Making clay and grog crucibles for melting metal

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Making clay and grog crucibles for melting metal

Рет қаралды 147,715

Күн бұрын

This is how I make crucibles for metal casting. 50/50 w/w grog (crushed fire brick) to fire clay with the barest minimum of water to make the mixture adhere together so that it can be compacted into a mold. Once fired they are very strong. ....and are as cheap as chips!.

Пікірлер: 162

@user-ug5sb6qg1u Ай бұрын

Of all the uses for Vaseline, this is my second favorite.

@jeremykiahsobyk102 3 жыл бұрын

It's not overdone, it's quality-assured and thorough!

@9traktor 3 жыл бұрын

Very interesting! Will be my next job to cast cylinders for my Gold Star....

@thomaswhite4609 5 жыл бұрын

he goes so long without drinking his coffee...absolutely amazing!

@bohorustica8545 5 жыл бұрын

If I left my coffee so close to the mold sure as rain I'd have clay in it in no time : )

@tomharrell1954 4 жыл бұрын

Thomas White MATE HE IS ENGLISH IT’s TEA!

@bowlweevil4161 3 жыл бұрын

@@tomharrell1954 what ever he's drinking I bet that clay is tasty

@branni6538 2 жыл бұрын

This is great! My pottery skills aren't great but I can mek a pot to boil water. This technique will save me doing the sausage coiling carry on. Thanks! I can't wait to try it and boil a brew in it!

@nicholecrouch311 4 жыл бұрын

I like the way you made that mix one thing my boyfriend is trying to make a crucible that can withstand the Heat enough to melt copper with and brass and all those higher temperature Metals than aluminum and he ran across this video and he said he learned a good mix from you and also that he needs to keep his drink way further away then you have your cup of coffee in the video LOL he said whenever you started ramming it in you would more than likely have half a cup clay grogg in the bottom of the cup he doesn't have a mold like you do but he plans on making one soon because that makes it a lot simpler to turn out a few crucibles like that liked the video

@wazzazone 2 жыл бұрын

BRAVO Jimmy, the best on KZfaq

@ryanwassle4824 3 жыл бұрын

This video really made me appreciate the other guy that I watched do this on KZfaq it only took him 10 seconds to form a Crucible in a mold if you haven't seen the video just imagine building the template in a completely opposite fashion to this one

@1495978707 Жыл бұрын

2:15 The reason for the grog is to reduce shrinkage and cracking. Grog particles are larger and already fired, so they don’t contract when fired again.

@sageosagie8390 4 жыл бұрын

Good job, absolutely amazing. I love mold pattern & will like to try my hands on it. I have successfully made crucible to melt brass fired two to three times with great success, I used natural modeling clay with pulverized charcoal.

@dominicjulius3108 Жыл бұрын

@expatconn7242 2 жыл бұрын

It’s been awhile.. have you glazed any yet. Is there a vid . Love to see that . Great work.

@tomharrell1954 4 жыл бұрын

Jimmy Jimmy Jimmy oh mate I got to know how does the tea taste with the grog? I am just kidding mate. You’re doing a hell of job! I love the crucibles! I am going to give it a go! Thanks for posting! If you weren’t so far in England I am sure you would be a great mate to lift a pint or two.

@jonathangofast559 3 жыл бұрын

The glaze is borax , relatively inexpensive and can be applied after the first furnace treatment, then it can be brought back up to temp around 1000 degrees celsius for the glaze to melt ..thanks for sharing this method, i learned something

@bobbyfulks4614 3 жыл бұрын

Do you wait for The Crucible to cool down before you apply the borax? And then heat it back up to a 1000 degrees Celsius

@jonathangofast559 3 жыл бұрын

It's best applied to a hot crucible so it sticks to the walls and won't pool at the bottom, borax needs a high temperature to glaze, to get it to stick only needs roughly 400 degrees Celsius

@TheMattjudo26 4 жыл бұрын

Very cool!

@itanc1 3 жыл бұрын

nice work dood! i have one in the oven as we speak, trying to make them for and induction furnace melting iron. i used a cast 2 part ali mold for the outside and a nylon plug for the core. i found your channel hlaf way through my build but would maybe have copied you if i had seen it a day earlier. big up the home melters!

@__austrianoldboy_9861 Жыл бұрын

Thenk you for sharing your knowledge!

