Grinder Gravity

I've always tried my darnedest to keep my espresso hoppers full - I was told in training that the gravity of the espresso in the hopper affects the grind.
Lately, however, I've been wondering if this is true. Does the espresso level in the hopper affect the grind?
I noticed some of the WBC competitors didn't have their hopper full either...

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Permalink Reply by Mike McGinness on March 29, 2009 at 9:46pm
No, I don't exclusively follow any one dogma spiritually.

Jason Haeger said:
While I agree with you, the first version sounded quite Buddhist. Are you Buddhist?

miKe mcKoffee aka Mike McGinness said:
Funny? Seriously? Philosophical certainly. A philosphy I live by allowing me to never stop learning. When it comes to coffee (as in most things) the more I know, the more I know I don't know.

Aaron McNany said:
hahah that's funny

miKe mcKoffee aka Mike McGinness said:
Ultimately the quest for Koffee Nirvana is a solitary path. To know I must first not know. And in knowing know I know not. Each Personal enlightenment found exploring the many divergent foot steps of Those who have gone before.
Permalink Reply by Rolf Foerster on March 30, 2009 at 2:52am
According to my tests it is not a question of gravity. Important is whether the burrs can kick a bean upward instead of grabbing it and press it between the burrs/grinding teeth. It seems like about 8 inch - measured from the burrs - of coffee are fine to eliminate the upward kick.

But this depends also on the design of the hopper neck and the neck of the grind chamber.

I made a test a while ago using a hopper filled more than half and ground several portions, timer driven. And then repeated the test with a wheight of 11 lbs on top of the coffee. No quantity changes occured.
I made this test using a grind on demand MAHLKONIG K60 ES.
Permalink Reply by Jesse -D-> on March 30, 2009 at 6:40am
Interesting, thanks Rolf.

Rolf Foerster said:
According to my tests it is not a question of gravity. Important is whether the burrs can kick a bean upward instead of grabbing it and press it between the burrs/grinding teeth. It seems like about 8 inch - measured from the burrs - of coffee are fine to eliminate the upward kick.

But this depends also on the design of the hopper neck and the neck of the grind chamber.

I made a test a while ago using a hopper filled more than half and ground several portions, timer driven. And then repeated the test with a wheight of 11 lbs on top of the coffee. No quantity changes occured.
I made this test using a grind on demand MAHLKONIG K60 ES.

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