[floydpink]

hmmm, I can't remember ever having ground coffee from the day before.

If it is left in the grinder and I'm not using it within 20 minutes, it's going into the sink.

When you say the Silvia needs calibration every day, I am wondering if you mean the Rocky needs calibration every day.

Silvia= espresso machine
Rocky= Grinder


I'm not even sure what calibrating an espresso machine is, but am with a grinder.

My grind and tamp depend more on the particular bean and roast I am using than the humidity.

I use a Macap M4 with the worm drive and can say that since I have dialed in, 1/4 to 1/2 turn is the most my grinder moves.

I do occassionally time my double shots to ensure they fall in the 25-30 second pull time frame and then make minute adjustments based on the results.

Normally, I'm working through a 5 lb bag of beans I am roasting once a week and the adjustments are rare until I switch beans and roast.