Your thinking isn't wrong at least when adjusting coarser, but I run the grinder whenever adjusting the grind on the Vario anyway. When adjusting finer even small particles retained due to oil can cause the burrs to have pressure spots, so I would always run the grinder when going tighter.
Several people have complained about Vario grind consistency when adjusting in either direction, and I've found that if I run the grinder when adjusting I get consistent adjustments time after time. If I don't run the grinder when adjusting, even coarser, there seemed to be a little bit of inconsistency for about 2 shots. Remember the Vario uses a different adjustment mechanism than many grinders out there, so this advice might not be relevant to other equipment.
selzoc Senior Member Joined: 21 Jul 2009 Posts: 44 Location: RTP Expertise: Just starting
Posted Fri Dec 6, 2013, 8:16am Subject: Re: Grinder (Vario) adjustment - espresso to drip and vice-versa
I switch my Vario between espresso and pourover settings on a daily basis, and ALWAYS run the grinder when switching. I have no problems with it going back to an espresso grind. One thing I do, though, is to run a few beans of my espresso through once adjusted back, to clear out any remaining residue from the beans I use for pourover.
Partially ground coffee beans may remain between the burrs when the grinder is turned off. When making ANY grind adjustment the grinder must be running. After a macro or micro adjustment is made, allow 5 grams of coffee to pass through the grinder to receive the desired grind.
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