ฝัง
- เผยแพร่เมื่อ 14 ต.ค. 2014
- I experiment with using an old clay flower pot as a small backyard foundry. Dangerous and not recommended as shown.
This idea originally came from the excellent SVseeker web page: www.svseeker.com/shop_foundry.htm
Camera: Nikon Coolpix L820 - แนวปฏิบัติและการใช้ชีวิต
![[MPD직캠] 베이비몬스터 치키타 직캠 4K 'LIKE THAT' (BABYMONSTER CHIQUITA FanCam) | @MCOUNTDOWN_2024.6.13](http://i.ytimg.com/vi/h99J4vWm7Ew/mqdefault.jpg)
![ทัศนศึกษาโรงงานผลิตโค้ก [THAI/ENG SUB]](http://i.ytimg.com/vi/M9y-TJBNem0/mqdefault.jpg)
that works so good I can't believe how well just that tiny little furnace works and the little casting you made of aluminum is incredible thank you so much for sharing this you do the coolest things on your TH-cam channel and not just Cool, But Very Useful!!
The cover should have a 2 inch hole in the center to work properly. And the hole in the pot should be at an angle to make the flame spiral around the tin can.
Very nice indeed. I have seen these flowerpot furnaces before. They are usually lined, sometimes with cement, or better, castable refractory. As to the lid, don't give up on it. Just drill a 30mm (size not critical) hole through the lid. That will give you draft for the torch. Also myfordboy's channel has an excellent series on furnaces. His torch goes through "tangentially" to the pot, so you get a swirl effect on the torch.
Great experiment. Thanks for sharing.
Would't it work even better when you put your torch in at an angle in order to get a swirling flame around the melting pot, and make a fairly large hole in the lid, so the gases can escape? That's how the larger furnaces mostly work. cheers.
Flip de boer Sounds like a good idea. This video is bound to get lots of ideas on how to improve the experiment :) All welcome. I just tried out the original concept, and got it working with a regular LPG gun. More time may get it going better. Cheers Rob
How is that flower pot not shattered into pieces?
Thanks Rob, another great idea you have passed on to us mere mortals. We got lots of old terracotta pots so will definitely give that a try. Breaking down all the old hard drives today.
G Coop I don't like the idea of the pot cracking, so do it on the ground to be safe. You can get the same effect with an old paint or coffee tin, except that you lose a lot more heat. Cheers Rob
I am surprise to see that your drill operates with a clockwise direction. I thought that in in Oz they would rotate in the opposite direction.
If you put as much of the pot underwater when you are drilling it will damp out the vibrations. Less chance of breaking the pot.
This worked so well that I'm making a durable small furnace just for this LPG torch. It's not a flower pot design as I think the tapered shape of the pot is a bit restrictive compared to a cylinder shape, and the pot is not very durable. I even spent real money to build this so it had better work. My next video. Stay tuned. Cheers Rob.
xynudu You look at the subject from the wrong place . not to melt the important thing is to melt the metal form .
Nice video, Rob. So simple and easy to make. I was impressed with the ingot you poured as to cleanliness and purity -- I could not see any inclusions -- considering the method employed in getting there. Some of the most impressive castings I've seen, as to their quality and complexity, were found on MullerNick's YT videos... which include videos on hand scraping, etc. Thanks for posting, I'm a great fan of yours. Cheers, from California, USA.
If you spring for a masonry hole saw, you can pop the hole in neatly in one pass with less breakage risk.
why not a side opener for cutting the can ring lol
watching this 8 years on and all I can think of was why didnt you use a can openeer instead of a cutting tool to open the can
Nice work Rob
I wonder if you fill in the pot with a bit of a vermiculite and cement mix if it improves
Very good! Thank you for your important experience! God bless you sir!
I was wondering if a flower pot might stand up to my burners so I could use them as a crucible. Steel vessels dosen't last 5 minutes in mine but then I realised flowerpots would have a hole in the bottom. Still, Might be ok for seperating out the steel from aluminium and copper when I melt things like alternators and starter motors.
I like simple and easy ideas like this. Thanks for showing what you came up with.
Oil Burner I wouldn't use a flower pot as a crucible. No way. It's brittle, cracks easy and would be totally unsafe. A proper crucible made out of the right stuff would be the only way to go for what you are doing. Stay safe. Cheers Rob
Pop a hole in the middle of the lid, the same size as the burner hole, and you'll get even better results.
