Don't Build a Metal Foundry Until you See This First

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Updates, improvements, and all your questions answered about the Mini Metal Foundry. I had no idea so many of you would actually be building this!

Common materials in the Mini Metal Foundry

[✓] Clay Graphite Crucible:
[✓] Steel Pail:
[✓] Plaster of Paris:
[✓] 2.5 Quart Bucket:
[✓] 5 Quart Big Mouth Bucket:
[✓] Heat Resistant Gloves:
[✓] 1-3/8” Hole Saw:
[✓] 3” Hole Saw:
[✓] 1” x 12” Steel Pipe:

Endcard Links:

Stealth Shelf:
Melting Soda Cans:
Propane Torch:

See What Else I’m Up To:


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Music by: Bird Passengers – “Wanderer”


This video is only for entertainment purposes. If you rely on the information portrayed in this video, you assume the responsibility for the results. Have fun, but always think ahead, and remember that every project you try is at YOUR OWN RISK.

okay what's up guys today I'm out here with my mini metal foundry because we're celebrating a milestone the video on melting pop cans has reached over thirteen and a half million views and over one hundred thousand likes now when I first made the metal foundry I had no idea that so many of you would actually be making this yourselves and as a result a lot of you have had questions and concerns and left comments about failures and mistakes that have been made and I wanted to update you through this video about some of the personal tips and tricks that I started using that may solve those problems for you the mini metal foundry is made of some very basic materials it's just a steel bucket with a little bit of sand some plaster of Paris and some water to create just enough of an insulating layer that you can heat up and melt metals like aluminum brass and even silver and gold okay now some people would like to know why did I design the metal foundry out of sand and plaster when I could have used refractory cement chalo wool or other higher quality refractory materials like that and the answer is simple when I design the metal foundry I wanted it to be relatable I wanted most people to be able to go out and buy simple commonly available materials and put together a backyard foundry that would work now along with that using cheaper materials means that the system is gonna break down a little bit faster one of the most common pieces of feedback I've had from people is that after two or three firings the lid starts to crack and crumble and break and that's not just you guys that happens to me as well but I figured out a cool little trick you can do it'll make it last about ten times longer and all you need is a little bit of steel wool I went down to the hardware store and found some of the courses steel wool I could get and when you unravel the bundle you can see it rolls out into long strands of steel which is kind of like a metal spiderweb and the idea is to push this down into the plaster and sand mix while it's still wet because this metal mesh will help reinforce the sand in the plaster and hold everything together about ten times longer than it would without it if you want to get even more mileage out of your metal foundry than try using stainless steel strands instead of the steel wool you can get stainless steel strands in things like brillo pads which are gonna be a lot more expensive but it should hold up a lot longer in the same kind of conditions another one of the benefits of the metal foundry is it's very easy to make over time the walls will start crumbling but you can just bang all that crud out with a hammer and mix up a new batch and in 20 minutes you've got yourself a brand new system a bag of plaster and a bag of sand together will cost about $20 but the cool thing is you can make between two and three metal founders with it now some people wonder if you can use cement or concrete instead of plaster of Paris and I would strongly caution you not to you the reason is if there's any moisture trapped in the concrete then when it heats up there's the potential it could explode in your face on the other hand plaster of Paris and sand are very porous so they vent the gasses off and there's very very low risk of that happening at all now the foundry will reach temperatures up around 2,000 degrees Fahrenheit and I know that because of a melt copper and if it can melt copper it'll melt silver and gold as well but it probably won't melt steel steel has a melting point up around 2,300 to 2,400 degrees Fahrenheit so you might be able to use the metal foundry to help you forge steel but you're not gonna be able to melt it down and cast with it okay let's talk about crucibles now I used a fire extinguisher for my crucible and that was mainly just to show that it could be done in an apocalyptic situation I certainly wasn't recommending that a fire extinguisher was the best way to go but it's blowing my mind how many comments and questions I got from people asking where to get fire extinguishers for that they bought a fire extinguisher only to find out that it melted in the foundry let's address that issue first first of all if your fire extinguisher is melting in the foundry it's not made of steel remember a magnet will stick to steel but it won't stick to aluminum so if you want to know if your fire extinguisher is made of steel or aluminum touch a magnet on to the edge and see if it sticks I got my news from an industrial equipment supplier but that's not gonna be the typical story for you by far by far by far by far the best crucible I've ever used is called a clay graphite crucible and it's one that I found off the internet for about 30 to 40 dollars now it seems like a little bit of investment but trust me a fire extinguisher isn't gonna be any cheaper and the clay graphite crucible is gonna last a lot longer I personally put mine through over 30 different firings and it has taken a lot of abuse you see it's vitrified and almost like turned to glass on the edges but I put this thing through thermal shock I heat it up I cool it down i heat it up I cool it down I heat it up and cool it down again and it just keeps going and going I even cracked the side of it once but it seemed to just heal itself so a clay graphite crucible is probably what you want to go for and I'll put a link in the description to one I found on Amazon that I think would be a good recommendation for you now when it comes to making ingots I've made all kinds of different shapes sizes and styles but definitely by far my favorite are the mini metal muffins these ones are my very favorite because they're extremely easy to store they're very easy to melt and they'll almost fit any size crucible if you make some of the bigger muffins you're getting a much bigger crucible to melt them back down and it's gonna take a lot longer to do now let's talk about charcoal not all charcoals are created equal the charcoal I used for my first firings was the Kingsford Charcoal which is used for barbecuing there are ingredients in there like lime which is specifically designed to make the coals burn at a lower so they last longer so if you ever switch over to something like lump charcoal which is basically just pyrolized wood you're gonna find a massive difference in the way it operates the first thing I noticed about lump charcoal is it emits a shower of sparks so you definitely want to make sure you're wearing long sleeves you're gonna end up with little sparks burning your arms the other thing is is it burns a lot hotter in the early days I had one of my steel fire extinguisher