pitts_pilot(at)bellsouth.
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 Posted: Fri Mar 02, 2007 12:15 pm Post subject: vacuum stuff .... |
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Phil Sisson wrote:
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Many people are starting to realize the problems associated with the plastic couplings and are replacing it every two years. The guys who are doing this are getting a lot of trouble free time from the dry pumps. The problem seems to be the life of the coupling is getting pushed too far The vanes are designed to go a long time, and in industrial applications, they do, unless they ingest something like foam from an aged out filter. …
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This comment triggered an old memory. In the electronic test industry, they use vacuum to suck the boards down on the test fixture pins. The pumps were wearing out really fast, and the vanes and down time were getting significant ..... and as the pump efficiency dropped, so did the pass rate on the boards. Late one afternoon I found the problem ... purely by chance. The test tech was cleaning up the fixture area ... yup, you guessed it .... with the vacuum hose for the fixtures. The coarse particle filter was sealed so we never saw the big chunks, but the little grit ate the vanes up real quick.
Linn
do not archive
[quote]
Maybe a $11 coupling every couple of years or so, along with a new garter filter, may save a lot of grief and money..
Just an opinion,
Phil
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