Thanks I Was Wondering How Large Of A Hole I Should Drill In The Lid.
Robert,
I built a similar setup a year or so back, with a few differences you might want to consider.
I used a flower pot about the same as what you used, hole and all. But I put it inside a metal can about 100mm larger, that used to contain pretzels or chips. I filled the gap between the pot and the can with grout mixed with Perlite (available at the local garden center). Packed it in real good, it took a few days to dry really well. This keeps the pot intact should it crack eventually and acts as a insulator/heat sink.
If you want to use a lid, use another flower pot like the one you had (upside down) with a hole in it to act as a chimney. Burner must have outside air to work properly.
Before you can use any metal can that previously contained food as a crucible, you must burn it empty to get the plastic lining out of it. Or else you end up with that crap in your pour.
One more tip, if you want to pour bars of a consistent thickness, prepare a level spot to set your mold on. Otherwise they come out lopsided like yours did. Cuts down on wasted material and machining time.
Best Racing Tips Win At The Dragstrip Sounds like you've nailed it. I will take up your tips next time around. Thanks for posting. Rob
xynudu When the perlite/grout mix hardens, is it capable of being used free standing ? Could you say put a tin can in a bigger tin can with the mix between them and then remove the cans after it dried - would it hold up with heat ? Rob
Best Racing Tips Win At The Dragstrip "Before you can use any metal can that previously contained food as a crucible, you must burn it empty to get the plastic lining out of it.".. Totally agree there. Sometimes the lining is white and sometimes its clear and you cant see the lining, but it is there. Its probably even more important to pre burn it out if you are using the tin as a mould. What I found if you don't burn it out is its more likely to create porosity/voids when you pour the ally into the can from the lining burning and releasing smoke/gases.
Exactly.
When i used a flower pot it cracked really badly and molten metal and coal went everywhere. Watch yourself buddy. Use 50/50 mix plaster of paris and sand and line your pot with 1-2" of the stuff. That'll act as a pretty good heat shield.
Paddy Cusack would water based clay work as a heat shield as
well?
+toppertruthio I would imagine so
Paddy Cusack that's not what heat shield means.
And just smash the pot when dry, and you have a perfect cement crucible ! no need for the pot.....
Amazing experiment ! Really liked :)
Great work! Right now I'm still using a hair dryer, charcoals and bricks, but im going to try this one. Thanks : )
Wouldnt it work using the existing holes in the pot? And the lid the same with an inverted pot ontop? Im wondering i need to make a kiln and need something thatll work, thanks sam
This looks very interesting; I'll be giving this method a try in the future. Tony
Hi Tony. I don't really recommend it as the pot can crack with the heat. I point out it's a bit risky. It works but be careful. Cheers Rob
Thank you mate!!
Interesting how the crack at the front of the pot went through the hole - a pre existing stress line?
A hole in the lid will help with air flow and will allow you to drop more scrap in the pot so you can pour more each time.
It would be a good idea to place the burner hole of too one side, as this will drive the flame round the back of the tin can crucible. Also perhaps make a hole in the lid so the hot compustion gasses can escape that way whilst keeping more heat in. Other wise it looks like a goer to me, thanks for sharing
Laurie
Out of curiosity id be interested what the difference in weight of gas is to melt such volume.
This is the idea which i waiting for it thank you
Use the can opener turned the other way to cut top of can off.
What you need is a heavier stainless crucible that can withstand high temps, and hold a ton of heat...like a small saucepan or fondue pot.
thanks for the video it answered a few questions that I hat about the melting threshold of tin vs aluminum.
+crgaillee Fyi tin would not make a good crucible because it melts at 231 C but aluminum doesn't melt until 660 C .... so what gives, why is this guy able to hold molten aluminum in a tin container, at a temperature more than double it's own melting point.. actually probably more than double. Well the "tin can" is probably mostly steel, with tin plating.
Brew Dain because cans aren't made of pure tin...
Mike that was the whole point of my comment. Read all the way to the bottom. "Well the "tin can" is probably mostly steel, with tin plating."
can you make it without a brutane torch and use like charcoal
Would a 5" grinder cut that tin can in 1/20 the time ?