crucibles in there and it actually got so hot that it melted the steel and all the aluminum leaked out so if you use lump charcoal it'll burn a lot hotter it's very very powerful stuff but you need to watch it more carefully use a lower setting on your hairdryer you don't need to be pumping that much air into it to get the same temperatures if you're still using charcoal to melt your metals and as soon as you turn the hairdryer off pull the tube out of the metal foundry if you leave the tube in the foundry with no air blowing the heats gonna travel up that too and melt your hairdryer and you're gonna end up having to get a new one now if you made the switch to the propane conversion congratulations I hope it's working well for you but there are some things that you should know like if you run the propane tank for more than about 25 minutes it's gonna start getting really really cold it may start to sound like the gas is running out but really what's happening is your propane cylinder is starting to freeze up a couple of ways you can battle that is to get a big bucket of warm water and just dump your propane tank down into it to help warm it back up again or just get a bigger propane tank they'll take longer to freeze now I want to talk for a second about styrofoam casting I did styrofoam casting in my previous tutorials because I think that's the simplest method to get started in casting but it doesn't always yield the cleanest results it's a trial and error sometimes it works sometimes it doesn't it blows me away that this concept even works at all that you can just bury styrofoam in sand poured molten metal and pull out a casting that looks almost identical but the surface is gonna be rough and sometimes the sand collapses and you lose your entire project another thing you need to consider when styrofoam casting is that styrofoam can Bend so when you're adding your model to a bucket of sand you need to be very careful about how you add the sand because putting too much pressure on it can bend the mold and then when you cast it it's gonna come out looking funny if you want to pull the most value in the most detail from your styrofoam castings as possible it does make a difference what kind of sand you use regular play sound will work great but if you want even more detail you can go to the pet store and get aquarium sand which is extremely extremely fine sand that'll just be able to get into all the nooks and crannies a lot better and help your casting come out looking really crisp I've worked with very very wet sand all the way to extremely dry sand and I haven't noticed much of a difference between them some people wonder how long should they let their foundry cure before they use it and honestly I don't really think it matters I use mine the same day I make it and it seems to work just fine one other disadvantage to styrofoam casting is the as you pour quite often sand will fall into that molten mix which will contaminate the purity of your metal so even if you try and buff it up sanding it and spend a lot of time your nose little specks of sand start to surface through and you'll never be able to get a perfectly smooth finish now if you really want to get serious about sand casting rather than using styrofoam which vaporizes every time you pour your metal look into green sand casting instead it's about 90% sand 5 to 10 percent clay and then just a little bit of moisture to get it to a consistency where it'll hold together like a sandcastle the cool thing about green sand casting is you only have to make your model once and then you can pack the sand down around it and then pull your model back out you can reuse your model and your sand over and over and over again now a lot of people ask me to try casting the foam fighter jets from a previous project but there is a problem and that's that the foam is not thick enough for the molten metal to get down inside I've noticed with dollar-store foam board your object needs to be about two to three layers thick in order to get the molten metal into all the crevices if it's less than 2 thick your chances are very very low that it's gonna fill all the gaps now let's talk about spalling at certain times of the year there's probably moisture held within the concrete and if you ever spill your molten metal on the concrete it can flash that moisture into steam in an instant and explode spalling out bits of concrete all over the place now in my experience these chunks of concrete fly up to about 5 feet away which doesn't sound like much but remember it's spewing molten metal at the same time so if you're working over concrete be very very careful that you don't spill any molten metal if you want to be extra cautious then do it in an area that's covered in sand when I was making the mini Master Sword I failed over and over and over again metal casting is an art form it takes a lot of practice you're not gonna get it right on the first try it's just a lot of fun to get in there get your hands dirty see what works and see what doesn't play around with the materials that you've got and see what you can create so there you have it guys I actually I'm still a really big fan of the mini metal foundry after two years of using it I still use that one personally and I haven't made another system because it gets the job done and it works so well and remember that this is an entry level system if you want to get really serious about backyard casting I'd strongly recommend looking into proper refractory materials you want to be getting a refractory cement or Kol it's expensive but it's really good stuff and it'll last a lot longer the purpose of this project was to get you thinking outside of the box and seeing that you could do things on your own and there are other ways to do it as well my friend Nighthawk and light just dug a hole in the ground and blew some air into it and that was enough to melt aluminum the backyard scientist just put out a tutorial for making one of the simplest propane burners I've ever seen also check out the art of weapons this is a kid who took refractory brick and made his own electric kiln for melting metals as well which is very clean and uses electricity instead of propane or charcoal so there you have it guys there's a few tips and tricks that hopefully will help you in your backyard metal casting experiences thanks so much for supporting sharing and liking these videos so that I can keep making them and I'll see you the next video talk to you then

22 thoughts on “Don't Build a Metal Foundry Until you See This First

  1. What's up guys?! I've been wanting to make this video forever and really happy it's finally done. I hope it helps answer all your questions! If you have any more questions, just reply to this comment and ask away. I have to run out to the Chiropractor, then film a video with Cody's Lab, but I'll be back to read them all later tonight. Happy Casting!

  2. Just built the foundry. I am ordering the clay graphite crucible.
    I still need to build the cover. Is there any more information on aluminum vapors AND potential of explosion with the foundry made of Plaster of Paris/Sand?
    I would like to get my hands on a temp gauge so I can keep it at the lowest temp possible for aluminum.

  3. i have been thinking that you may want to try our foam crete. i know it has insulation propertys and very cheap if you make it yourself. im in the middle of moving so i cannot do this presently but would like to know if it would work

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