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From: Larry Craig (lcraig@concentric.net)
Date: Wed 25 Nov 1998 - 03:03:47 GMT
This is all bull shit Earnie. I have seeb you wrap your lips around the
tube and suck like hell.
<p><p><p><p>-----Original Message-----
From: Earnest Bertram <spinmicro@compuserve.com>
To: Denis Paul <Denis_Paul@tvo.org>; 14list <14list@i14.org>
Date: Tuesday, November 24, 1998 8:04 AM
Subject: Re: Vacume
<p>>Denis ;
>
>Not sure what your comment meant but I have used a air compressor for my
>vacuum pump for the last 8 years. I have built a total of 7 vacuum bagged
>boats using this process. With a reasonable seal you can pull around 20
>inch's of vacuum, more than enough for a vacuum bag. For many of the air
>compressors the conversion is easy, just disconnect the interface between
>the compressor and the tank. If you are lucky enough to have a pipe thread
>inlet filter the suction side is easy. If you do not than you can do what
>I did on my first conversion, where I cut a piece of plastic plate to fit
>over the inlet hole and attached a pipe fitting to it. Because the
>compressor is running in a suction mode there is little heat generated, and
>vac seal can be used to seal the adapter to the compressor inlet.
>
>To make the initial drawdown easier, connect a T fitting to the suction
>tube, put a plastic 1 #189# " lawn valve on the fitting and connect your
shop
>vac to it. The shop vac will pull down around 2 lbs but at lots of volume,
>good for that initial effort at sealing the bag. Once the bag is tight,
>shut the valve and use the air compressor to draw the bag tight. The only
>problem to be aware of is before you start make sure the oil level in the
>air compressor is full as you will, if your compressor is as old as mine,
>blow out a little oil. . Do not worry about the oil haze that seems to
>fill the room. The problem is that the vapor pressure of motor oil is not
>high enough to prevent it. In a real vacuum pump a special oil ( $30
>/quart) is used. A $1 worth of motor oil seems a lot better Idea.
>
>
>Ernie Bertram
>
>Head BOZO at BOZO boat works
>
>
>
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