Thanks Guys. You have been great over the years. You have enough knowledge now to move on and come up with your own innovations. Mean while i am going after life long dreams. Love you guys

@adrianmucci4860

10 ай бұрын

Thanks for sharing this information. Is pure gold. This formula is enough for cast iron? Sorry for my English.

@rlbob1

10 ай бұрын

@@adrianmucci4860 Graphite is mainly for non ferrous casting. You would be better off making a lot of disposable clay crucibles for iron or steel. Dry them in in the oven then fire them in the foundry. Make sure you have driven all the water out before ramping the heat up. Boiling Point of water at your altitude is critical point in the oven. My oven was 20F lower and i blew one up once i started ramping the temp. use high temp probe or thermometer.

@Olisha.S

9 ай бұрын

@@rlbob1would this be sufficient to cast aluminum oxide (Al O3)? I want to make an ingot of corundum / ruby / sapphire. Honesty I was thinking of putting down a sheet of corundum and adding the chromium and other dopants to “paint” a design on it, hopefully getting the temperature just right for it to fuse and turn into ruby and sapphire without losing to much definition. I’m planning on using either map gas, or hydrogen + oxygen as the heat source. That should be sufficient right?

@absolute___zero

4 ай бұрын

@@Olisha.Sahahha! growing crystals is a very complex thing, there are various processes and lots of machines have been made, that cost up to quarter of a million bucks. You can't just expect heating alumina and magically for it to convert to sapphire, the atoms must be excited and then cooled to find the lowest energy spot between them, this process requires very fine temperature control and engineering, otherwise you will just wast energy and lose money. Check out how the grow sapphire cylinders for smartphones.

@Rezin_8

3 ай бұрын

❤whoever smelts the gold; makes the rules 😅😂🎉

Superb video from a humble engineer - "please send me your improvements, I'd like to try them out". People like this are gold-dust.

@hairyballbastic8943

3 ай бұрын

they're the whole nugget bro

First of all yer a God Damn CHEMIST my friend and second,FINALLY someone wearing proper aluminized safety protection! I used to run a 2 million pound a year aluminum smelter and the number of people on KZread running around in tshirts melting metal with zero safety gear on just blows my mind! Great video!

@noahwolfe1304

6 жыл бұрын

CdnCarWrapper or barefoot. Dumbasses

@choiboi1462

6 жыл бұрын

I think the main reason people don't use this kind of gear is because they don't know where to get it from and if they do don't have the money

@zanpekosak2383

6 жыл бұрын

My idea why they dont use proper safety is that the metal doesnt glow red hot. People are generally afraid of red hot metals but not metals that look molten similar to when solid.

@hokiepokie333_CicadaMykHyn

5 жыл бұрын

I only smelt in my crocs... 👷🏽

@zanpekosak2383

3 жыл бұрын

Exactly. When we were kids we played with melting lead and nobody thought it was a safety hazard. I had the pot almost explode several times.

A visible demonstration of one determined guy,I salute you.

I thank you for educating me and taking away years of frustration from my life.

You sir are a true artist.

I love your 3-section furnace. That makes crucible removal so much easier than what other people do.

Thanks so much for posting this. I have wanted to build my own crucible for a while now and after seeing all the hard work you put into that beautiful crucible, I think I'll just buy one. Again thanks for posting.

Most of what this Gentleman has revealed would in fact be proprietary knowledge / Trade secret of firms. Amazed at his out of the box thinking ! No words for his Genius ! Thank You Sir & My Respect !

God bless you sir, and the internet.

You did a fine job - respect!

Happy New Year bud...... You are the man! I am so happy to see the dedication hard work and pride you have for your craft! I am a novice but learning and taking things slowly.... I was wanting to make my own crucibles just like yours so I am so happy to see it can be done! Cheers!

Absolutely incredible, sheer talent and professional workmanship, straight to the point, down to earth and easy to understand.

Ingenious method. Thanks for sharing and providing a decent and highly informative video.

This video was mad 8 years ago, has anyone tried it and please post links to any videos with improvements. Thank you good sir you will go down in history as one of the best backyard engineers. Always wondered how crucibles were made.

Thank you sir it is the best instruction I have seen on KZread for this method

Very good video. Very informative. Thank you for the detailed information you provide with the formula.

Thank you for sharing it! Great work!

the sound of this alone is brilliant I could listen to hours of peaceful relaxing workshop sounds serious, love it :D

Beautiful piece of work!

This is great! Very informative and nicely done.

Well thought through and presented and a rather unique subject. All thumbs up!

I don't think I can properly express how valuable your video is, Sir. I have to try it on my own! From what I see, a meat grinder should come in handy for homogenizing the mix. If you ever test it, please post what the results are. Many thanks for your work, Sir! You're doing us a great favor!

