I see that mistake so often that I just automatically think inches Hg.
Any decent vacuum pump should be able to reach 25 to 28" Hg in a really
well sealed bag but a perfect seal is very hard to get. While
laminating plywood requires as much vacuum as you can get most glass
bagging is done below 15" so pump volume is usually a lot more important
than ultimate pressure.

hugh wrote:

"William R. Watt" wrote in message
...

There is a website describing how to use a discarded 'fridge compressor
for vacuum bagging. The fellow who tried it used a vaccum gauge from an
automobile in his configuration and claims he got 25 psi vacuum for his
project. He just used standard plumbing fittings to connect the vacuum

bag.



hahaha.. good one. he claims he got 25 psi vacuum.....

do not pass go, do not collect $200. go to jail.

hugh

p.s. my old engineering profs would fail you the whole year for saying
somthing like that in any individual exam....



--
Glenn Ashmore

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