kelvin2164
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- Joined
- May 10, 2014
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I do my own castings for my 5" gauge locomotive and most things work ok. But I'm having a lot of trouble with the cylinders. Quite a large lump of bronze. 4" long with a 1 3/4" bore. I used a 1 1/4" core for the bore. The first one turned out great, but the second one had a large depression inside the bore, pulling up into a big section of bronze that forms the base for the steam chest. Too deep to machine out.
I used a piece of 3/4" steel bar inside the core to help the bore of the casting to cool first. Seemed to work on the first cylinder, why not the second one. Am I pouring too hot? I have a thermocouple that will read to 1,000C if required.
I've attached a pic of the cylinder sawn in half.
I used a piece of 3/4" steel bar inside the core to help the bore of the casting to cool first. Seemed to work on the first cylinder, why not the second one. Am I pouring too hot? I have a thermocouple that will read to 1,000C if required.
I've attached a pic of the cylinder sawn in half.