This sounds like he is trying to use vacuum to pull a parabola on a sheet ..... for that to work you will need a very sensitive feedback loop that is constantly checking on temperature, local atmospheric pressure, pressure of the vacuum line, and some kind of surface profile feedback.? I tried all that a long time ago and it was just to insense for my DIY skill set.? ? As far as making a vacuum regulator, you will need to tie in something like a piriani meter or a thermocouple meter to a feedback loop that controls a calibrated leak of some kind.? The trick is that it is all temperature dependant and everything will be changing all the time.?? Drew in sunny FLA?? On Mon, Jul 27, 2020 at 1:50 PM Jacques Savard <jacquessavard@...> wrote:
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