@steviesuperstar Жыл бұрын

You can put locator dowls in the box to instead of keep screwing it down each time. Once it's screwed up turn it over drill 2 or 1 hole down each side and glue a dowl in the bottom bit. Then make the mixture a little more watery and pour in the top. Take longer to set and dry but none of that ramming with a stick.

@1495978707 Жыл бұрын

Problem then is that you could get some settling if it is rough enough, so you’d need to get the water just right

@STEVETHEBARBER Жыл бұрын

@@1495978707 then get it just right, one try at it should give an indication of how much to use.

@klausschwabshubris 4 жыл бұрын

That was a very cold cup of tea ☕️

@peterxyz3541 3 жыл бұрын

This info is useful. Thanks!

@malcolmmutambanengwe3453 3 жыл бұрын

thank you Jimmy :)

@Dyshof 2 жыл бұрын

Thanks man, helpful!

@gizish 5 жыл бұрын

Nice video! Very informative! I have a couple of questions. 1. How long do you wait for them to dry before the first firing? 2. How long do you heat them at 250 celcius?

@tomekokej 3 жыл бұрын

@ivan schafeldt Thanks

@merdaslian9606 5 жыл бұрын

How many degrees of Celsius does it heat and what metals is suitable for melting?

@hiRafia 3 жыл бұрын

If possible, the recipe makes the crucible, thank you, brother

@JimmyCogg 3 жыл бұрын

It is in the intro This is how I make crucibles for metal casting. 50/50 w/w grog (crushed fire brick) to fire clay with the barest minimum of water to make the mixture adhere. Also in the video 1.55 minutes onwards.

@baltazarmush8843 2 ай бұрын

Thank you for the video. What is the difference between grog and fire clay?

@kayateknik9328 3 жыл бұрын

Apakah anda punya channel youtube yg lain? Tentang teknik

@JimmyCogg 3 жыл бұрын

kzfaq.info/get/bejne/qZyKoKeKmrzRkWw.html

@Michael-vp4zt 4 жыл бұрын

when making these crucibles is it okay to have sugar in your coffee?

@fredbecker607 3 жыл бұрын

Probably tea for him

@user-wx8rw4qe5f 11 ай бұрын

Can I know the second article what is a heater and thank you 🌹

@gpetheri 2 жыл бұрын

OK, just built one. Hope it works....

@nesabrdza6548 5 жыл бұрын

Hello :) Thanks for your video,he is very instructive ♥ I have a question, what would happen if you went into that mixture, for example, added 1kg coal dust powder + 1kg grog + 1kg fire clay and mix with water ? Best regards from Serbia ♥

@JimmyCogg 5 жыл бұрын

I don't know. What do you want to achieve with the coal dust powder?

@CaptainRadack Жыл бұрын

What is the time in the oven and what it the time on firing and at what Temp. Please.

@almotafail1 3 ай бұрын

What material do you mix with graphite to make it wet?

@AndrewBuchen 4 жыл бұрын

Just wondering if the box were hinged would it be easier to pack the mixture more tightly with the lid open? At least to the point where you cap it off.

@joeblowjohnny2297 3 жыл бұрын

Mr. Jimmy , has the cog mixture been holding up very good for steel melting ? Any crack yet ? How many burn time you average with this mixture of crucible before replacing it ?

@jeffery19677 4 жыл бұрын

Why not loosen the inner form and let it sit That would let it cure more slowly and you wouldn't get deformation when you removed it from the mold.

@JimmyCogg 4 жыл бұрын

I made three, one after each other and didn't think about that. Your suggestion is brilliant. I like it.

@MartinusBoekhorst 2 жыл бұрын

4:00 Wondering if some of that mixture fell into the cup a tea 🍵 🤔....

@thefrenchfoundryman7724 Жыл бұрын

Hi, excuse me i don't understand you mix 50% fire clay and the other product is ? Thank you

@almotafail1 3 ай бұрын

What oil do you mix with graphite?

@wisteria4360 2 жыл бұрын

How many degrees celcius can this crucible withstand?

@moonolyth 3 жыл бұрын

I used to belong to a forum on this subject and the reading became long and complicated. Now you say these will last up to 5 uses for bronze Wow. That is good to hear. Do you think anything more could be added to give them a longer life? graphite perhaps.

@lincolnhantsbarger3306 3 жыл бұрын

Just a suggestion but you know the part where you firmed up the top rim.....just a thought but why dont you put the clay in from that side initially then put the peghole plate on and flip it to do your final pack from the bottom side and to make sure it comes out even????? Again just a thought might save some time.

