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Marquetry card table by John Linnell #3: Adventures in casting pt 2

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Blog entry by Longcase posted 04-28-2016 01:51 AM 594 reads 0 times favorited 2 comments Add to Favorites Watch
« Part 2: Adventures in casting pt 1 Part 3 of Marquetry card table by John Linnell series Part 4: Legs finished ( well almost) »

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.

Original

Thanks for looking
Keith

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
Keith



2 comments so far

View shipwright's profile

shipwright

7175 posts in 2266 days


#1 posted 04-28-2016 05:12 AM

I’m impressed. I made lots of patterns when I was building sailboats but I sent them out to a foundry. Is that actually you doing the casting? Where did you find the facility?

I had all my castings done in aluminium bronze and they came out very nicely. They were however sand cast and not as surface detailed as these. Very interesting and very fine work. Do you remember Globe Foundary in Richmond?

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees. http://thecanadianschooloffrenchmarquetry.com/

View fatman51's profile

fatman51

335 posts in 1305 days


#2 posted 04-28-2016 06:14 AM

Interesting and nice work. I am pleased to see someone keeping the arts pattern making and casting alive, especially on a small scale. In my father’s shop, we used to sand cast babbitt bearings. Occasionally he would do brass or bronze but he would usually farm those out to a local foundry. We would also build patterns for reservoir head gates to be cast out of iron, copper alloys, or nickel alloys. A number of years ago, we built a pattern for a pair of five foot by 8 foot head gates , which were sand cast locally out of a nickel alloy. A lot of pocket change went into those guys and they will be there when the reservoir is gone. I believe the ditch company is now using our pattern as the meeting table in their boardroom.

-- The Constitution only gives people the right to pursue happiness. You have to catch it yourself. Benjamin Franklin

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