Vacuum Pumps........again.......

Charlie, thanks for all that info, I was ticking the points off as I read, the only one I did not do was the pen trick for circles, good tip :thumb:

I did post about my vacuum cleaner attempt here......

Sort of sucks <- link

I think the log and the short of it is I need a better shop vac :D

Cheers!
 
Geez I'm stupid :doh:

10-4 = 0.0001 right?

man these pumps are REALLY low pressure, what gives? :dunno:

View attachment 11352

that means 5x10-4 is the same as 5 x 0.0001

Right? :huh: :dunno:

So 0.0001 x 5 = 0.0005 Torr or 0.00001969" of Hg........??????

Man I can pull more vacuum with a straw in my gob..

OK, I'm REALLY confused here, what would you need a pump that pulls so little vacuum for?

Something is out of whack here..............

Actually Stu, thats a pretty high vacuum. The mixer chamber in the receiver at the radio telescope I worked for was at something like 10^-6 Torr and about 4.5 K. That pump probably has a tiny flow though so it wouldn't work for your purposes anyway - but I'm late here, so you probably had ruled it out anyway. Vacuum is a hard concept to get your head around, at least for me, but I do remember that vacuum to pressure is not a direct conversion, even when using mmHg.
 
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