Now I am back on the PC as well…Pump acc allows a more curvy profile…which I prefer, but unless stages are extended, then it may not have time to reach the various pressures.
In effect the pump can modulate the profile.
- We have a rapid pump acceleration with rapid changes, many profiling machines fo this and have no way for the user to change pump acc
- This is the smoother transitions I prefer (you can also round off the steps as an intermediate between 1 and 2)
- You cannot take the same profile 1 and expect it to change to 3 or even hit the pressures if you don’t extend the stages.
The more abrupt the changes depending on puck density and flow rate, the harder it is for the PID to reach the goal. Puck density also changes through the shot..This means that initially there is a high ability to make pressure and a slow ability to lose it…..especially during the puck compression and ramp to full pressure.
Here is another shocker….Machines don’t always tell the truth, hard to believe. The Vesuvius is super truthful, apart from coding out anything below 1 bar as it’s inaccurate. Some machines seem to hit pressures exactly, but this is because it’s calculated from voltage or impulses, it’s not showing you the actual pressure. Some just show you the profile as it runs….
