|Review by vipond33||posted 04-29-2013 03:00 AM||4413 views||11 times favorited||20 comments|
To begin: If space is a vacuum, who changes the bag? Hmm?
Back to earth.
We use a vacuum bag extensively at our shop. Everything goes in it;
veneered panels & torsion box assemblies
solid layups and curved work pressings of course.
Recently, our old bag had had the bun. Full of difficult to patch holes, it was a mess. A new one though, was going to run us $550 from our original supplier. You have to pause at that expense, grimace a bit and patch a few more times.
Then, frustrated and cruising the net one day I ran across veneer supplies.com. Besides providing an amazing array of veneers and supplies, they also offered a Build A Bag system for a reasonable cost. What it was consisted of a seamless tube of 20 mil polyurethane plus the bag closures and a flush mount valve stem. A 5’ x 12’ bag for us ran only $185. Hell, let’s get two.
Much smaller ones are available for the home shop.
One and a half days after ordering we got it shipped from Maryland across the border to Toronto! That’s fast. E-mails to the site were helpful and returned promptly. Read their about us to have a good idea of the fine US company here.
We ordered additional fittings to have dual air flow from our HI-Flow pump and were very pleased with the quality of these pieces. Solid brass and accurately machined.
The stretch factor compared to our old vinyl bag was outstanding. No more un-pressurized ridges on top (so important with veneer) and it also being a glue releasing surface.
Because it was so clean and new we had to put in a chain to the corner of the work most times because the bag would self seal around it and provide no pressure. That’ll change as it gets dirty.
If you’re new to this clamping method, they also provide low cost venturi or oil-less pumps to make up a complete system. For a bag replacement or entry into the world of vacuum pressing I heartily recommend this company and their products.
It’s all good now, yet it seems that some guys in the shop are still not perfectly clear on the concept.
Don’t remind me of the lovely bits of sawdust on the lens. Phff.
-- firstname.lastname@example.org : dovetail free since '53, critiques always welcome.