 
PAGE 4 of 6  Testing the performance of the air tank and the compressor So, let's make a first test of the compressor. I really had absolutely no idea if the small air compressor would be enough to fill the container with air at 9 bars within a small time, because (as per specs) the pump can only work continuously 10 minutes MAX...
Better than expected! Indeed, much better than expected. I takes less than 3 minutes to get a pressure of 8 bars, so the small compressor operates way bellow its limits. The 6.6 amperes current is a very reasonable current to handle with a simple PSU, probably switching. Then, i made another final test to see how good the construction is sealed. Without removing the compressor, i measured how much pressure escapes form the tank: It took some 25 minutes for the pressure to drop from 8 to 6 bars. This is a rather poor performance. I am thinking of using a oneway valve between the tank and the small compressor, because i think that 99% of the loses comes from the poorly sealed compressor... Generally, i am very pleased with the results. What about the air capacity? (October 17 2012) In the first page of this project i did some calculations to see if the volume of the air in the tank is enough  but now things changed. The pressure range is now from 5 to 7 bars. To avoid doing the same calculations again, i made a dirty spreadsheet to do the calculations for me. Here it is:
Tweaking the calculator? (October 21 2012) The idea is that i will use a 3way (or 5way converted to 3way) pneumatic valve to actuate the piston. The purpose for the 3way is that i want the compressed air in the cylinder to be exhausted upon release, so that there is no remaining pressure. But this means that in my calculations, i have to include also the hose air volume, since the air in the hose will also be exhausted. So i made another spreadsheet with the hose volume included:
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