Now the flasks are placed in the oven upside down and then heated up , first to 300 degrees F and held there for 2 hours so that the wax can run out of the flask.
The oven in now heated up to 1370 degrees F over a period of 6 hours and held there for 2 hours , this completely removes any residue of wax that may be left in the flask,the oven temperature is now lowered to 1100 degrees F and held there ready for pouring.
While the flasks are cooling down in the oven to 1100 F the bronze is heated up in the furnace to a temperature of 2100 degrees F, now we are ready to pour.
The flasks are removed from the oven and placed in the vacuum chamber ( The investment is porous and the vacuum will assist in the bronze flowing into every nook and cranny).
The crucible that contains the now molten silicon bronze is removed from the furnace and the slag ( which was very little) was skimmed off.
Now pour into the flask.
The flasks are allowed to cool for a while then dipped in water,the investment falls away from the bronze casting.
This was my second attempt in brass , I was not satified with brass ,so I went to silicon broze
My fourth attempt with bronze, better ( not perfect) I will need to do some chasing to make them acceptable for the table.
Thanks for looking
Paul, we should get together for a chin wag, If or when I get over to the island I wil drop you a line, alternatively if you get over to the mainland , drop on by.
Madburg, Thanks for the links, I had checked a few sites out in the UK ,but decided to have a go a casting before going else where. The hinges were bought locally at a place called ” The Source” they import some fabulous brass work in from England, and at a good price
Handsawgeek, I use a foot operated jig/ threadle saw for cutting my marquetry, I posted a picture of it in an earlier blog called Marquetry project.
All the best