To see how the pump works, look at the drawing below. The pump consists of a small diameter pipe called the piston inserted into a larger diameter pipe called the cylinder. The drawing shows the pump at two points during its operation. The top drawing shows air being drawn into the pipe by pulling out the piston.
The bottom drawing shows air exiting the pipe when the piston is pushed back in. At the right end of the pipe is a commercially bought one-way valve. This valve lets air into the pipe, but will not let air out of the pipe. At the end of the piston is a home-made one-way valve. The home-made one-way valve is made using a rubber "O" ring that slides up or down on the piston.
A hole is drilled into the piston, and two "stops" are attached, so the "O" ring cannot slide past them. When the piston is being pushed into the cylinder, the "O" ring slides back, letting the air in the cylinder exit through the drilled hole, and out through the hollow piston. When the piston is pulled out of the cylinder, the "O" ring slides towards the stop at the end of the piston, and blocks the air from getting to the drilled hole.
The right end of the piston is closed off the pipe is sealed. The left end is open, to let the air escape. This will all become easier to understand as you see the parts go together in the photos below. The first step is to make the piston.
We start by adding the stops that keep the "O" ring from sliding. Using liberal amounts of PVC cement, we glue the stops onto the piston, compressing them into place with rubber bands. Here you see we have drilled three holes, spaced at roughly equal distances around the pipe.
The photo below shows several simple steps all completed. The commercial one-way valve has been cemented onto the 1 inch cylinder pipe. Make sure that the arrow on the valve is pointing towards the cylinder. A short length of 1 inch pipe is cemented into the other end of the commercial one-way valve, and some reducing fittings are cemented to that so that we end up with a hose barb at the end.
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Find these syringes at most drug stores. Pick the kind that doesn't have a needle coming out. Look for hot knives at craft stores or home improvement stores. Burn a hole in the side of the syringe. Change the tip on the hot knife to the round tip that's the same size as your valves.
Plug the knife in to heat up. Gently pull the plunger back on the syringe about 1 inch 2. When the knife is hot, plunge it into the side of the syringe, making a hole in the space you've created by moving the plunger. The exact spot doesn't matter, but place it closer to the tip edge of the syringe than the plunger end. Screw the valve into the hole you've just made. Unscrew the black cap off the top of the valve. Turn the threaded part of the valve into the hole.
Keep turning it to the right clockwise until the valve is as far as it will go in the hole. You'll still have the top part of the valve sticking out of the syringe. The length doesn't need to be exact. After you cut it, wedge it onto the tip of the syringe so it fits over it tightly. Press the non-threaded side of another valve into the tubing.
Push it in as far as it will go. It will eventually hit the lip, and when it does, stop there. You may need to use pliers to help work the valve into the tubing. You can test both options to see which works best for you. Attach tubing to the threaded end of the valve. Use any length of tubing but make sure it's long enough to reach your pressure chamber.
Once it's threaded onto the tubing, attach it to a valve on your pressure chamber to complete the pump. Seal the edges with silicone gel or superglue. To use the vacuum, start with the plunger of the syringe nearly all the way in and then pull it out to the end of the syringe to create a vacuum.
Method 2. Take the top part of the bicycle pump off. Typically, you'll just need to find the screws holding it in place. In fact, it may only have 1 screw. Use a screwdriver to take the screw out, then pull the inside parts of the pump out so you can see them.
Turn the packing around the piston rod to the opposite side. When you open the bicycle pump, the rod is on the inside so as soon as you pull the parts out, you'll see it. When you pull out the rod, you should see a small disc on the other end.
That's what makes the vacuum in the tube. However, instead of blowing air, you need to pull it. The packing should make a u-shape facing down when you pull it out.
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