Re: Caring and feeding an Edwards speedivac?

Nick Mueller wrote:

Hard to say wether water or oil. I
don't want to open the pump (if it can be avoided) and risk to ruin
gaskets that will be hard to get.

Partially answering myself:
Couldn't resist and opened it. No gaskets hurt. Damned imperial
spanners. :-) Thankfully a lot of allen heads (?) where I do have a set of.
Simple to disassemble.

Several reasons:
* The plate where a reed valve sits on is rusty. Fixed with an oil-stone.
* Crud and water in the case. The new oil is white now. Thankfully, I bought
2 liters (well, almost: two quarts) of the oil and one bottle is more than
enough. Almost cleaned.
* The vanes (it is a rotary pump) do have some wear and a little bit of
rust. I guess they will wear in again into the "cylinder" that also got a
bit rusty (not really rust). But, the length of the vanes is 0.06mm shorter
than the cylinder is high. So I *guess* they can't seal well on their
sides. I'll assemble it again tomorrow and if it doesn't get better, I'll
ask a friend to grind off 0.04mm (or so, if I only would know) of the
cylinder so the vanes fit again. I have something else to grind, so I can
send him two workpieces and some beer tokens.

Nothing tragic, can all be fixed. Good old solid British engineering!

And to the question why I need a speedivac for VPI: Well, the young lady I
got the oil from also asked me what a private person is doing with such a
pump. :-)) At least it isn't undersized.


Nick
--
The lowcost-DRO:
<http://www.yadro.de>
.

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