elbertfunkleberg wrote:Or rather, you think you can do anything. You have to have a lot of faith that everything that is being represented on the screen is actually happening in the machine. Personally I'm of the opinion that there are wide margins of error. If this were not the case I doubt there would be so many complaints about the quality of the coffee produced.
Those are bold opinions. Care to elaborate on the basis of your conclusion?
Here are some facts to be mindful of:
1) Every machine is pressure and temperature calibrated with a SCACE prior to being shipped.
2) Temperature and Pressure probes don't really drift; however, Decent is working on a SCACE competitor so that users can confirm calibration of sensors on a regular basis.
3) Flow has gotten very accurate with a firmware update last fall. I have run many tests. If I set my machine to 4ml/s flow and run my machine for 10 seconds I get 40 ml/s with +/-2 every time. That is insanely accurate. More accurate than the flow meter on pretty much any machine you could name. This can also be calibrated if a user tests this and theirs somehow is off.
I have a very, very high confidence that the numbers we are seeing are as accurate as any machine can produce and repeat. Just because users are having difficulty does not mean the machine is inaccurate. It means one of two things. 1) The machine could be malfunctioning. The DE team will help diagnose and if it is a faulty machine, you have the best customer service I've ever seen. 2) The user is not creating a profile suited for the bean they are using (including brew ratio, grind size, etc). #2 is the whole purpose of this thread. Pressure and flow profiling is not some magic formula for better espresso every time. This is relatively new territory and it's all trial and error. And a whole lot of fun figuring it all out.