@TimLee356 4 жыл бұрын

you should've played "unchained melody" in the background

@davejackson6929 4 жыл бұрын

:) 4:05 I'll name that tune in three Bob.

@name6440 4 жыл бұрын

'Graphite pencil as composit will it work to make graphite crucible mold

@khawk7365 5 жыл бұрын

So how did it turn out? Did it do okay to melt aluminum? How many cast have you had with it? And what fire lay did you use? I was thinking about making my Hot face of my furnace this way.

@JimmyCogg 5 жыл бұрын

The crucibles turn out well. I've only done 5 or six melts with these (one litre capacity) and I use them for brass, which is hotter. No problem with Aluminium. Not sure what you mean by "Fire Lay". The furnace I use is oil fired.

@elektrobear2027 4 жыл бұрын

Jimmy Cogg pretty sure he meant "fire clay" 😃

@amarmasz1216 4 жыл бұрын

Hi sir.. Where's can i get the fire clay?

@turlesfy399 2 жыл бұрын

Where can I buy fireClay? I can't find it anywhere. Could you pls leave a link so I can reproduce this crucible

@Richardson501 4 жыл бұрын

How do you crush the fire bricks to sand size?

@JimmyCogg 4 жыл бұрын

It's work, but at it's basic a decent hammer with the firebrick against a form of an anvil, a large stone, piece of steel etc. You will get particle sizes from dust to whatever size you want. Wear eye protection and gloves. Don't breathe the dust and have some kind of method for collection, such as spreading a cloth out.

@JimmyCogg 4 жыл бұрын

You can buy it from ebay if you don't want to make it, like I did.

@nurofenaddict5905 2 жыл бұрын

i took a shortcut and taped a portable massager to a stick 3:17

@evansquartz4268 3 жыл бұрын

Sir what's the recipe for the mold itself not the crucible?

@jovanceharambasa 2 жыл бұрын

Sir i have made a forge last days and now i'm trying to protect air pipe from high temp, but i dont have fire clay, can i do it with 1 part grog, 1 part cement, 1 part hydrated lime and 3 part sand that is recept i found online, i now cement is not suitible for fire what do you think about that recept

@jovanceharambasa 2 жыл бұрын

Grog i have is from fire bricks that i have smashed

@hayatel2557 Жыл бұрын

What temperature Can it resist?

@khawk7365 5 жыл бұрын

Can you do a video showing what shape the crucibles are in now?

@JimmyCogg 5 жыл бұрын

Yes I've got a couple available.

@khawk7365 5 жыл бұрын

@@JimmyCogg thank you look forward to seeing it

@JimmyCogg 5 жыл бұрын

@@khawk7365 No problem I've just uploaded a view of them. Hope it helps you.

@richardf.dossii3900 5 жыл бұрын

So a crucable made like this would be fine for copper,brass, aluminum, silver, gold and small amounts of iron? As for fire brick..that's just common red brick..yes?

@JimmyCogg 5 жыл бұрын

Copper, brass, aluminum I have used them for all these. Iron I understand is possible but I have not melted iron nor precious metals such as silver or gold. Fire brick is a dense ie heavy, fired brick ie it has already been cooked and is refractory, (fire resisting) in a furnace.

@gonova8412 4 жыл бұрын

Can I use a regular concrete mix. I need to withstand max temps to melt steel

@JimmyCogg 4 жыл бұрын

I would say definitely not. Cement is not refractory. It will burn out at steel temperatures.

@blackfordoblique1965 3 жыл бұрын

I wonder if he over does do doo too

@bradley200711 3 жыл бұрын

can you use these crucibles for melting at 2500F for iron?

@JimmyCogg 3 жыл бұрын

Sorry I've not tried them for that. Copper brass and aluminum is my limit so far.

@luciusirving5926 3 жыл бұрын

You would need to replace grog with graphite for casting steel.

@nunyabidniz2868 2 жыл бұрын

@@luciusirving5926 The graphite will leach into the steel leaving you w/ cast iron, I should think.

@kayateknik9328 3 жыл бұрын

Bahan bahan yg di perlukan apa saja? Trimakasih

@JimmyCogg 3 жыл бұрын

keramik atau batu bata non-glasir yang dihancurkan halus dan tanah liat api yang dibasahi sedikit dengan air.

@ShaileshYadav-pc1jg 2 жыл бұрын

What is grog ?

@mrlikwid100 3 жыл бұрын

That garage looks familar! Is that coffee or tea?