Definitely coming back to this to craft my own crucible!

So informative. Thank you.

The food channel has really improved. All kidding aside this is amazing and inspirational.

Really nice looking crucible.

Great video. Thank you!

what ratios of the ingredients would you recommend for making silver and gold molds with good chemical resistance and long life longevity?

Fantastic safety measures with the fire suit!

finished product looking good.

brilliant work dood! im currently into induction melting and making graphite crucibles is of huge interest. cheers fella

brother you looked a little shaky at first, but you are the safest and one of the smartest casters on youtube period. i think your work is excellent, that same starbide crucible would cost 200 plus bucks..a spectacular job, i am very impressed, and i'm not easily impressed kudos

thank you sir, i will pass on what you have shown me to my students

I'm looking to make a crucible to melt more-or-less pure quartz (silica). It melts around 1700°C. A pure graphite crucible melts around 3600°C so I think that'd work. But...do you have any idea if your graphite crucible mix could work up to around 1900° (I'd like a little temperature buffer to work with since I might have to run at 1800°C or so). I suspect since glass is a component in your mix it will cause your crucible to fail when the borosilicate melts, which is apparently 1648°C...although sometimes mixes have surprisingly different properties so maybe it could withstand higher temps? Have you ever tested it?

I like your ingenuity. I don't feel alone. Essayons

Is there any particular grit size you are using for the silicon carbide? I have some 150 grit and some 1200 grit any benefits to one grit over another?

Respect on your work sir

thank you for the video sir, could you please put where you get your supplies from, thank you

Its all new to me the method you are using and there may be strong reasons why you do. However i come from a ceramics background where we were slip casting. That is getting all dry clay ingredients adding to barrel of water making thick slip clay, adding deflockulent.which makes it appear thinner, more wattery. Then we added slip to dry/ semi dry plaster of paris molds. The benefit is there is definitely a higher success rate/ failures due to cracking. Dont know of this helps but just what i know

Just finished watching your segment on making a crucible and have a question. What type of graphite do you recommend and do you have a recommended source? Thanks in advance.

Ah thank you for making this i always wanted to make my own graphite crucible

Hi, glad to see someone else uses the wife's oven to make furnace parts. I also know what I can do with the 15 to 20 pounds of graphite powder I end up with after making molds every month. Great video, I'll give it a try but on a smaller scale.... Nice job

thanks for the information, I would really appreciate if I see a video of the new formula

@rlbob1 So just to check if I understood, one crucible for each kind of metal and this crucible is not the right one for steel? If not which one would you recommend?

The chair he is sitting in LOL Informative video.

good job you had a robot to help you at the end:)

Great job btw. if you can clarify some confusion for me on what type of fire clay to buy online i see fireclay cone 5 through 10 from what i understand the higher the number the higher the temperature is needed to cure the clay. is a cone 10 fire clay what im looking for or am i completely lost. second question how much clay will i need to make the crucible in your vid? and also in your propane foundry how much refractory did you use

would adding a metallic powder to the mix help at all with cracking? I suppose it'd have to be at a low ratio but I haven't ever been in a position to test it.

Great job!

Great Video, good to learn from a pro. I am olanning to make a crucible from your recipe, but I am unable to locate any borosilicate glass. Is it possible that sodium silicate can be used instead. Thanks

Good work! Where did you get the metal pipe with the reducer flange? You don,'t mention the different size pipes, tube's or dowel. This would be helpful. Thank you

Safety at all times cuts to clip of him handling molten metal on a wooden porch covered in leafs lmao love it

hello bob just writing to ask if you have been using your graphite crucible much and how it is holding up ? i would like to make a permanent mould using your recipie and would like to ask also where best to obtain the ingredients? any help or advise would be much apreciated looking forward to your reply jason

Dude awesome AWESOME video. Thank you so much for the exact recipe to make my own. I know it could get spendy buying them. Glad you taught us how to save money. I do assume we can save clay for later if we do want to make smaller ones?? or should i just cut the recipe in half?? just lil curious because i dont want to use a large one all the time.. Once again GREAT job on the video. Makes it easy for some ppl like me to follow along.

Just wondering , this particular ceramic u mention when you cast into it ,, does the metal stick,,, would it be usefull for a re-usable mold,, do you know of any such ceramic blend...?? thanks..

awesome video. great crucible. I want one as big as this. one question though, how expensive was this to make?

very nice work

What do you figure cost and all materials to make (just crucible) and what size is it in holding volume you would say?

Hi Bob, so 2 things I'm curious about. 1- you spoke of a new formula you had a few years ago. Has that worked better for you and would you care to share? 2- with these crucibles, once you do the slow process of bringing things up to temp for your first pour; do successive pours have to be slow as well? In other words my crucible is setting around for 2 weeks. Do I need to heat it up really slowly when I decide to do some casting or can I just ramp up my foundry furnace on waste oil like I normally do with a steel crucible?

