
It is REALLY hot.
Look at that junk.
Is that normal???
Yeh...???
Count?
this is the bronze ingot that I cast it's kind of got a cool color but it
also looks a little bit stratified kind of like rock where you've got different
layers so I'm hoping that's not where the zinc the lead or the tin has kind of
caused different layering but I guess we'll take a look here do some
scratching and filing and see we'll see what it looks like here inside I've got
this assortment of various grits from about 400 up to 3,000 this is wet/dry
sandpaper silicon carbide I got it off Amazon I'll
have a link down in the description but I'm going to try to take this surface up
to a pretty good polish and see how how thorough the alloying how consistently
it looks throughout this ingot
I should have checked to see what my yield was before I polished up that
corner but I'm pretty sure it was close to 850 when I weighed it pretty close to
850 so it should be slightly less than that obviously the material that I took
out in the saw kerf should improve the yield you know so I think there's about
8 grams missing from that saw kerf but let's call it 850 850 out of our 882
grams going into it field of 96 percent during the alloying with the tin zinc
lead ingots and the copper so the next step is for us to check out how closely
I got to my target of 932 bronze this analysis is from an x-ray fluorescence
analyzer I thought it was really neat that the analyzer identified the ingot
as C932 bronze these are portable handheld devices that can tell you the
elemental composition of items such as ingots it's really cool technology but
it's also really pricey thanks to everybody who's supporting me on patreon
I really appreciate it and I hope this video builds your confidence to exercise
your inner maker thanks for watching
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