If I am going to melt metal I am going to need a pot to melt it in. While I wanted to buy a commercial crucible I did not want to spend the money on it and the tools to fit it. At least until I decided if this was something I was going to keep doing. Until I decide to invest in good tools I needed a cheap solution. I decided to make a cheap DIY crucible to last one or two casting sessions. This is just to see if I like casting metal.
Due to some of my experiments in filling 1lb propane tanksI have some empty tanks. While cutting into them is dangerous, I decided to do just that. To mitigate the danger, I pulled out the safety valve, and dumped it in a bucket of water to try to displace any propane still in the tank.
I then very slowly drilled a couple holes in the top of the tank. No propane smell came out of the holes, but I still filled it with water and let it sit for 24 hours submerged in a bucket of water. I then cut the top off of the tank, drilled two holes for eye hooks, and then heated the lip of the tank up to red hot and then wacked it with my hammer until I formed a pouring spout.
How to Make a Ceramic Crucible
This is a very simple and rudimentary crucible. However, if I succeed in making something cool the first couple times, I bet the wife will sign off on me upgrading my equipment. My main concern with using the propane tank is that the tank was brazed from two separate parts. I worry that when brought up to temperature, the brazing line will be the point of failure.
I used a propane cylinder in much the same way. Right before I was about to pick it up with the tones I noticed it was empty! Damn thing got a hole right in the bottom. Watch that sucker! We were working in the aluminum foundry in our high school shop years ago before there was a vocational school for my district and had a crucible break on us. Had picked the crucible up out of the furnace with the shaped tongs and set it into the tool used to pour from it.
Anyway, we got it in the pouring thing, picked it up, took a couple of steps and the bottom let go with the whole melt of aluminum.Making a Graphite Crucible
Since this was a school shop, the cement floor was kind of slicked up and waxed. Though I am an avid handgunner and reloader, I have NEVER cast bullets, that event with the aluminum having taught me that if God wanted metal to be runny, it would come that way, like mercury does!Even if its not a real crucible but can serve as 1! I recommend purchasing some sort of cylindrical stainless steel thin walled object, like a thermos insert i.
Mix dry ingredients in ratio. Add water while kneading until consistency of sour cream. Work quickly Reply 1 year ago. This fellah makes a crucible out of materials right at home. The only thing I don't have is the graphite, which is no big purchase for me. Hope this helps.Archeage emulator
Therefore, any material from that table melting at a temperature above C preferably considerably above is a good starting point. Answer 10 years ago. Problem with most crucible materiel isn't melting, it's burn threw from the heat think of it as very aggressive rusting. The bottom of steel medical oxygen tanks works great.
Answer 6 years ago. It's quite dangerous, as it may not start dripping until you take your crucible out of the furnace I've recently started working with copper, and the higher sustained temperatures are forcing me to look beyond steel Not excited about shelling out big bucks for graphite crucibles, so any ideas will be much appreciated!
Some have used empty disposable propane cylinders, but thin steel will not last long. I ruined my first furnace by attempting to melt scrap in a fairly thick stainless-steel "can", the kind used for salad dressing in restaurants. The steel burned through and the molten metal found its way to the bottom of the furnace. Use extreme caution when working with molten metal; you need a place for the metal to go if it decides to leave the crucible before you're ready.
There is a book by Vince Gingery on making crucibles at www. Hope this helps, Prfesser. Steel will work well enough. But if it's thin like foo-cans it doesn't last all that long before burning-through.
These guys made a heavy steel crucible L. Follow Asked by trf in Circuits. Tags: Crucible Forge Foundry. MistaJ 3 years ago. Reply Upvote. StefanT43 MistaJ Reply 1 year ago. LeoM 2 years ago. CarmenR1 4 years ago. Prfesser 10 years ago.Im new to the forge community and i need some advice. I built my first forge useing the charcoal and coffie can method.
The crucible i used was a soup that i burned through. I done that twice. While melting I got a lot of slag. Is that normal when melting cans? I also need a good crucible.