Very informative, well set out video. Thanks very much. Where did you those great pouring tongs?

Thanks for the reply.

Thank you and I love you vidoes.

Nice video. Can you tell us what the O.D and I.D. dimension of the crucible is? Will you be making these for sale?

Thank you for sharing this, knowledge is power.

This gave me some ideas on what I need to do, I want to make a crucible that will accommodate the irregular shape of my furnace and not waste any space but concerned about the heat flow as well. I don't want to break down its efficiency so any suggestions would be appreciated as for the fire chamber coverage

Excellent videos on the foundry and crucible. Do you sell the crucibles? If not what are the dimensions of the crucible and where is a good place to purchase one? Thanks!

Nice TY! I would like to make one 2 meters cubed. Any suggestions other than what you have done? TY in advance.

Hi, do you have a list of the material sources ? Where would you purchase the material. Please be specific. Thanks John

lot of work appreciate the video

Great work

Follow up on the glass question do you have any suggestion on a supplier for the glass

Is the silicon carbide considered a glass? Is that why you did not say where to get it? I figure it is, I just want clarification. I do not want to mess up after spending time and money. I have got a cone chart and looked up the graphite. Thank you for your help. Can I use the graphite out of tv, transformers .... for anything or do you know?

I would also definitely purchase one if you sold them. Great video! Please let me know if I can purchase one from you.

well, I'm impressed.

Is it possible to use this crucible mixture to make a putty material to create a two part mold?

hi, thanks a lot for this video!!! with blacksmith friend we want to make wootz steel. do you think this type of crucible is ok ? have a good day ( sorry for my english )

wow, your pretty smart. I didn't think it would work. Thanx for help.

Is it possible to mould a coin into this graphite clay mix and produce a coin mold without needing to carve the coin in a solid graphite block?

GREAT JOB

I noticed when you were hand-mixing that you started kneading the stiff clay immediately after wetting it. When I want to "thin down" stiff clays a bit, I prefer to add the clay & a bit of water to an airtight container, then forget about it for a few days. Letting the water work its way into the clay on its own is far easier, and makes for a much less slimy experience, IMO.

The formulas and how to mix the clay was great. What you were doing after you made the rings was very obscure.

@anonynomnomnom

10 жыл бұрын

He was using a hydraulic jack to compress the rings with the collared steel tube he showed you in the beginning. @rlbob1, did you score the ring segments before setting them in the mold?

@scotts.2624

10 жыл бұрын

He didnt show how the mold goes together, or how it is oriented in the press. It's not clear or detailed how he packed the clay nor did it show what keeps the clay from just pushing out the bottom. How did he end up with a solid bottom if he is using a hollow ram with a flange? No information on that. How thick is the walls and bottom? Not a clue. At 10:24 you mostly see his back not a clue what he is doing there. At 10:34 he ducks down so who knows what he is doing there. All the camera shows is the same large tube with a hex flange. Whats the large tube with the hex flange for? Between 10:24 and 11:21 he shows nothing of what he is doing. Between the beginning up to 7:40 its a great video. Between 7:40 and 11:21 not so much. After 11:21 he shows what is going on again. Like most things in life you never get the full story from one source.

@rlbob1

10 жыл бұрын

Unfortunately the solid steel tubes did not allow much for camera angles so I had to rely on the storyboard in the beginning. Still I think I can answer most of your questions. The large tube with the hex flange is bolted to two 2*4's which straddle the concrete blocks and firmly hold the smaller tube and the core base in place. The large washer on the core base fits snugly against the end of the flared portion of the small tube and keeps the clay from pushing out the bottom. It also centers the core and forms a nice flair for the crucible top You recall the hollow ram also has a solid end as well as the washer end. After building the clay to the top of the core you flip it to the solid end and add another inch of clay for the solid bottom. The solid end is also used to force the crucible out of the mold after unbolting a board holding the core base in place. Just remembering it is being formed upside down with the flanged top facing down and the solid bottom up and that will help visualization.

Great video thank for the information!! Where did you get the borasilicate glass and silicon carbide powder though?

@xanderrockneyfinger1

9 жыл бұрын

Kenneth Finger Yeah I had the same question about that one. More just the borosilicate glass. Would garnet granules be a suitable substitute?

@rlbob1

9 жыл бұрын

Kenneth Finger Silicon carbide look under abrasives usually available on eBay. Borasilicate glass is sold as glass frit. Look for the clear borasilicate variety. I obtained mine from crushing pyrex labware and filtering it. Hope this helps.

have you had a crucible break? currently i am using ss (probably 409) but i would like to try making brass or bronze for certain applications. also, i happen to live within two miles of a graphite manufacturing plant.

