Heathkid wrote:
Sounds like the parts of a "salvaged" SEM would be a good start for a
project such as this (assuming the diffusion pump is included - I've
been looking for one for a while but it seems the pumps are almost
*always* missing). But still, if you could find one locally (freight is
$$$) there are a lot of very good, high precision parts just begging to
be "hacked".
I haven't checked recently, but used/rebuilt diff pumps used to be
really, really cheap (because everyone using them in a process situation
was going to turbos, etc.). Sure, you might wind up buying a whole
pallet load of them, and half would be gunked up with some weird toxic
carbonized slime, but those you just pitch. Some of the others would
have a heater that's broken, but you cannibalize off another one. They
have the virtue of simplicity..
I've always thought that it might not be that hard to hack a turbo
pump.. I used to see the pump heads are readily available for cheap,
it's the 3 phase inverter/motor drive that's expensive, but with modern
VFDs maybe something could be hacked. (yes, it's a different set of
problems than a diff pump.. choose your poison?)
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