OT! Air compression, reply off-list

[Please reply to me off list]

I apologise for this being off topic but I noticed a couple of you guys seemed to understand what is required for a pump to achieve the high pressures of a water jet table and some where interested in the idea of machining a pump out. I am interested in how a high pressure air compressor differs from a standard one you see on car spray guns etc. The type I mean are the ones used for recompressing scuba air tanks. They achieve a pressure up to around 3kpsi and I was wondering if there's a tiny possibility I could machine such a 'lower' (compared to water jet) pump head out myself.

I have been offered the opportunity to go scuba diving with some of my metal working amigos from work but the gear is expensive and I'd like to be able to recharge my own cylinders. If you like, this is a CNC project more than problem as it'd probably go on some CNC machinery, like me lathe.

So, is it possible? What do the pumps look like inside? Do you have any reference I could look at? It's got to be cheaper than buying them. They're about £4k new and they aren't running at the monster pressures a water jet table does.

Please reply off-list,
John H.
johnhe-uk@...


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