I suspected that might be the case. I saw a demo of a vacuum bag for
veneering and from a distance, it looked a bit like a pcl connector
betwixt bag and pipe off to the pump.
I'll have to set something up and try it.
IIRC the basic seal is just an O ring and should work either way. A
company I went to see once proudly proclaimed their vacuum degassing of
mould material was done at 2 atmospheres, I didn't have the heart to
tell the guy that was bollocks, 1 atmosphere maximum.
They aren't too far away from the design of genuine vacuum connectors
although lacking an o ring won't help. There are some other designs
of quick release pressure connectors (Euro?) that do have o rings that
ought to work. I can see your motivation as the genuine article is
bloody expensive to buy new.
Those bags can sometimes be used but a vacuum cleaner is useless as it
cannot run for hours on end as it needed with veneering/laminating glues.
I need a long open time adhesive whilst the lay-up is assembled.
I have been given some push fit pneumatic connectors (SMC?) to work with
6mm od polypropylene tubing. I've got a little vacuum pump now
that will run continuously at -600mm Hg. All I need is some play time to
try it all out. Should give about 11-12 lbs per sq in pressure on the
workpiece (sorry about mixed units).
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