What can i use for now and where can i get a good one later. I plan to make a propane forge in the near future so a few tips here would be helpfull as well. Any and all advice would be helpfull. Try a depressurized fire extinguisher make sure it is steel then cutting the bottom off. The fire extinguisher is steel and should hold up well if you are melting metallics such as aluminum. Reply 3 years ago. I've used that, but after the second burn, mine is at the failure point, so they do work, and are a great size for the Mini Foundry model, you'll need several.
Scrap steel pipe should work just weld a bottom on it. Good morning. My name is Phil Wittmer. The link in your post titled "Crucible site" is a broken link. For information on ceramic crucibles you can visit Crucibles. I hope this helps. Here is someone's post in another forum on making a good crucible: Post on Crucible. Reply 12 years ago.
Make a Clay Crucible Mold
Reply 8 years ago. I am not positive. It would have to be something that could be fired and would not crack under high heat. Ive heard that if you use the clumping kitty litter, water, and fire cement you can easily shape a custom crucible.
The kitty litter gives it form and some heat resistance, and the fire cement prevents anything from melting through. I have found good ceramic crucibles here. Lots of slag is normal with cans. For a crucible, if you can't find a cast iron pot not pan, the sides aren't tall enough for the fire to keep the center hot you can cut the bottom off of an EMPTY compressed gas cylinder.
The small medical oxygen tanks work well, and are sometimes free when they don't pass inspection-very thick and last a long time without worrying about the slow heating that ceramic crucibles need. EMPTY portable propane bottles g?
Reply 11 years ago. Might want to ask granny where she gets hers, then ask them where the cylinders go that no longer pass inspection end up :. I can't believe no one linked to bacyard metalcasting. I have this bookand have built somehting similar.Elyse James began writing professionally in after deciding to pursue a career in journalism. She has written for "The Algonquin Times" as a general assignment reporter and published blogs and articles on Webcitybeat.2 2 61 u. 2016
James holds a Bachelor of Journalism from the University of Ottawa. Metal casters usually use a crucible that is made out of ferrous metal such as steel or cast iron. However, when these crucibles are placed into a direct air blast usually a furnace they are prone to oxidation and will eventually fail.
To prevent your metals from being contaminated by an oxidized metal crucible, you can make your own clay graphite crucible that can better withstand heat. Mix up your graphite clay. There is no specific recipe for creating graphite clay for crucibles because all crucibles are used for melting different metals. You will have to come up with your own mixture of graphite, silicon carbide, silicon material, glass and aluminosilicates. For a basic crucible, you will require 30 to 50 percent by weight of flake graphite and 10 to 50 percent silicon carbide.
Make sure you include high fire clay in your recipe so that your crucible can withstand the heat of the furnace. Form the clay into a crucible shape using a pottery wheel or by pitching it into shape with your hands. A pottery wheel will give you more of a symmetrical shape.
Fire the crucible for 7 hours at degrees Fahrenheit and allow it to cool overnight.
Do not glaze the crucible. Heat the crucible slowly to prevent the crucible from experiencing thermal shock. Every time you use your crucible you will need to heat it slowly for a few hours to ensure it doesn't crack.Meps medical exam
Creating the perfect crucible for your metal working purposes can take a lot of trial and error. Keep modifying your clay recipe until you get it just right. Pin Share Tweet Share Email. Step 1. Step 2. Step 3. Step 4. Tip Creating the perfect crucible for your metal working purposes can take a lot of trial and error. Tom Smith: Homemade Ceramic Crucibles. Show Comments.This is how I made a form for making clay crucibles so I could contain some of the awesome higher temperature metals without melting my crucibles.
So you made yourself a refractory and melted every piece of aluminum you could find. Not you, you wanted more. So you grabbed some scrap copper you found lying about and threw that in your cut down fire extinguisher or the small cast iron pot you took out of the kitchen when no one was looking.
Hey it was dusty and way at the back of the cupboard. No one will ever miss it. Maybe you even went to the store and got something that was supposed to hold up to the higher temperatures required for copper or silver or whatever metal you were trying. I did some of these things too. Then after melting cast iron by accident you tried some other forms of metal crucibles. This Instructable is for you! If I have to tell you to be safe because you could melt you face off and look like Darth Vader without the cool suite perhaps you should just read about how to do this and not try it.
Safety Middle. Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. I know you would rather be burning or melting stuff right now but we need a few parts so we can get started. We want our crucible to have a little more depth so take one of the 2 inch couplers and cut a short collar from it.