Will a clay graphite crucible work in a charcoal fueled furnace? I read somewhere that clay crucibles couldnt be used in certain types of furnaces. I am currently having someone weld a steel crucible for me to get started melting aluminum, but after seeing this video I want to also try my hand at making a clay graphite crucible since they last longer. I already have some ideas on a mold for the crucible that should work while still coming apart easily, I just need to know if it is safe to use one in a charcoal furnace first before I go to the trouble of making it. Also, The steel crucible I am having made for me is from 6 inch steel pipe with a quater inch wall thickness. Can you tell me about how many melts I could expect to get from it? I am only planning on melting aluminum. Any help is appreciated.

@robherch2312

9 жыл бұрын

Jon Coates A charcoal fired furnace will generally have a less oxygen-rich internal environment than his propane one. Assuming you aren't forcing in inordinate amounts of air (which you'll never need for melting aluminum), you should have little/no problem with burning the graphite out of a graphite-clay crucible. As far as a melt-count on your 1/4" wall thickness steel crucible, that will primarily depend on 2 things: #1: Steel Alloy..while something like, say, an M2 tool steel can withstand pretty much anything you can throw at it without lighting the aluminum on fire, some lower-temp grades of "mild" or "stainless" (or especially anything with a >2.5% carbon content, like "cast iron") steel could melt marginally close to your working temps & not last long at all. #2: Overheating...the closer you stay to the temperature where the aluminum "only just" melts, the longer your crucible (any crucible) will last. The more heat you use beyond what's necessary for your process, the faster you'll degrade the crucible. With that said, on average (assuming you used a decent steel & reasonable firing temps) you should get at least a couple hundred firings out of that thickness of a crucible I think.

His neighbors must call him "moon man"

did you find that your formulas is ok or did you come up with a better one .

Great video!

WOW goooooood nice Man >thank for you and Your kind assistant

I noticed that you made this in 2012. How has it held up and would you change anything if you made one now? I am contemplating making one with your recipe and a similar jig I would make on a shop press.

@rlbob1 absolutely genius of our time, I do have a question, what would be the cons of have a stainless steel reinforcement in the mixture, similar to the technique of reinforcing concrete, seeing as stainless steel melts at a temperature far greater than what a home foundry could ever produce?

hi, thanks for a very interesting video. Could you tell me what temperature or orton cone you are firing the crucible to after drying. Trying various stoneware clays myself but have not tried to incorporate graphite yet.

@kylemccullen4417

3 жыл бұрын

Start low and slowly (generally 8hrs)work your way up to your operating temperature that you plan to use

Good information. Thx.

been thinking about having a reasonably tall kiln and cruisible combo where i can put in a complete cilinderhead (unbroken with valves springs everything still in it ) i seen it done once but the guy used a verry large burner putting the flame staight in the opening against the aluminium inside a steel barrel layed down at an angle with the catchcan under a hole in the lowest point , verry crude and wastefull in the amount of energy used to melt it but it worked the dross basicly stuck to the barrels wall on the way down while the pure aluminium dropped further and out the hole like to try it with the kiln vertical and the burner as is normally placed and have a hole in the bottom of the cruisible sitting on a hole in the bottom of the kiln , the kiln sits higher off the ground then usual and the mould is placed under it (want to make clean aluminium ingots that can be remelted and cast the normal way ) my thought is basicly to not spend a lot of time pouring or even take out and handling a red hot crusible , taking out dross and all that but just have the aluminium leak out the bottom at the same speed as it melts off the head and keep adding scrap through a hole in the top and having moulten aluminium pour out the bottom any idea how to get the dross to seperate while the aluminium drops out ? will it stay in the crusible or block the pourhole ? if the dross comes with the aluminium leaking out i was thinking on a small gutter from the leakpoint down to the mould for the dross to stick to , but it might be too cold and have the aluminium solidfy before it enters the mould or just make a bigger mess of things

outstanding.

What type of metal are you pouring at the end of the video?

what size is the dimensional size of the crucible and what is the amount it holds , I won't be working with large amounts and wonder if it will be worth the effort and cost to make this

Hi big fan of your videos. I'm trying for the first time to make your Crucible. I was wondering I found graphite that it's purified and at 99.9% graphite. Would that work with your receipt? Thanks

is it critical if i dont use de silicon carbide? i have all the other materials but i cant find the silicon carbide in powder form

Hey Bob, Your videos are very professional and I am learning much from you. I am having trouble locating borosilicate glass. Will you name a supplier or two? Also, which grit of silicon carbide is best? Thank you, Kenn

@bahramsafaei6465

2 жыл бұрын

تشکر سوالی دارم😘👏