Hi Gene,

Sorry I am sending so many emails today. I guess it means I am getting a lot done! I have a couple more plots for you. These are the figures that result from the constant velocity controller. I wrote a little script so its very easy to change the numbers if you want.

In other news, I took the TTP into the software lab and I got the simpleTerm program up and running. Unfortunately, even though the pump is running there isn't enough pressure to retract the bellows, which makes things interesting for me to say the least. 

I also went ahead and made a different plot, which shows two different estimations of the bellows volume. The first method is my original calculation based on the video that Todd captured for me. The second method is to take the displacement of the spring-loaded piston, which I assume to have a diameter of 2 inches (does this seem reasonable? Its so hard to tell from the Parker spec-sheet), so that the displaced volume should be the change in piston height multiplied by (pi*2^2)/4. Unfortunately, these values are not in very close agreement. Currently I'm blaming it on the fact that there clearly is some air somewhere in the system. I'm basing this on the first part of the curve, where the bellows expands, but the piston does not move at all. We also never got rid of the stiction in the piston, so I'm a little suspicious of those results. Do you have any thoughts on the matter?