Vacuum veneer pump

[jj]

I have some veneer projects in the queue that will need the services of a vacuum pump. I'm not really interesting in building one. What are some mfgs to look at. Any suggestions?

Thanks in advance.

[Art Greenberg]

[Teamcasa]

Check around auto repair shops. Many have older R12 vacuum pumps they no longer use. I picked up two for $20.

Dave

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[jj]

Thank you for much for the info.

jj

[Leon]

[Pat Barber]

[Art Greenberg]

you give up, relative to the costlier systems, are (1) the pump runs continuously, and that noise might be a concern; (2) it is a small pump, and it will take a long time to pump down a large bag & fixture.

I wouldn't take the hand-operatoed version seriously for anything other than simple veneering of small work using PVA glue. Aside from the obvious difficulty pumping down a larger bag & fixture, the fact is that no system is entirely leak-free, so an application using a slow setting adhesive would mean you have to periodically pump down the bag.

I built my system using parts purchased from joewoodworker.com, and have a system with decent capacity (a 4x8 bag and large bending form is no problem) using a regulated pump for about the cost of the pump & bag from Woodcraft. The OP didn't say what his application is, but he did say that he didn't want to build.

[Leon]

Are you using the ventura system that runs off of a compressor?

[jimmy]

I have to disagree with this, at least related to some vacuum bags. My SO has that vacuum storage system you see on the Home Shopping network.

has a couple that have stayed fully 'vacuum packed' for over two years. Some leak some don't.

[Art Greenberg]

No, I'm using a vacuum pump. Photo of the assembled unit at

[Art Greenberg]

Hardly the same amount of vacuum used in a press. Much easier to keep a seal.

[Wes Stewart]

The pressure developed by the vacuum bag is the result of creating a pressure differential between the inside and outside of the bag.

The pressure outside the bag is ~14.7 lb/in^2 (psi) at standard temperature at sea level. The absolute maximum pressure the bag can develop is 14.7 psi regardless of how good the vacuum is inside the bag. Sucking harder can't make it better.

So if you have a partial vacuum that leaves a residual pressure inside the bag of 0.1 psi is this really a big deal? Is the veneer going to lay flatter with an additional 0.1 psi?

And is it really that much easier to keep the bag sealed against a differential of 14.6 psi than it is 14.65 psi?

[Art Greenberg]

Perhaps you misunderstood. My point is that the common storage bags, emptied by a household vacuum cleaner, do not achieve the level of vacuum as is employed in a veneer press (by at least a factor of 2 or 3), and at the lower inside/outside differential, it is easier to maintain that partial vacuum.

[no(SPAM)vasys]

Gast Rotary Vane

E-Bay or ping Bill Noble over at "rec.crafts.woodturning. Bill normally has a few used ones for sale. His web site is:

[Robatoy]

Seems to me, that she really *is* into all things vacuum, hence her relationship with you.

[jimmy]

It pretty easy to see why the group has gone for a complete shit.

[Robatoy]

Yea, right. Now you're trying to take the high road. Fat chance, f****it.

[Upscale]

Of course, the real irony is if the rec has gone to shit, he's one of the contributors to it being so.

[jimmy]

No high road here. I'm down in the gutter with shit heads like you. :) But I'm not the one who turned this group into a toilet. It's losers like you and the other circle jerking trolls who did that. Congratulations d*****ad.

[jimmy]

ROTFLMAO! Great post. How perfectly clueless.