Just to chuck my twopence worth of ideas how to keep it simple and get a better result into the ring. I think lifting the flower pot up a bit (support it on two bricks) would allow air in through the bottom (could try putting the flame in through there as well) hole, then put a couple of bits of steel rod in the bottom of the flower pot to lift the can up a bit, for the lid, use another inverted flower pot which fits outside the bottom one would give a hole for the air flow in the lid.
Stephen Deakin Yep, definitely didn't breath properly, even when the lid was canted off. All good suggestions. Cheers Rob
Wouldn’t a fostner bit go better in the bigger hole?
Just wanted to say what a great video. But I have a little suggestion for you to possibly try. For your lid you used for the flower pot furnace, use the same lid you did but try and drill a hole in the center of the lid so the heat has a way to vent out a little. I made a little furnace from a tiny paint can and had the same issue with mine until I put a hole in the center of the lid and it worked out great for that. I'm just curious if it would work on the flower pot lid. Thanks for the video and it was great and I'm going to try and make one.
Hi Corey, that video was done quite a few years ago and I've experimented more and moved on since then. Yes, a lid with a hole in it that can be regulated is the go for best effect. Plus you can heat up the mold by placing it over the vent hole. Clay pots are not very safe to use and it should all be placed at ground level in case anything goes wrong, so that molten aluminium will not spread as easily. A paint tin furnace is a better way to go. Play safe. Cheers Rob
It works better with the lid off? Why? More air?
I have salvaged a silver stainless steel microwave casing which provides a fantastic melting space. It also has the wiring holes which serve as the air entry and exit points and is raised off the floor so when stood on a paving slab is fairly solid. I line the inside floor with firebricks around the edge with a 1" gap all around between the bricks and outer. I fill the 1"gap with vermiculite and then put a 1" layer of refractory cement all over the top of the bricks before laying a mesh across and a 2nd layer of firebrick on top of the bricks only. Ensure the small air (former wiring) holes are exposed and then simply close off any areas of vermiculite at the front with refractory cement and allow to dry/set. Later, return with your blowtorch and melt to your hearts content. You now have a movable furnace where the casing and stand should remain fairly cool and not melt and hopefully it should last for ages. I have been using mine on a weekly basis for over a year and its only getting sooty inside and just occasionally needs a sweep out. I would recommend the stainless steel cases as white colour innards have microwave paint coating and I'd hate you to get gassed.
Great idea Nigel. I suppose you could also use a stainless steel electric bread maker liner/tub for smaller quantities. Got me thinking. I must keep a lookout in the roadside trash.
Cheers Rob
Make a small hole in the lid to vent the fumes out and create an air flow to pull fresh oxygen in, as a flower pot has a hole in the base, kine the flower pots with plaster of Paris as an insulation layer.
Hi Bob, what kind of gas did you use for your torch, was it propane or mapp gas ? please let me know, thank you for great video, cheers :)
It's propane. In Australia we call it LPG (same thing).
Rob
xynudu where i live, we also call it LPG, cheers
your aluminium looked very clean and freeof dross.AM i correct?
It would probably work better with a hole in the lid and angle the burner to somewhere around 30°- 45°
How much time it took to melt after gas fire ??
Pretty sure that a diamond tipped ceramic tile hole cutter (low cost sets on eBay are very good) would almost certainly make a better, cleaner, faster, simpler job of cutting the hole than masonry bits.
Bob Lewis cool, that's what I planned
use.
Nice one I'll try it out
Gday mate. So we get one step closer to the xynudu aluminum smelting company. Great video, thanks for sharing.
Hi again Rob, no I'm not stalking you, I've been down with a bad flu so have spent all day watching almost all your vids. Do you chuck any sort of aluminium in the pot such as drink cans and stuff? or are you selective for stock material?
regards
Wal
Walter Cengia Hi Walter. I sent a reply, but it seems to have vanished, so I may repeat myself.
I am selective. I use hard non bending alloy for rigid, hard wearing jobs like gear blanks, and blend in some softer alloy when I need a better finish for turning.
It's all a bit hit and miss, but is OK for backyard melting.
Cheers Rob.
You need a step bit.
