Supporting > Casting

Very interesting sand molding method.

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airmodel:
If you think that you have good sand molding skills watch this video and try this method.
http://www.youtube.com/watch?v=LqJlKLDUJLI

CI:
That's some trick molding there.
Amazing what they use to do with greensand.
.

CI:
An example of how the above type of intricate molding was used to make engine, look at the Soule Speedy Twin steam engine passage molding.
I was surprised at how intricate the cores and patterns were/are for a Soule Speedy Twin.
I am pretty sure they used greensand molds with linseed oil cores.
Lots of chaplets to secure the cores, and you can see the surface of some of the chaplets if you look closely at the exterior of the engine where the passages are located.

Fascinating engine because the steam chests at each side are not pressurized like a typical steam engine, although I think they do see some momentary pressure when the engine is reversed.
The pressurized steam chest is on the top of the engine, and it contains the reversing valve, which is a simple manually operated D-valve.
The valve is like three D-valves connected.
Two eccentrics, with no reversing gear, but totally and quickly reversible.

Edit:
The actual passages have rounded edges/corners, not square as I model them.
.

vtsteam:
I like it a lot @airmodel , not only for the skill involved, but I think the finished product is really handsome -- at least to me. Ought to be in a museum somewhere.

I'd like to try it, with little chance of not spoiling the mold a number of times -- question is, how many times before I give up? You have to have very steady hands for a lot of it, maybe steadier than I have. Then there's the problem of how hard the various greensand cores get compacted. And then there's the pour. And then...

Luckily my casting area is presently snowed in and way too cold to work at, so I have an excuse not to even try!

vtsteam:
The two worst parts, for me at least, would be removing the ball with tweezers without dropping, and hanging the handle's greensand core with gaggers. How does he do that? -- The only way you can come in on it with the nail is though the end. But those ends are blocked by the flask sand.

I guess you could dig away a small section, then nail into the other side, and re-fill. Not shown, but that's all I can figure. That particular greensand core must have a lot of binder in it to hang together after removal, replacement, and pinning. I'd add a little more clay for it alone.

You also want to pick a cup with a mostly cylindrical handle hole, beefy squarish handle and a mostly conical cup shape (all of which his has) to make it a little more do-able.

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