Supporting > Casting

Steam engine cored passages attempt

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CI:
Here is my attempt to cast the passages in the face of one of the cylinder supports.
This core was not successful, but I think the process would be valid and usable if made and assembled correctly.
These are sodium silicate cores.

As it turns out, the passages on an oscillating steam engine can be machined directly into the face of the cylinder support, which is how the original green twin supports were made.
The passages do not have to be embedded in the castings, although there would be a bit less leakage if they were imbedded.

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CI:
The cored passaged for the green twin cylinder came very close to working correctly.
I believe that if I had used the Zip Stik (tm) core adhesive, that would have eliminated the gassing problem that ruined these iron castings.

You can see that the passage enters the bore in the counterbore area, which is why I was using a stepped bore core.

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CI:
Here is the simple straight core that I ended up using, with drilled passages.
The high points of the cope mold with resin-bound sand must be vented, because resin bound sand will trap air in the top of the cope mold, and cause large air bubbles in the casting.
I ruined two good base castings when I forgot to vent the tops of those molds.
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