Also, put that torch through the hole at an angle, so the heat circulates more evenly around the crucible, rather than shooting the heat directly at the crucible. The aluminum will melt more evenly that way.
Hi Guys thank you so much for the the wealth of info posted on this particular Video thanks a million Xynudu for generating so much curiosity as a result of your experiment. one question. The melting point of aluminium is higher than can or not ? my question in particular the can should have melted before aluminium ! I may be wrong
No. The can is made of steel and has a much higher melting point than this furnace can provide.
These days can joins are rolled/crimped together, otherwise it would fall apart under the extreme conditions.
The whole experiment is unsafe and shouldn't be attempted without proper precautions.
Cheers Rob
That flowerpot is a write-off! The problem with the airflow is probably due to the fact that you used a stand as the lid, without a vent hole. Using two flowerpots or perhaps a metal plate with a hole in it as the lid may yield better results.
All furnaces I have seen thus far have an opening at the top.
I'm still investigating the ratio of the melting chamber versus width versus the vent hole diameter. What I've come up with thus far is a 2:1 ratio. The furnace under construction is to have a melting chamber diameter of 21cm and a top hole size of 10cm. The internal height of the chamber will be approximately 36cm.
Happy casting!
Leo Gijssel Thanks Leo. This was a quick and dirty experiment, but I'm getting lots of good suggestions on improvement in the comments. So I will revisit this and make a propper small durable unit. Cheers Rob
Brilliant. Maybe another similar pot with hole in the bottom would have worked better as a lid?
Also put some steel wire around the pot to hold it together if it cracks.
Angle the torch to blow around the crucible and then cut a vent in the lid which will allow excess fumes to exit whilst maintaining a high temperature and allowing more material to be added
I have never tried this but I think that idea would be best.
Nice work
Hi rob. You need a vent in your lid. I have seen that done also the tin can is only good for a few times you can buy cheap crucible on eBay. Please be careful. Thanks for sharing.
Few right sized holes in the flower pot lid may have solved the lid problem
Awesomeness! lol. Great job!
Hey buddy - Are you still into the furnace game??? What area of Oz are you from? If you're still working on it let me know and I'll share a few pointers with you
Eat enough of those premium Baked Beans, you probably don't need the Gas Bottle either... xynudu
Emma Ritson :)
Beautiful ingot.
wait is that a empty can?
Great video, maybe you should invest in a diamond tipped hole saw, they are really cheap now days.
Love the video. I was thinking if you could make a small microwave kiln with a small flower pot and the top piece as the bottom of the kiln. I have been looking for a good homemade microwave kiln. I think this could actually work as a microwave kiln also, but I want your opinion on if you think if you took a small flower pot and use the bottom piece as the base. Thanks for sharing I love this Idea,
+Steve Rabon
Hi Steve. I don't know anything about microwave kilns, but theoretically you may be on to something. I suppose the issue is how much the pottery would reduce microwave penetration.
Also, the pot would still crack under the temperature changes, so lining it with refractory cement would be the go.
Interesting idea.
I suppose the only way to know, is to do a small scale experiment and see what happens.
Cheers Rob
Thanks for the reply. I know some people has used the fire bricks to make one. I know they can withstand high temperatures. This would just be a cheap alternative to a homemade microwave kiln for melting glass to make jewelry. I would use the fire brick if I wanted one to melt aluminum. Thanks I was also wondering when I seen the dusk that was left on the counter if you could pretty much use the powder as mortar and pretty much make a shape that would work better. I have had an head injury and I am not as smart as I once was and people have to tell me if stuff sounds stupid. LOL
+Steve Rabon
Hi Steve. All sounds good to me. Nothing stupid in what you are saying, for sure.
Just be careful, this is a dangerous environment, so stay safe.
Cheers Rob
+Steve Rabon
Hi Steve. That's a pretty handy little kiln. Unfortunately he doesn't seem to have followed up with a video on it.
I think that is a better way to go than a flower pot. Looks to be made from refractory cement. Maybe just cast it between a couple of plastic containers you can pull out/off after it sets.
There must be some info on making these on the internet somewhere.
Maybe search on making a homemade ceramic refractory crucible, should be a similar technique.
