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| raynerd:
Just a thought - every single year at the ME shows, I am blown away with the Sterling Engine stand and the chap from Cornwall always spends a long time talking to me. These are his engines: Although he has used graphite, he uses many highly polished aluminium pistons. He drills them out so thay are just a shell and then polishes to a perfect fit. He also uses many sterlings with diaphrams which is another option. I used graphite for mine but if I attempt another, I`ll use aluminium or a diaphram. Chris |
| slowcoach:
Thanks for taking the time to answer my questions guys, really appreciate it :beer: I never considered aluminium Chris, you got me thinking now :smart: I will let you know how it goes. Cheers Rob :thumbup: |
| raynerd:
Hi Rob Glad it helped. I used graphite in mine and of course it is nice but heavy and I didn`t enjoy machining it that much. The aluminium power pistons he makes are basically hollowed out bar to leave just a nice light shell and they are super polished to fit the precision glass tube he uses for the cylinder. He has anodised some at home (which is fairly easy to do!) but he assured me that anodising isn`t necessary. You can see in my picture that all the ringboms he has on display are using aluminium if not a diaphram. For what it is worth - he says that a diaphram is by far the best way to go... low fricition and dirt cheap to make! He told me he uses white latex from gloves. Chris |
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