@curtcoker6359 2 жыл бұрын

Better to over do than to do over

@pedroernestobraga 5 жыл бұрын

same question from outhers, I think use this to make my frunance fire wall (hot face) U think these can work well for these purpose ?

@blackfordoblique1965 3 жыл бұрын

Why not cut the sound during ff and narrate more details on your great instructions. Best so far it is.

@BurgardPottery 3 жыл бұрын

When you purchased the grog on ebay, what did you type in to search for, I can't seem to find any. Thanks

@JimmyCogg 3 жыл бұрын

Try this...... www.ebay.co.uk/itm/402249638777?hash=item5da7f26379:g:ZCMAAOSwgy1eqztj

@JimmyCogg 3 жыл бұрын

But it is quite expensive for what it is......try searching along these parameters.

@amarmasz1216 4 жыл бұрын

can i order this crucible from u?im from Malaysia..

@JimmyCogg 4 жыл бұрын

That's very kind but these are rough hand made crucibles. I don't make them commercially.

@amarmasz1216 4 жыл бұрын

oo..alright sir...tq

@carlosmehicano8052 4 жыл бұрын

hey do you think you can recycle old crucible material to make grog?

@JimmyCogg 4 жыл бұрын

I would say that it is probably contaminated with metal. It might have absorbed metal/material which will expand and contract at different rates and cause weaknesses. Crushing bricks or other high temperature fired material is probably a better bet.

@Cristian-kv2up 2 жыл бұрын

Che materiale hai usato? Sabbia? Cemento? 🤔

@JimmyCogg 2 жыл бұрын

Grog (mattone ceramico (senza smalto) ridotto in polvere) + Fire Clay 50/50 in peso, il tutto impastato e poi inumidito (inumidito) con poca acqua

@noahd8673 3 жыл бұрын

Hey not let it harden in the mold?

@JimmyCogg 3 жыл бұрын

No, you don't want to let the crucible harden and bond to the mold. if it hardens in the mold it may be difficult to separate from the mold without catastrophic damage. Get it out while it is still soft. It is delicate, but you can then dry it and then fire it to make it stable.

@akansara3881 4 жыл бұрын

Water use percentage

@amarmasz1216 4 жыл бұрын

sir...can i know where can i get grog..

@JimmyCogg 4 жыл бұрын

Grog is crushed refractory brick, ie dense clay that has already been fired. So if you can find a hard heavy brick and crush it down to a sand like and powder consistency you have grog.

@amarmasz1216 4 жыл бұрын

@@JimmyCogg oo..ok sir..tq so much..

@hardcase1659 4 жыл бұрын

@@amarmasz1216You can also use old pottery.

@amarmasz1216 4 жыл бұрын

@@hardcase1659 thanks sir for information.. Im appreciate that

@dominicjulius3108 Жыл бұрын

thank you

@mobmob5944 Жыл бұрын

I seen a big chunk of clay fly into your beverage 😆

@marmac567 3 жыл бұрын

Hi,, what temp and duration for firing please??

@alfonzograzadaushka3470 2 жыл бұрын

Slow and steady wins the race!!! Too quick on the way up, or on the way down, increases the failure rate...Thermal expansion is the villain, The grog has allready been fired, and offsets the properties of the clay to minimize thermal shock....As for how High??? Way High, higher than you would ever need to go!!!

@druszan17 3 жыл бұрын

can you please give and other word fro grog ? I wasnt able to get it translated to my language .

@JimmyCogg 3 жыл бұрын

crushed unglazed pottery or brick used as an additive in plaster or clay. I hope that helps.

@druszan17 3 жыл бұрын

@@JimmyCogg Thank you sir ! You know not english is my native langugage so sometimes i need to use translator . But now its cristal clear ! :)

@JimmyCogg 3 жыл бұрын

@@druszan17 You are very welcome. My pleasure.

@arthurn9237 3 жыл бұрын

WHAT THE HELL IS GROGG I GREW UP KNOWING AS SOMETHING TO DRINK LIKE A BOTTLE OF GROGG

@moonolyth 3 жыл бұрын

Grogg is the stuff you wipe from your eyes when getting up in the morning.

@pieking66 5 жыл бұрын

NICE JOB, would a handfull of chopped glass fibre in the dry mix add to the strength of the finished crucible I wonder? would appreciate your thoughts.

@court2379 Жыл бұрын

No, it would melt during firing and make it weak at high temperatures.

@turlesfy399 3 жыл бұрын

can i use cement instead of fire clay?

