<VV> Vacuous

[Padgett]

>I have been using my evolved and modified Frigidare
>refrigerator compressor for at least 20 years.  It will pull an indicated
>30 inches in about 30 seconds.

Makes sense is the "old style" GM. OTOH everyone seems to be pitching 
"microns" with 400 being the goal. Since that is about .019" of HG I don't 
think my gauges could measure that since is the difference between 29.90" 
and 29.92" (at sea level). In contrast the Harbor Freight 
#3952  "Venturi-type vacuum pump removes moisture from air conditioning 
systems so you safely add refrigerant. Easy to operate, just connect an air 
line and it pulls full vacuum within 2 minutes. Ideal for automotive air 
conditioners, home air conditioners, refrigerators, freezers, and more!" 
can pull clear down to nearly 39,200 microns (28.3"hg)

I have never tried to measure my vacuum pump made from the a 1/4 hp 
electric motor and the accessory pump from an Olds Diesel but it seems to 
work. Didn't know about "400 microns" when I built it, just let it run for 
about 20 minutes.

Padgett