Most coffee grinders have a large bean hopper on top that feed the grinding mechanism, and mine uses a power on timer that can be changed from 5-30 seconds. Th

Most coffee grinders have a large bean hopper on top that feed the grinding mechanism, and mine uses a power on timer that can be changed from 5-30 seconds. The grinder processes beans at what seems to be a pretty constant beans/second flow rate, and through trial and error I figured out that "X beans/second * 12 seconds = Y volume of ground coffee" makes a cup of coffee that I like. I've never bothered to figure out what "Y" actually equals, and the flow rate seems to stay constant enough that 12 seconds always works out to a good cup.