You will want the collar to be as straight as possible so you may have to sand the cut edge a little too. Take your second 2 inch coupler and sand the heck out of it so you can get rid of the pesky line in the middle. You will want to have a base on your crucible that is roughly the same thickness as the sides so you will want to take that into account.
Now that you have it marked cut it as straight as you can. I just used a hack saw and sanded it a little to clean it up. We need a really firm end cap on the inner piece for when we are packing in our crucible material.The King Of Random has done it again by building a homemade mini metal foundry with a steel crucible. It will melt aluminum cans with over degrees of heat provided by regular old charcoal and a hair dryer. King of Random. Safety is an issue, and Grant makes sure this is clear.
There is danger of getting severe burns if not handled properly. This is well worth the money for safety reasons. There are loads of off grid and homesteading uses for a homemade metal foundry like this. Even on the high end, this is probably one of the cheapest, reliable, backyard foundries that can be made.
The purpose of my backyard foundry is to demonstrate the most basic setup for casting metals. However if you plan to attempt this approach yourself, some important things to consider beforehand are as follows. The alloy was meant for extrusion, so is not the best for casting. They also produce more dross slag because the thin walls oxidize quickly and the plastic coatings on the cans add impurities.
A better source of aluminum for casting would be cast aluminum items from thrift stores, like electric skillets or small engine blocks from lawnmower shops.
If molten aluminum falls to the ground, it can superheat the moisture in the concrete and cause it to spall steam explosion where the aluminum lands. This can potentially send hot concrete and molten aluminum spraying everywhere. When possible, melt and pour metal over sand to minimize risks.
Note: Wearing polyester gloves like the ones I had in the video is risky because the material can melt into your hands if you get splashed by hot aluminum. Like this article? Subscribe to our newsletter to get more great content and updates sent to your inbox!
Log in to leave a comment. Sign in Join.But hey, it was fun. I have successfully melted Aluminum, Copper, Silver and various bits of mixed metals with these recipes.
Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. Fire clay can be found at most places that sell concrete and cinder blocks. They were really nice and the stuff is cheap. Slowly mix in water until it holds its shape when squished in your hand. This took me some practice to get it just right.Coc th12 base layout
This will help to burn off all the stuff in the clay that can contaminate the metal you may be melting and it will set the clay to make the crucible stronger. Get some charcoal, a chimney starter, a bit of dryer duct and a hair dryer to cook your crucible.
Place the crucible in the middle of the chimney starter. Fill the rest of the chimney starter with charcoal. Place it on something so you can fit the dryer duct under it. Once they are glowing red hot you can put the dryer duct in place and start the hair dryer on low.
Let it run until the coals have burned down about half way and add a few more on top. If everything went well you should have a crucible that sounds kind of like a coffee cup when you flick it with your finger.
Form the crucible using your favorite technique. The first time I tried using them they broke from the force of the Borax expanding inside of them. So I changed the cooking of recipe 2 through 6 with extremely improved results.
They need to be cooked in a kiln or some form of kiln to around degrees Ferenhight and held near that temperature for around 45 minutes to an hour.
Get your crucible a little warmed up before you put it into the refractory by placing it on some hot coals. Clay crucibles can handle the heat but you do have to treat them a little different then a metal crucible.
It seems to be pretty easy to address by simply setting the crucible on or in some hot coals after use so it can cool slowly. Reply 27 days ago. I'm wanting to make bar stock to make swords and other custom items. I've gotten a hold of about lbs of stainless. How do you feel these crucibles will hold up? Reply 2 years ago. Reply 3 years ago.
Reply 4 years ago. You gain strength but trade off how fast the crucibal can heat up. You'll also want to cool the crucibal slowly so it's not as likely to crack. I have not tried to melt stainless steel yet but most of what I have found says it melts around F.
How to Make a Clay Graphite Crucible
The fire clay should hold up to that without much trouble but there is a bunch of gunk in it that may contaminate your stainless a bit. If you find the fire clay crucibles adding some gunk try one with the kaolin, it is more clean. I'm going to look around for some stainless now just to give it a try. Keep me posted on your results. Question 6 months ago. Maybe I missed this, but how did recipe 1 turn out?
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