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.
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!
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
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.
This video really made me appreciate the other guy that I watched do this on TH-cam 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
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.
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!
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?
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.
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 ♥
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 ?
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.
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.
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.
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.
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
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.
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.
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.
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.
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.
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?
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.
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.
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!!!
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.
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.
@@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.
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".
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.
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.
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 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.
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.
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.
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
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
It's not overdone, it's quality-assured and thorough!
It’s been awhile.. have you glazed any yet. Is there a vid . Love to see that . Great work.
Very interesting! Will be my next job to cast cylinders for my Gold Star....
BRAVO Jimmy, the best on TH-cam
he goes so long without drinking his coffee...absolutely amazing!
If I left my coffee so close to the mold sure as rain I'd have clay in it in no time : )
Thomas White MATE HE IS ENGLISH IT’s TEA!
@@tomharrell1954 what ever he's drinking I bet that clay is tasty
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.
😅😅
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!
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
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.
ok
This video really made me appreciate the other guy that I watched do this on TH-cam 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
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.
Thank you for the video. What is the difference between grog and fire clay?
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!
Thenk you for sharing your knowledge!
Can I know the second article what is a heater and thank you 🌹
Very cool!
Of all the uses for Vaseline, this is my second favorite.
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?
@ivan schafeldt Thanks
What is the time in the oven and what it the time on firing and at what Temp. Please.
when making these crucibles is it okay to have sugar in your coffee?
Probably tea for him
What material do you mix with graphite to make it wet?
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.
Problem then is that you could get some settling if it is rough enough, so you’d need to get the water just right
@@1495978707 then get it just right, one try at it should give an indication of how much to use.
How many degrees of Celsius does it heat and what metals is suitable for melting?
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 ♥
I don't know. What do you want to achieve with the coal dust powder?
What oil do you mix with graphite?
4:00 Wondering if some of that mixture fell into the cup a tea 🍵 🤔....
How many degrees celcius can this crucible withstand?
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 ?
Apakah anda punya channel youtube yg lain? Tentang teknik
th-cam.com/video/s6ZmDY5Vma8/w-d-xo.html
Hi, excuse me i don't understand you mix 50% fire clay and the other product is ? Thank you
How do you crush the fire bricks to sand size?
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.
You can buy it from ebay if you don't want to make it, like I did.
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.
What temperature Can it resist?
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.
Hi sir.. Where's can i get the fire clay?
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.
Where can I buy fireClay? I can't find it anywhere.
Could you pls leave a link so I can reproduce this crucible
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
Grog i have is from fire bricks that i have smashed
'Graphite pencil as composit will it work to make graphite crucible mold
can you use these crucibles for melting at 2500F for iron?
Sorry I've not tried them for that. Copper brass and aluminum is my limit so far.
You would need to replace grog with graphite for casting steel.
@@luciusirving5926 The graphite will leach into the steel leaving you w/ cast iron, I should think.
If possible, the recipe makes the crucible, thank you, brother
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.
OK, just built one. Hope it works....
What is grog ?
Can you do a video showing what shape the crucibles are in now?
Yes I've got a couple available.
@@JimmyCogg thank you look forward to seeing it
@@khawk7365 No problem I've just uploaded a view of them. Hope it helps you.
That was a very cold cup of tea ☕️
Bahan bahan yg di perlukan apa saja? Trimakasih
keramik atau batu bata non-glasir yang dihancurkan halus dan tanah liat api yang dibasahi sedikit dengan air.
can i order this crucible from u?im from Malaysia..
That's very kind but these are rough hand made crucibles. I don't make them commercially.
oo..alright sir...tq
I wonder if he over does do doo too
Can I use a regular concrete mix. I need to withstand max temps to melt steel
I would say definitely not. Cement is not refractory. It will burn out at steel temperatures.
sir...can i know where can i get grog..
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.
@@JimmyCogg
oo..ok sir..tq so much..
@@amarmasz1216You can also use old pottery.
@@hardcase1659 thanks sir for information.. Im appreciate that
thank you
Sir what's the recipe for the mold itself not the crucible?
thank you Jimmy :)
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.
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.
Jimmy Cogg pretty sure he meant "fire clay" 😃
This info is useful. Thanks!
That garage looks familar! Is that coffee or tea?
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.
I made three, one after each other and didn't think about that. Your suggestion is brilliant. I like it.
Hey not let it harden in the mold?
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.
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?
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.
Che materiale hai usato? Sabbia? Cemento? 🤔
Grog (mattone ceramico (senza smalto) ridotto in polvere) + Fire Clay 50/50 in peso, il tutto impastato e poi inumidito (inumidito) con poca acqua
When you purchased the grog on ebay, what did you type in to search for, I can't seem to find any. Thanks
Try this...... www.ebay.co.uk/itm/402249638777?hash=item5da7f26379:g:ZCMAAOSwgy1eqztj
But it is quite expensive for what it is......try searching along these parameters.
hey do you think you can recycle old crucible material to make grog?
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.
Hi,, what temp and duration for firing please??
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!!!
Thanks man, helpful!
can you please give and other word fro grog ? I wasnt able to get it translated to my language .
crushed unglazed pottery or brick used as an additive in plaster or clay. I hope that helps.
@@JimmyCogg Thank you sir ! You know not english is my native langugage so sometimes i need to use translator . But now its cristal clear ! :)
@@druszan17 You are very welcome. My pleasure.
can i use cement instead of fire clay?
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.
No! But if you have to replace clay, then use sodium silicate.
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 ?
What is crog
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.
Would bentonite clay work?
Use sodium silicate if you need to replace clay.
can't find firebrick in my area, can i substitute it?
can can you melt steel? with this
I would suggest old crushed clay bricks. Basically a dense already fired heavy clay brick.
@@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.
@@JimmyCogg i wonder what they are made from back in the day to do crucible steel, thanks for the info sir!
what is grog.
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".
@@JimmyCogg well thanks best of luck in your projects Alleluia. God bless USA.
i took a shortcut and taped a portable massager to a stick 3:17
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.
No, it would melt during firing and make it weak at high temperatures.
you should've played "unchained melody" in the background
Water use percentage
I seen a big chunk of clay fly into your beverage 😆
what a grog?
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.
@@JimmyCogg Yes Mr J.C thanks too much..
whats grog
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.
@@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?
@@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.
@@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
:) 4:05 I'll name that tune in three Bob.
Hi what grog
Grog is crushed firebrick. From dust to 1mm sized particles.
Why not cut the sound during ff and narrate more details on your great instructions. Best so far it is.
I thought grog was an alcoholic beverage.
Ha ha....it's all for me grog.....me jolly, jolly grog.....
@@JimmyCogg I'll admit I had to look it up.
@@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
@@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.
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.
Better to over do than to do over
WHAT THE HELL IS GROGG I GREW UP KNOWING AS SOMETHING TO DRINK
LIKE A BOTTLE OF GROGG
Grogg is the stuff you wipe from your eyes when getting up in the morning.
Fire clay
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.
@@JimmyCogg thank you again.
Good now teach us, how to make "fire clay"
Try this! www.traditionaloven.com/articles/101/what-is-fire-clay-and-where-to-get-it
you have no experience or experience in the foundry
Spot on. Any help you can offer is very welcome. Cheers.
Deal with the fast forward music it's costing u views
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
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
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