How To Turn Old Oven Into Kiln

Today we're going to be trying to turn this old oven into a kiln or like a burnout furnace for doing wax investments for aluminum castings.

Turning Old Oven Into Kiln

Now, to my knowledge, this has never been done before, so I have nothing to go off of. So we're just gonna have to wing it and hope something works. I guess the first thing to do is start taking this apart and see how it works.

Let's get started.

I started by removing the door and the central core of the oven. Yeah, that's probably the best us but I removed the old fiberglass insulation and put in some fabrics to see how they fit 10 of them fit in there pretty conveniently.

So I just slapped some mortar on there and chuck them in the oven. After that, I took some ceramic fiber blanket and I cut it to the size, put it in the oven.

This stuff is super cheap way easier than I thought it would be. You should definitely wear long sleeve shirts when working with this stuff. I kind of glossed over the first part about how I got to this stage, but I don't feel like that's super important because your login is likely to be different than mine and I didn't want to go into too much detail about it because it's pretty self explanatory.

The most important thing is the materials that you choose to build this with rather than how you build it, or how I built it. That makes sense. The materials I've used so far are insulating fire brick, a high temperature mortar, and the ceramic fiber blanket, I get that fire brick and mortar from a company called h wi harverson Walker International. And if you're lucky enough to live near one of their distribution centers, you can get this stuff at a really good price. So these fire bricks were $35 for a pack of 12. So it's three bucks of brick. I also bought their brand of high temperature mortar which is called the green therm four to one, I think, I'll put the link for everything down below. You can also buy this stuff on Amazon called like high temperature refractory cement. 2000 degrees is just as good. I've used that before. Also, I got this ceramic fiber blanket from skyline components online and it's a special kind because it's bio soluble.

That means that if you breathe it in, if you get it on your skin, it's not going to you know get in your lungs and sit in there like asbestos does and give you cancer then you should do with all fiber blanket, and especially

This bio soluble fiber blanket is apply a sealant to it, which is usually something like just colloidal silica in water and you just kind of spray it on or maybe use a thin layer of mortar over it because especially with this stuff, extra moisture will eventually degrade it and make it fall apart. Now let's install this digital temperature controller. It's a kit that I got on eBay contains the controller unit relay and thermocouple. So I don't think we're going to be needing this knob on the oven anymore for controlling the temperature. So that's where we'll put it. I just used a Dremel to cut a hole into the oven then gently forced that controller into there. Yeah, gently. Then I used to drill and I just drilled some holes through the fire bricks through the oven and I use the old heating elements from the oven and just stuck them right through with some extra wires attached. Then I just spray painted the oven for the rest of the night. After I finished painting the oven I spent the rest of the night wiring up the heating elements. One thing I didn't show you is that I put I took out the old insulation from the oven door and I put in this rock insulation. 

I don't know if it's any good. It's, it's probably pretty good. Let's see how fast this heats up how hot it can get. I've got my crucible here, we'll put in some scrap aluminum and chuck it in here.

All right, I sent it to 700 degrees and it's rising pretty fast but I think it's still gonna take a while to melt the aluminum and get it to temperature. So in the meantime, remember that time where I said I'm going to show you around to my new place. I'll show you around a little bit but first I want to show you something and then I never did. How about while we're waiting for that to heat up I actually show you around this time. This is what the garage look like when I first moved in but after a ton of work. This is the welding table I made it's a half inch thick steel. This thing is super sturdy. It's not going anywhere. These are some cool lights. I made favorite part about these lights. They change color temperatures. So depending if I'm filming at nighttime or in the day or I just want some mood lighting or something I can change this. These are fluorescent lights and I got fluorescent lights because they don't flicker on high speed camera like some of the LED lights to like those, this is my storage area this is I built these shelves This is was a project of mine it took longer than it should have, but we've got some pretty good storage in here now.

I also have a pool.

Now that it's Michael I don't really feel like Pouring Molten Aluminum and this is what my backyard looks like right now. And that's probably why I'm not gonna be doing videos back here for a little bit because the ground the entire ground is flammable. This is the front yard area right here. And I think this would actually be a perfect place to film maybe put up some like trees along the road there so my neighbor's can't see what I'm going up. Okay, going back towards the garage area. I think the raccoon lives in bear somewhere. Okay, let's see what the ovens on. All right, so we're at 700 degrees Celsius, the aluminum should be molten by now.

Well, well, well, that's hot. So it's been on for an hour and it seems like it's maxed out at about 786 degrees. Let's see if it's multi.


Wow That's hot. Oh my gosh. Wow. I'd say that works that thing is super hot on the inside. Pretty much the reason I made this up it was to help me with aluminum casting. Now I can print stuff out on my 3d printer and put it into a box in case it in plaster, put the plaster into the oven and melt the plastic out that will leave a hollow void so I can fill it up with aluminum so that's what I'm going to be doing right now. I have this cardboard box I lined it with fiberglass and that should help with the structural strength of the fiber of the plaster so it doesn't break apart in the oven. And then I made this. These are some 3d printed parts I printed it up yeah 3d printed parts I printed out and I made you know I screwed them up like this. I'm going to put it in here and fill it up with plaster. Let the plaster dry for a day. Then I put it in the oven for six hours at 200 c six hours at 400 C and finally six hours at 600 degrees Celsius. I kept the oven at 600 degrees while I was melting some aluminum in my foundry.

In and I reinforced the outside of it with sand. Then they use the leaf blower to blow out all the extra debris or anything else that might be left inside the moment that I poured some aluminum and waited about 3010 minutes put out some slight fires and then I came in there with a hammer and I shipped it out a lot there was a little bit of aluminum that got out the side but that's what the sand was for to stop it from leaking out that I use my hose to blast off the hot plaster and I was left with some pretty nice aluminum castings. These things are pretty smooth and they really picked up the detail from that plaster.

I'm super excited with how well this thing worked for the first attempt I ever had a doing a loss PL a casting like that.

That was a different plaster block that I showed you on video. This is a plaster block I made a couple days ago before I even filmed this but the pieces came out really good. You could really tell that the plaster held on to the detail on that 3d printing.

Anyway, this is a really cool project. I hope I inspired some of you guys to make it the class was about $270 would be a lot less if you use all fire bricks instead of the refractory blanket as well and the oven was $40. And if you got that free, I think the cost would only be like $150 total.