Gallery, Projects and General > Project Logs
Twin Cylinder Steam Engine
Darren:
John, you mention using Cast Iron for the block if running on steam.
Can I ask why wouldn't brass be appropriate, or other metals for that matter :scratch:
Darren:
Hi Ron,
I would say go for it, but then I've no idea what I've got into here :lol:
Deep end comes to mind :ddb:
bogstandard:
Darren,
The standard materials for steam cylinders on models are cast iron, bronze and brass in that order.
They all have good wear resistance and are stable when subjected to heating.
In small engines, if you use standard steels, including silver steel, they will go rusty and jam up in no time under the hot humid atmosphere when running on steam, hence stainless should be used for shafts if possible. Model locos usually get away with it because most bits are easy to get to and can be kept well oiled.
Hot steam will cut through ali under certain conditions plus also it has large expansion rates. So that really must be avoided.
That is why I asked Ron if he was running on air.
If you are running on air, almost anything goes as long as you keep it well lubricated.
Hope that explains it OK.
John
sbwhart:
--- Quote from: ozzie46 on April 10, 2009, 06:59:10 AM ---
I'm in the process of gathering material for this engine as well. I will be trying to make it on my 7 x 12 lathe and drill/mill. So I will be following your thread with great interest and anticipation.
Great start by the way.
Ron
--- End quote ---
Hi Ron I'm shure you'll enjoy this engine build I've seen Johns engines and they do make a very nice project, and when you break it down into easy step as John has done its well within the scope of a newcommer: if you get stuck ther's plenty of chaps on her who will give good advice, but the most important thing is for you to have fun with the build.
Cheers
Stew
Darren:
Thanks John, that was well explained.
One more question, I understand than Stainless steel galls in a sliding motion. Do I take it that it's not suitable for cranskshafts in these models or can we get away with it?
Sorry, a second one...
If used for a piston rod do you put say a bronze bush in or again can we get away with it.
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