Can't answer your question as well a most of the guys in this group.
Just wanted to say that I too grew up on C.L. Stong and 60's era Vacuum.
??? Me too.? I still have some stuff I bought from Frank Lee
including a couple of the little single-stage oil pumps, one unused.?
I've had a lot of fun with them.
I recently purchased on Ebay a good Turbo Pump and controller for
a crazy low price. I thought I might have to at least replace the
bearings, but, it revs up just fine.
Tom M.
Ed
--- In VacuumX@...,
"Vaughn Mcdowell" wrote:
>
> I am a baby boomer retired in my late 60's. When I was in high
school I was experimenting with refrigerator rotary pumps as described
by Strong in the Amateur Scientist articles. As a senior in high school
I learned to blow Pyrex glass; during college in undergraduate and
graduate I worked with vacuums systems but mostly for building Argon
ion and N2 lasers. I did some diffusion pump work but very briefly. I
remember using gum rubber tubing, stop cock valves, and Pyrex glass
tube connections. Afterward I haven't touched vacuum systems until 2003
( fired up my diffusion pump) but very briefly; and recently much more.
I have always had a love for vacuum systems. But my vacuum world has
changed significantly with quick disconnect etc. I feel like Rip Van..
Having limited funding I looked to Ebay for getting components that I
could afford. I have been slowly acquiring KF fittings for future use.
In the meantime I am using what I know to get by with. "Procedures in
Experimental Physics " Strong has been my Bible. I have acquired more
recent Varian training manuals; info from Bell Jar; etc.
>
> When I was in College McLeod gauges were used for reference; now I
have very limited vacuum references; the gas discharge method; the TC
gauge and Ion gauge method. The first method is very dangerous in the
10 micron and below:
>
> I have abandoned this method; in the future I have some high
voltage experiments in mind:
.
>
> The TC gauge is limited but I am mainly interested in some ball
park idea; I have purchased several DV-6M types new and used; I can
used the hysteresis factory data to get some reference but how do I
know if is new that some oil back streaming hasn't changed or shifted
the thermodynamic continuity flow equilibrium much less the non linear
characteristics? When I started testing my diffusion pumps the TC
controller would quickly peg below zero; I started zeroing my TC
controllers using the diffusion pumps. At the moment I feel like I am
working in the dark. Even if I were to use a calibrated TC gauge; how
do I know mechanical and diffusion pump back streaming won't
significantly affect its thermodynamics significantly??
>
> Thanks
>
