We wore out our venerable Mr. Coffee coffee grinder. It made a lot of noise but the blades were so smooth that they would not feed the beans. Here is a photo (which you can click to see larger)
Candy and I decided to move “up market” a bit, and bought a Baratza Encore coffee grinder.
What a world of difference! We should have switched to the Baratza years ago. It is quieter and faster than the old grinder. Most importantly, it does a better job of grinding the beans fine enough to work in our Aerobie AeroPress.