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I'm in the UK, so engineers in the UK would be much better.

Cheers.

<t>Do any experienced engineers want to takeon a commission for <br/> machining pairs of ally piston and brass cylinder pairs, either beta <br/> or gamma, not sure which yet. Highly polised for work without <br/> lubricant(?) and close fitting for working with Helium.<br/> <br/> My thinking is that ...

<t>I saw the answer in another of your posts john; Brass and ally. I am going to get it lathed, It is a prototype for evaluating a novel energy source. I don't want to worry about maintainence or build in a lubricant reservior.<br/> <br/> Now I've got to go in search of metal expansion or it will pi...

I am designing a twin cycinder engine which will have very poor
access opportunities. Can you recommend materials for a lightweight
displacer and a power piston which will not need lubriation.

Thanks.