Author Topic: A complete casting how to  (Read 10220 times)

Offline Bezalel

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Re: A complete casting how to
« Reply #15 on: April 07, 2014, 04:43:05 AM »
wood sealer
used for filling open grain timber

Queensland - wet one day, humid the next

Offline Tjark

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Re: A complete casting how to
« Reply #16 on: April 07, 2014, 06:57:03 PM »
Had some time today to make a couple of pourís.
Have made some pictures off the process.
First I had to fire up the furnace.
I use charcoal as fuel.
The temperature I can control with the fan speed.
I use a cast iron pot for melting.
This will not dissolve  in the aluminum, steel pots will dissolve, polluting the aluminum with iron.

Hope that the pictures speak for them self, if not I hope I can answer the questions .

  Tjark.


Offline ths

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Re: A complete casting how to
« Reply #17 on: April 08, 2014, 10:48:48 AM »
That came out well, looks good. Any problems to report?

Hugh.

Offline Tjark

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Re: A complete casting how to
« Reply #18 on: April 08, 2014, 10:17:00 PM »
The only thing what went wrong is one mold where I did not compress the sand enough.
This carb body was quit rough on the outside.
This one ended up in the furnace to got meld for the fourth carb body.
So I ended up with three carb bodyís for this day.

    Tjark.

Offline RMO

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Re: A complete casting how to
« Reply #19 on: April 09, 2014, 03:59:21 AM »
Nice work Tjark, I will be asking questions when I get my foundry set up.  You make it look easy.

Mike :praise2:

Offline Tjark

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Re: A complete casting how to
« Reply #20 on: April 09, 2014, 09:01:00 AM »
Mike,  Itís not that difficult if you have a furnace,  molding sand and good scrap aluminum you can make a start.
I had some help from a guy who sellís casting equipment to casting firms just after the financial crises.
I had send mails to a lot off those firms before and  never got a reaction.
So the financial crises has not all bad things to offer.
Green sand recipeís you can find on the net.
You can make this type off molding sand at home.
This is a water based sand.
I have two barrels off green sand where I made a start with.
Later on I have bought 300Kg off petrobond sand.
If you do not have that big castings you can use the original parts as pattern and make a start from there.

    Tjark.

Offline Zephyrin

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Re: A complete casting how to
« Reply #21 on: April 09, 2014, 10:56:25 AM »
It looks so easy to do while reading...
Thanks for posting this thead, a clear and positive view, really the kind of nudge which helps to have a go.



Offline nick

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Re: A complete casting how to
« Reply #22 on: July 23, 2014, 07:52:27 AM »
Is the furnace made from a gas bottle? Are there any instructions about for making one? :) :)
Who I am is best not discussed, for I have been many things in my time.....

Offline Tjark

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Re: A complete casting how to
« Reply #23 on: July 23, 2014, 02:47:14 PM »
Nick, there are a lot off plans on the internet.
If you are serious thinking to build a melting oven  you can find some books with a good drawings and description how to.
Mine is built from a liquid gas tank and an old car ventilator who I can regulate in fan speed to control the temperature off the meld.
I have chosen for a charcoal melting furnace for the following reasons,
A gas fired oven produces moister when burning charcoal not.
An oil burner takes   a lot off space what I not have.
Maybe itís not the best choice but I am very happy with it.
I did not build it, I bought it from someone who was casting for many years and did switch to a electric furnace.
Also you have to think about the metals you will be melting.

       Tjark.

Offline mhirst121

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Re: A complete casting how to
« Reply #24 on: July 23, 2014, 06:22:53 PM »
Thanks for the write up Tjark. I have just finished my furnace and have just done my first melt with it, it is a liquid propane bottle lined with furnace material and fired with a 1 1/4" propane burner. Now I just have to make up some patterns and obtain some green sand so I can really get things going.
May be back to ask some questions when I get round to this part!!

Cheers,
MartinH
Carlisle, Cumbria, UK
A creative mess is better than idle tidyness !!

Offline Tjark

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Re: A complete casting how to
« Reply #25 on: July 23, 2014, 08:01:29 PM »
Martin, your first meld must be a great feeling.
Mine was anyway.
When you have questions please put them here, when I can I will answer them.
Otherwise there will be a lot of people with more knowledge then I have and are be willing to respond I think.
Wish you a lot off success with the pattern making and first casting.

    Tjark.