Cheers Rob
He bought that one on Amamzon. It is made for making Jewelry. I was thinking of a way to make a homemade one. I been studying up on it. It is a layer inside the kiln that actually turns the microwaves into heat. Just using the flower pot won't work, but you can make a paste from grapheme and use that to cover the inside of the flower pot to create the heat needed. Thanks for your replies. They have helped me a lot. I will try to make two kilns. One to melt glass for jewelry and one to melt Aluminum. I have found another Video that uses fire brick to melt Aluminum in the microwave also. Thanks again. I think I know now what is the best way to go. Yhanks
What did you make the form that you poured the molten aluminum? It doesn't look like steel because it seems like if it were steel, it would be way heavier. Thanks for the vid!
+altitudeca
It's a stainless steel bowl from my scrap bin. I'm not sure what it was originally, maybe a cap for some part of a machine.
But, definitely stainless steel. Some people cast into stainless steel cookware - cookie cups etc.
Cheers Rob
+xynudu Sorry, I meant the thing you poured the molten aluminum (out of the can). The square container that looks like it's welded together to the left of the forge. Thanks!
+altitudeca
The mold at the end of the video is made from some rolled "U" section racking steel.
It's about 2 mm wall thickness. I stick welded some ends in.
Bit rough, but works OK.
Cheers Rob
+xynudu Cool. Thanks.
how much do you loose in weight when you melt alu. down?
jetegtmeier71 I doubt it would be much. Dross would be the only loss, and that would be less than 5% I expect.
***** 50 % no kidding and they say you should recycle alu. i'm glad I do
***** Hi Sebastian. Thanks for the feed back. I had never really thought about this, prior to the original question, and assumed only the dregs would be lost. That's very interesting. I will check next time and see how it goes. Cheers Rob
I thought the cruicible (the tin you used) would melt faster than the aluminium inside it ? What type of tin did you use ?
Steel doesn't melt at the temperature of aluminium.
You needed to cut a hole in the lid so you could add material and it would also allow the fire to breathe it would heat even faster that way.I suspect the reason the pot cracked was due to moisture in the terracotta pre heating it at a lower temp to drive out any moisture may prevent the cracking. To be safe I would suggest a couple wire hoops to keep it from crumpling, in that event.Gabby
Or have two terra cotta flower pots stacked, widen the hole in the bottom and use a fire brick or two for a stand for the crucible and furnace.
The guy you linked to did not really use flower pots. He used the pots to line with castable refractory. Or high heat mortar basically. That's why his are holding up much better.
Aaron Kimmins Your right. I didn't read that bit. That's why the pot is cracking up. Good point. However, the principle is still the same. Just needs a bit more refinement. Rob
Exactly, very good idea for an inexpensive furnace!
Nice job, Rob! The trouble with clay pots is they don't like thermal shock. If you had preheated the pot before you got down to business, it may not have cracked. They make special high temperature cement for making forges for melting metals. Check out Keith Rucker's TH-cam channel as he melts Babbitt for bearings on the old machines he restores. I also liked Emma's comment! Thanks for the video.
Have a good one . . . and eat more beans!
Dave
Swarf Rat Yep, that pot was doomed from the moment I laid my hands upon it. But at least we proved that a plain old LPG torch has enough guts to melt down a decent sized amount of alloy in the right conditions. So expect more on this subject. I don't give up easily. And however I do it, it will be cheap :) Cheers Rob
Even with a slow heat/cool down they crack...eventually!
can you riddle me this, since I have no working experience with melting anything other than lead for historic munitions casting. The melting point of aluminum is 1,221 degrees F, and the melting point of tin is 449.5 degrees F: the tin can doesn't melt in your video, but the aluminum does. How is this? I want to use a pot to sit on a forge I'm building and it's stainless steel, but some of these stainless steel pots have aluminum fused into the bottom for "even heating".. Would this pot's bottom melt? As I said before, a novice and trying to understand how this works.
1958piwo To the best of my knowledge, tin cans are made entirely from steel these days, so won't melt or fall apart in this application
I'm not up on cooking pot construction :) I expect the aluminium bottom is just a lamination, and would melt off the stainless pot, leaving the bottom intact.
Cheers Rob.
Not everybody has gas.
Try the same thing with charcoal and a hair dryer might be more interesting.
I thought the base of a lawnmower was usually made from a magnesium alloy?
