Vacuums!

[Alex698]

Originally Posted by amos229

I was curious, is this as easy as reversing the pump to suck?

In my experience in custom airbrushing, due to the way the pumps move the air they dont create a substantial vacum on thier own. Idk about the first pumps but I know if i try using mine to suck it heats up fast.[/quote]

I would NOT recommend hooking your pumps in reverse, due to the fact they were never built to work that way. (otherwise there would not need to be a resona to color-code the wires )

[Thorcat]

If you look at the manufacturer's website, they say the the head is set up for compression only. Product Page

I would take this to mean that if you hooked something up to the suction side it would not create very much suction because the rubber piston seal would be useless.

[Dranyam]

Good idea! I wish i'd thought of it

[GUI]

The KOP compressor will not work as a vacuum pump, but it is not necessary when you have the KOP vacuum generator and suction cup. We tried picking up an inner tube with it, and it is more than enough to hold on to the tube.

[Tottanka]

the punp creates a lot of vaccum pretty fast as seen here:
http://www.frc-1947.com/Stuff/vacum1.avi
http://www.frc-1947.com/Stuff/vacum2.avi

[Jeremiah H]

Something we came up with, as an alternative (if we don't need the compressor onboard or just want to do something different) involved a piston, screw drive assembly, and a little motor.
The idea is that you rig up the end of the piston's rod to the nut of an acme thread (or KoP, whichever) screw drive and mount a small, fast motor to the screw. The piston is staged with the rod all the way in, with the nut at the extreme nearest point to the piston. Your vacuum line is connected to the piston at the opposite end from where the rod enters. The other end (nearest the rod) is left open to allow displaced air to escape.
When you want to produce a vacuum, all you need do is power that motor until it has driven/pulled the rod far enough to create the desired vacuum strength. You could reverse this idea and start with the piston all the way open and the vacuum line connected at the other fitting, then push the rod in until you have the desired strength. You also could push/pull the rod with a cable or lever or something else.
I think this is allowed, but I must admit that I haven't gotten too far in this year's manual yet.

[Biff]

Originally Posted by Alex698

In my experience in custom airbrushing, due to the way the pumps move the air they dont create a substantial vacum on thier own. Idk about the first pumps but I know if i try using mine to suck it heats up fast.
I would NOT recommend hooking your pumps in reverse, due to the fact they were never built to work that way. (otherwise there would not need to be a resona to color-code the wires )

They (the copresssors) make the same air pressure when wired backwards, (don't argue), the problem is the cooling fan runs the wrong way and the compressor will overheat early.

[Peter Matteson]

Originally Posted by Biff

They (the copresssors) make the same air pressure when wired backwards, (don't argue), the problem is the cooling fan runs the wrong way and the compressor will overheat early.

I forgot to mention the obvious for this earlier the compressor uses check valves in the head so even if you run the motor backwards its still a positive displacement pump.

[Jeff Rodriguez]

So, vaccums don't count as pnematics. That leads me to two questions. One, if you run pneumatic devices with a vaccum, will they just work in reverse?
Second, if they work, does that mean we can forgo the pneumatc rules and use whatever actuators we want?