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This is Memos Salisvourakis, i don't remember what's the date 16 or 17/4/2013
The making of a mold, where's my mold...There it is
Olympiakos sign(Greek football team) for Mrs Litsa
We'll show how it's made and printed on the casting sand
That's fine casting sand that i just have sifted
I'll put some sand in my mold
With casting sand
I'll press it a little bit
It's very important to press well on the corners
Like Mr Vassilis (Fountry Prof.) has said
That's just beautiful
Now i'll put in the sand that i sifted 1 minute ago
This sand will give us all the detail of the product
If we want we can sift some more of course
Sift...
Sand...
And sifting...
Very nice
That's more than enough
We take our foam model
We place it gently in the center
We press it where we should to create a layer
Because the foam models i make is a bit elastic
Thus there is the danger of coming out of the sand distorded
A bit like this, a bit like that...
Like they just had a major stroke...what the hell...
A little sifted sand on top is nice
And then, when we're through with the sifting
That is going to give detail to our mold,as we said before
We put some more sand
I must find the sinkholes, i must not pressure them now
Or else i blew it
How many did i have 5 or 6?
I think that that's them, nice
Let's put some sand around them
A little bit more in the corners
Now i have this wood but i have made a pressure tool
But i an bored to go fetch it
Now it needs a good pressing
I press around the model to build the peripheral mold and keep it in
There is the other sinkhole!
And now we move slowly to the center
I took this wood to press between the sinkholes, that is a little harder...
Now we'll do something else, what are we going to do?we'll put some more sand
We want to keep the sinkholes in the surface
The sinkholes MUST be in the surface
The sinkholes of course is where the hot metal is going in the mold
We'll show it in another video
I'll see, maybe i'll make 5 or 6 different videos or i'll merge them into one
Here and here, so we'll press here...There are 6 sinkholes altogether
(Counting sinkholes)
Ok, very nice
From what i see the sand is very tightly pressed, the mold won't fail...
It will give me great detail
The only thing left to do is to raise around the sinkholes a layer of sand
Because i'll cast all the Aluminum at once
Or i need something to keep the casted metal
Like this one,no that's not big enough
So i will necessarily have to raise the layer around the sinkholes
What can we do?I've tried several times...
The foam casting method isn't like the model is not inside
sometimes the casting doesn's pass through the sinkholes
And of course the mold fails and the model is gone...
The mold fails, that's the worst and unfortunately with the foam casting
When you make a model, it is the only one that exists, there is no other similar
And there cannot be one of the same
Except if someone has a method of producing same foam models
I doubt that, how can it be done?
I built them up now,making little towers
So as to make a casting in the hole surface and go anywhere but not on the wood
I'll dig a little here and i'll see that they communicate
Normally i have special tools for that too
Vasilis Valopitas (Fountry Prof.) had told me to make a little spatula, i have it here...
I made that too
Sorry, battery low
The flow of the metal will follow the print on the sand like liquid
I have a big print on the bigest sinkhole
I'll curve out some to be connected
It's not very deep but it is small the part of the sand that connects them
I will avoid to overdo the curving, because the mold will fail
To tell the truth i'm in a harry because my father has gone to get something
And i wait for him to come back to cut the grass just outside
And i make this mold in a hurry
I normaly have special tools for everything,even for blowind the sand off the mold
That i am not going to go get now because i'm in a harry
Let's press it a little bit
And that was the creation of the mold
You saw it how it started and you saw it how it ended
With these sinkholes and ready for casting
We'll start the fountry now