Green Silver Generally pressed steel or cheap aluminium in lawn mowers. Magnesium is not used much, except on items that need to be very light - eg. chainsaws and hand tools. The problem with magnesium is that it's more expensive, and fatigues over time. Mag wheels on cars are not actually magnesium, they're aluminium - because of the fatigue issue. Rob
you needed a hole in the center of the lid
Very nice Work
Hey mate, What type of regulator is that between the gun and gas bottle?
thanks.
No regulator.
Straight out of the bottle at full pressure.
Cheers Rob
thanks buddy, gonna give this a go
can u melt copper using the same.method
I don't know. I've not tried that.
y u do dis
Another good demo vid Rob. My lpg torch is identical to yours, its my old mans ex pmg/telecom, companion brand torch, on oldie but a goodie. To be honest, I never attempted to melt aluminium with it but now I know its up to the job for small melts, I think I will be making a mini version of my current furnace. Then maybe have a go at some small lost wax castings for model engine parts. I was holding my breath the whole time you were drilling that hole and laughed my head off at your "oh well, I'm off to the bank now" comment at the end :D
djpaulk No luck at the bank :)
xynudu Would you use a spiral flame effect (offset burner tube) or point straight at the centre ? I doubt these guns are big enough for a spiral flame effect. What are your thoughts on this? Rob
djpaulk I've made mine with a straight in burner port, but I could easily grind it out on the inside to make it angle. I've just used 1:5 Portand cement and perlite. Hope it holds up with the temperature. A few people on the web recon this is OK, but remains to be seen. You can mix it from 1:4 to 1:8 according to the construction site specs. Takes quite a while to dry out, even with our 30+c temperatures. Rob
xynudu It should hold up to the temp ok. Glad you did not go max ratio with the perlite. While perlite is a great insulator and dramatically reduces weight, its also very fragile, weight should not be an issue with such a small furnace anyway. Did you leave a tin can inner form in? Did you add any steel wire or anything for reinforcement? Hope you packed that stuff in well to minimize voids in the refractory...Keep your eye out for a bag of fire clay. You can use the left over to make green sand, knock up a few flasks, make some patterns for things you want to cast and away you go.. I am hoping you get some nice warm weather down there and eagerly await your next vid.
Thanks for sharing your trials and tribulations.. Kind regards, Paul
djpaulk Hi Paul. This time around I used a regular paint tin (4 or 5 litres ?) as the outer, and a 500 gram coffee tin as the inner liner. This makes a good sized centre and will take up to a large fruit tin as a crucible. I left the two tins in place after packing in the mix. No reinforcing but I rammed it well. Be interesting to see how it performs. Rob
I made a furnace that works really well, probably too well... I use charcoal and a vaccum, and I try to melt melt soda cans and stuff. But as I mentioned it gets too hot and the containers always brakes after a while... Do anyone know what I should use for container? Does stainess steal work?
Johan Strannelind Hi Johan. Use a piece of large diameter steel pipe with an end welded in. That won't burn out in a hurry. Not sure about stainles steel. It is used for m/cycle exhaust systems and cook ware, but the temperatures are not excessive. Rob
+Johan Strannelind Check out Grant Thompson The King of Random's channel for a very nice furnace.
WELL that was Iwill try this idea with slver .
At 10 : 30, what kind of saw did you used ?
A small friction/abrasive disc (metal cut off disc) in an air pencil die grinder - you could use a Dremel. Cheers Rob
3:49 ..maybe a diamond or carbide hole saw ?
it cracked bc you didn't heat it up slow..... take the torch and hold it above the pot and let it heat up for about a min or 45 sec. keep the flame 6 to 8in away from the pot when doing this
Well done! It looks like a hole in the lid about the same size a your burner might help. I would have chickened out before you did when you were using the largest carbide bit!
Metallurg33 You may be right. More air has to come in from somewhere, either top or bottom. Needs more experimenting with a lid on. Lot's of potential for an ordinary LPG gun. Rob
xynudu
I'm not sure if you need more air in or let the products of combustion out. If its the latter, you might need even more open space.
