At 05:22 PM 9/16/2004 -0400, you wrote:
>Actually, it's more like 0 psi  or 0 bar or whatever unit you prefer.
>You could get a better effect for forming your workpiece by using 
>compressed air pushing instead of sucking on the other side.

This level of vacuum (not very high) is usually specified in units of
gauge pressure- referenced to atmospheric- not absolute pressure. That's
why several of us gave the same answer of ~15psi, and that's also what's
meant when vacuum is given as "inches of water". 0" is no vacuum (atmospheric),
not a perfect vacuum. Same with inches of mercury.

When you start talking about relatively high vacuums, it gets reversed and
we start using units referring to absolute pressure such as torr or
microns (of an atmosphere). But that's not the level of vacuum used in this
kind of device.

>That would be blowmolding instead of vacuumforming

Blowmolding is cool. Nothing really sounds like that. Back when it was
high-tech I did work on parison controllers.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com




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