if you can afford $200 for an AC pump, you can certainly get a "correct"
pump. I sell them (used) for less than that, and of course there are other
sources. If you want to use an AC pump, that's a choice you can make, but
don't use the cost of a new AC pump vs the cost of a vane pump as the
excuse. Look around for used vane pumps, or used oilless piston pumps.
Also, 30 minutes is not a long time - I've had my vac pump running for over
an hour on some pieces, maybe even 3 or 4 hours because you can use it to
hold the piece while you finish it. So, plan on continuous duty.

bill
www.wbnoble.com



wrote in message
oups.com...
They may be overkill, but they are very readily available. An
excellent A/C vacuum can pulls 5 CFM can be bought brand new and
delivered for less than two hundred dollars and have a full warranty.

I would love to have the "correct" vacuum, but availability and cost
are the biggest drawbacks on that. I am still not understanding how
much mist will be coming out of an A/C pump, and as has been pointed
out they surely wouldn't be used long or hard by A/C standards which
may use one of these for 30 minutes or easily more without turning it
off.

I am stunned to think it could blow out enough oil that I could even
think about recycling it from a large bucket. It will run for 5
minutes at a time and pull about 4-5 inches when I finish my once a
week bowl, not more.

So I still don't understand... will the shop (or me) be covered with
oil without an exhaust filter ?

Robert