I think that a compressed spring is ideally suited to provide pressure due to the fact that it's pressure decline somewhat matches the reduction of resistance as the puck erodes

This is what fascinates me about making espresso. It turns out that making espresso is an thermodynamics challenge, an electronics challenge, a hydraulics challenge, and a fluid flow dynamics problem all wrapped up in a compact physical package. Understanding it and designing the control system has ...

Wow, very interesting!!

I have the same group that the pro800 uses. I have used it with two springs, one spring, and manual lever configuration (I made a direct-lever conversion). For the coffees I prefer (decaf classic Italian espresso) I like the single spring configuration best. My point is that type of coffee and prefe...

You might want to compare this profile to those captured using the smart espresso profiler from other spring lever espresso groups

Not without grinding or filing and the ears are 45 degrees out

Very cool. Where are those temperature probed located?

What is causing the clicking noise? I wasn't aware that the pro800 used a relay

What is the line voltage when this happens? It could be too low for the PID to operate. I guess you will know if it works when the power service has been restored

Very transparent and impressive information! I continue to be impressed by many of the management processes you employ