Rob, since we've talked before I know you haven't burned your shop down yet! :-) The cracks in the pot we're making me nervous. I was envisioning an aluminized Rob! Most surprising to me was drilling that hole. I had no idea a clay pot would be so damn hard to drill. If you had turned and internal wood plug you could have jam chucked it, so you'd have two handed drilling. Hey! Did ya clean that shop vac filter yet? ;-) Cheers! Chris
The whole pot idea is not really a good idea. I only left the video there because it got a lot of interest. My paint tin furnace is much safer, insulated and cheap, so there's no reason to use a clay pot. The shop vac gets plenty of use. Cheers Rob
@@Xynudu Rob, please post the link to that video.
73's Chris
Here you go Chris:
th-cam.com/video/Osa_c1XkjQs/w-d-xo.html
I made that seven years ago and it's still holding together and being used regularly. I have the bits to make a larger version out of a 10 kg propane cylinder one day.
Cheers Rob
did this in a concrete flower pot with charcoal and no external oxygen just a vortex feed
you know that a hole in the lid woulda worked like you wanted it to ??
and a half a brick under your crucible!
first few seconds i thought the video frozen, or a still
image
Does ur username have to do with rush??
I like this old video, however, I'd like to suggest you first give the pot/tool a few coats of water glass, inside and out, allowing each to dry completely, before moving on.
Secondly, use 12.5 - 25mm ceramic blanket, as an inside liner, glued on the outermost side, with more w.g. and when dried spray the other inside fabric with several layers of the same it until the material is very firm to the touch.
Line the bottom with a layer of ceramic cloth, with w.g.treatment, raise the bottom with a layer of another 25mm, using pearlite, again waterglased.
Make a second hole I to the side of the pot, beforehand, for a 25mm air inlet, to which you add a pipe with a long hose, and a hair dryer on cool.
This is your air supply and will increase the heat, saving gas.
Good luck, and I've seen you other video with the paint cans.
Thanks for the suggestions Eli. My next furnace will be made out of a scrap 9 kg LPG/propane cylinder, or a small air compressor tank I have behind the workshop. Thermal blanket lining was part of the plan. Plenty of people have done this and they work very well. Cheers Rob
That was cool.
Australian right here he's got his Coles beans
Think why it does not worked with the top for you case the top was much smaller then the bottom. On the site the top is the same size as the bottom try to get an other pot and try again. Probably you can reach higher temperature with the top on.
The torch wasn't getting enough air with the top on. Unburnt gas was burning on the outside around the rim between the pot and lid, where it was escaping. A larger pot on top wouldn't help in that situation.
xynudu the top pot needs a hole in it for bot exhaust/flu and to allow O into to burn. Your pot base didn't have it. Most likely the original design of 2 identical pots did.
so I've been doing this and using cans as a crucible they are not working they are flaking
any suggestions
Make a steel crucible out of some scrap heavy pipe.
Rob
Ok I've given that thought but don't have welder to make the base
OK, maybe look in the cooking section at the supermarket for a stainless steel beaker or pot that will do the job.
The local good will and flea markets also have this stuff for peanuts.
Rob
+xynudu thanks comrade
Very nice job sir! But as you suggested to prevent cracking, cement would only be worse. Clay is far more resilient to heat than cement concrete.
unless its insulating concrete or whatever its called.
It's called castable refractory. It works like mortar, except it has aluminum oxide or silicon carbide in it instead of rocks and sand.
Hi nice test. But be careful. Please do your experiments on a bottom of dry sand. It s easy to burn a hole in the tin can, the molten alu drippes out of the burned hole through te burner hole. Everyting the melted metal contacts will set on fire... Don`t think about when someting is dripping from the bench over your shoes! Melting metal : use precautions, even when its only a few cubic centimeter. Grtz Jan. (Did several wvo furnace alu melts)
compujan Yes, always play safe when handling molten metal. Rob
the lid put on over the pot, needs a hole in the lid . . . you can slow down the hot air . . . but . . . you do need to release the hot air at some point . . . or break the system
Patrons Incentive OK. The mark two version will have a hole in the lid. Cheers Rob
Just some advice, the flower pot cracked because you heated it up to hot to quick. The flower pot is like a clay crucible you have to heat treat it, heat it up slowly multiple times hotter each time to heat treat it. Oh ya Aluminum only has 1 "i" in it, I saw you misspelled it in the video title!
Aluminium! Anywhere other than USA.
The pot was cracked 👀