@@WildBearFoot 12 hours

According to our experience, using two bellows allows to reach the temperature in less than 10 minutes. So yes, it is of primary importance

@@centomille1 Thank you very much, this is key knolage for me. I have one another question, aren't you pumping from one to the other one? Or are there any "one way doors" to prevent this problem, if it's problem?

@@renemulisak5401 there is no valve, it is just the air coming from one bellow that goes into the tuyère

Better waiting for the sun...

Arenaria calcarea

Hello! It depends on the dimension of the spearhead. It might be 700-1000 g. So, in case of this weight it would be around 70-100 g of tin. Better cooling slowly and then a bit of hammering

@@centomille1 Thank you, I appreciate it

Thanks for watching. Have good luck with your surveys!

Thanks for watching!u

about 10 minutes, pure copper

Tnq bro

Hi Lycurgus224. The sword is about 78 cm long and is made out of around 2 kg of 10% tin bronze. If you have any other question do not hesitate to ask!

Awesome! Out of curiosity, how long were you and your friend pumping the 4 bag bellows before the copper/tin was sufficiently melted? The tubes connecting the bellows to the trench forge, what were they made out of? And it looks like you buried the top of the crucible in charcoal, were you worried it would contaminate the mixture?

@@Lycurgus224 Yes, we pumperd for around 15 minutes. The tubes are made out of ceramic, and yes, the crucible was completely covered withe charcoal. It does not contaminate the metal: on the contrary, it is better, as it reduce oxidation

Silvano Angelini ciao! Sabbia fine calcarea bagnata

Silvano Angelini ciao! Sabbia fine calcarea bagnata

Ciao, grazie Dell immediata risposta! Riproverò con quest altro tipo di sabbia!

Sapresti indicarmi la marca, il costo e più o meno quanti sacchi ci vogliono per fare uno stampo come il tuo?

La sabbia è presa dal Po, presso un affioramento. Un sacco di qualche chilo è sufficiente, anche perché un po' ne va sempre persa. Più fine e pura è, meglio lavora.

Caro bedreico85, siamo molto interessati a fare questo tentativo insieme a te. Perché non ci contatti via mail, così possiamo trovare un modo per metterlo in atto insieme? puoi scrivere a [email protected]

Adigun Blackwater goo.gl/images/pBpC7s Some, similar to our replica, were actually found in Trentino, not so far to the sout from the iceman

Sgt Cortez not Vin Diesel Hi! If you use caolinitic clay -white in color- is fine. Other clays are less good over 800-900 degrees. Whatever clay add some grog/chamotte into that to make it more resistant (about 50% of the volume).

@@centomille1 where you find this clay.

​@@leonidasmiglioriniplaster ​ you can find it in a shop. Ask for a chaolinite clay. Very resistent

Hi Ro Bastard! Be careful about the copper. Sometimes it is not pure and it might have various percentages of Nickel, Zincum, etc. which can be difficult to melt properly with this kind of techniques. I would suggest to use a pure copper-tin alloy around 10% of tin. Best wishes for new castings

Hi Cole, this is sandstone but limestone could be good. Do not take river pebbles, because they are too hard. the best thing is to collect the stone from a proper outcrop

​@@Simonjose7258That's certainly best for unique intricate or unique pieces. On the other hand, stone molds make more sense if you're planning on a larger scale of production, like household tools or outfitting an army.

check the suggestions to the right. shawn woods has one up...how to make otzi the icemans copper axe or sumthin.

Bobbert Bobby what about grinding? Or u realli thought blades and iron works come out automatically polished?

I thought it looked wrong too. As bad of a casting as they ended up with, if they were to polish the imperfections out, they'd end up with nothing left. It is most certainly scrap.

coarse river pebble and coarse sand

Peter Wikvist. yes it is bronze 10% of tin

Thanks for your answer. Will the bronze chisel work on red sandstone as well?

Likely, it will work. I recommend sandstone must not be a river pebble (too hard).

hi! it is very fine calcareous sand

Claudio Cavazzuti That is a fine job, I was a bit disappointed that the video was a minute and a half long, it would have been much nicer to see the full process. I have subbed ^^

@Shona O'Neill kzbin.info/www/bejne/pF7akquFoMp9js0

+Deus0tiosus Never tried. The sand is quite soft, so maybe it could work.

Do not cast with polystyrene unless you want the possibility of gasious explosion, this is NOT aluminium! The pouring temperature is more than double of aluminium. If it didn't explode it would leave a nasty dirty specimen. If you are going to go to the trouble of making bronze then at least do it properly and make a carved wood blank to mold.

I don't think there would be risk of "explosion" or blowout. try it out and be safe

+xxrookiexx1 We perfectly know. We produce hundreds of these swords, those which will be refined are treated differently. These are just to show the casting process to the public and then we recycle them.

hi claudio, are you saying that to make the best sword the bronze should just be left to cool on its own slowly?

Yes..slower is the cooling, better is the resistance of the material

Claudio Cavazzuti Thanks! I was wondering because I saw a video where Neil Burridge quenches the mold then he hits the bronze piece and says "that's a very hard piece of bronze" which kind of confused me

If you mean the BBC video, I see. But we must always remind that many castings are only demonstrations for the public (open air museums, TV, etc.) . However, also in these cases, it is important to tell to the public that if you want to cast a functional sword, the cooling should be the slowest possible, in order to have the hardest material. It is also true that after the casting, we could harden the bronze through a series of heating and hammering. Hope to have answer to your doubts.

+Hashslingingslasher Read the description

+Hashslingingslasher Read the description

+Taff pls

Sorry, i don´t speak jive

Taff u jive turkey?

handmade by ourselves. It's very easy...using clay. same material for tuyères

Like regular pottery clay? If so, sweet!

Britten Clark It is kaolinitic clay, the most resistant one. You can also use illitic or montomorillonitic clays, which are more common but less resistant to heat. What really matters is to put a lot of chamotte in the clay (more or less 50% of the weight). If not, crucibles and tuyères will probably crack.

it's a fine calcareous sand from Po river...

Claudio Cavazzuti What are those pellets at 1:25 that you started out burning?

pussiestroker Those pieces are tin-bronze (10% tin).