@JimmyCogg 3 жыл бұрын

No, sorry but the high temperature of the furnace will just burn out the cement. I would imagine that the crucible would just fall apart. The fire clay is used because it is relatively stable at higher temperatures.

@luciusirving5926 3 жыл бұрын

No! But if you have to replace clay, then use sodium silicate.

@cliffschiller4159 3 жыл бұрын

What is crog

@JimmyCogg 3 жыл бұрын

Grog - Crushed unglazed pottery or brick used as an additive in plaster or clay. It is clay that has already been fired and then crushed up. Being fired it is a refractory material, relatively stable under high temperatures. I hope that helps.

@elektrobear2027 4 жыл бұрын

Would bentonite clay work?

@luciusirving5926 3 жыл бұрын

Use sodium silicate if you need to replace clay.

@NKG416 5 жыл бұрын

can't find firebrick in my area, can i substitute it?

@NKG416 5 жыл бұрын

can can you melt steel? with this

@JimmyCogg 5 жыл бұрын

I would suggest old crushed clay bricks. Basically a dense already fired heavy clay brick.

@JimmyCogg 5 жыл бұрын

@@NKG416I've not tried it. I believe steel is a higher temperature than iron. The crucible needs to be made of a refractory material that will stand that sort of temperature.

@NKG416 5 жыл бұрын

@@JimmyCogg i wonder what they are made from back in the day to do crucible steel, thanks for the info sir!

@omvalmiki401 3 жыл бұрын

what is grog.

@JimmyCogg 3 жыл бұрын

Grog is powdered refractory material. For example clay or clay bricks that have already been fired in a kiln or furnace and crushed down to a powder. The result is "grog". It is relatively inert and stable at high temperatures as it has already been "fired".

@omvalmiki401 3 жыл бұрын

@@JimmyCogg well thanks best of luck in your projects Alleluia. God bless USA.

@ak74headshottaa73 2 жыл бұрын

No offense my guy but this looks like the slowest way possible lol i geel yhe quality would be like a value cast piston to where clay spun on a wheel would be a forged.

@ericthered9655 3 жыл бұрын

I thought grog was an alcoholic beverage.

@JimmyCogg 3 жыл бұрын

Ha ha....it's all for me grog.....me jolly, jolly grog.....

@ericthered9655 3 жыл бұрын

@@JimmyCogg I'll admit I had to look it up.

@patmcdowell6430 3 жыл бұрын

@@JimmyCogg I see you spent all your tin with the lassies drinking gin are you taking up sailing as well if you do I like to see your videos

@JimmyCogg 3 жыл бұрын

@@patmcdowell6430 No sailing really, but now and again I get the opportunity to go out on a boat. I just like singing the good old Irish tunes.

@hossamslime9354 5 жыл бұрын

Hi what grog

@JimmyCogg 5 жыл бұрын

Grog is crushed firebrick. From dust to 1mm sized particles.

@jamieclark7221 5 жыл бұрын

whats grog

@JimmyCogg 5 жыл бұрын

Hi Jamie. Grog is crushed firebrick. From dust to 1mm sized particles. Basically it is already fired clay/pottery/brick which has been pulverised. You can get it from a pottery supplier or ebay. As it is dense and already fired it is relatively thermally stable from an expansion and contraction point of view. The clay you mix it with acts as a binder or glue, then it is refired in the crucible shape. Hope that helps.

@marcinrzepa4945 5 жыл бұрын

@@JimmyCogg well, I'm sure that's will help me, thx man this is all I was look for. One question tho, it has to be heated before first use?

@JimmyCogg 5 жыл бұрын

@@marcinrzepa4945 yes it has to be fired. It is heated up slowly and then taken to a very high heat for quite a while and then cooled down slowly. I heat them in my domestic oven to the highest it will go about 250 degrees C then take them out and put them in my furnace and take them up to metal melting temperature to fire them. When they are cool again, they ring like a bell when tapped.

@marcinrzepa4945 5 жыл бұрын

@@JimmyCogg thx man that's very helpful. I will give it a try in a few days ane see if I can manage this, thanks a lot

@khawk7365 5 жыл бұрын

Fire clay

@JimmyCogg 5 жыл бұрын

It is just fire clay. It is a high temperature firing clay. It is used for chimneys in the UK and is sold as "fire clay". A good potters supply should be able to direct you.

@khawk7365 5 жыл бұрын

@@JimmyCogg thank you again.