I started a post on ‘static’ with ground coffee a while ago and received several very helpful and technical explanations as to why this was simple with coffee grinders and went far beyond any issues with earthing of the grinder.
My problem was with a new Mignon Zero grinder which I had recently bought to replace one of my other grinders. As predicted by the techies after running coffee through the grinder for a while (and initially using James Hoffmann’s water spray technique before grinding) the problem resolved and the grounds no longer clump and stick to the sides of the spout and dosing cup.
When I bought the new grinder I also bought the single dose hopper and bellows for my older Mignon grinder (which didn’t seem to have a problem with ‘static’).
Since returning to France, where I use this one now, the ‘static’ problem has been severe. Grounds stick to the spout and sides of the metal dosing cup as well as on the outside of the spout. This grinder has been in use for a couple of years so is well ‘run in’. I am not spraying the beans before I grind them.
I checked the grinder today while cleaning it and confirmed that there is a good connection between the earth wire and all metal parts of the grinder.
Can anyone suggest a solution?