Electronics > Mechanical & Automation Engineering

Putting vacuums in series (pneumatics)

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TimFox:
No.  Have you ever pumped a vacuum?

Capernicus:
I never have, hence my simple and confused questions.
I havent even pumped a car tyre before in my whole life.

TimFox:
Your mechanical methods work to produce a “partial vacuum” which can be adequate for a vacuum actuator, but still have measurable absolute pressure.
Practical vacuum actuators in automobiles use a negative pressure that is only a small fraction of atmospheric pressure to get a usable force on a sealed diaphragm, avoiding sliding seals.

langwadt:

--- Quote from: TimFox on July 06, 2021, 10:47:47 pm ---How do you obtain zero pressure?  Even in my extreme example in a pumped laboratory chamber with no sliding seals, there is a small pressure.  You can’t say it is negligible if you insist on mile-long extension.  Some estimates of the pressure in interplanetary space are better than my lab, roughly 10-16 atm, but the distances are also very large.

--- End quote ---

still the change is very small, 1atm - 0 vs. 1atm - ~0

Capernicus:
What the hell I'm going to do an experiment.



I'm going to resin print it and see if when I pull the left piston out to just inside,  the right one is harder to pull out or not.

Then I can finally put it to rest - and move on.

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