Italian coffee quantitative bean grinder how to grind coffee machine bean thickness adjustment matters needing attention

Quantitative bean grinder, literally, is able to set a grinding amount of coffee powder, eliminating the step of weighing powder (time), sounds like a more convenient bean grinder.

Is that actually the case? The quantitative bean grinder is divided into two working modes-fixed weight and timing. The common quantitative bean grinder on the market adopts the method of timing. The bean grinder used in the former street as an example, you can set the time to stop grinding. For example, it takes 3.5 seconds to grind 20g powder, then the grinding time can be set to 3.5 seconds, then in the subsequent quantitative grinding, the bean grinder will grind 3.5 seconds at a time.

There seems to be nothing wrong with it. In fact, in the process of using Qianjie, the error of grinding is as small as 0.3g and 1.3g as large. There are some details that we need to pay attention to. Detail 1: the gap between coffee beans looks at the dense coffee beans in the bean barn, in fact, the gap between beans and beans can be big. This involves the principle of accumulation. If the spheres of the same size are arranged equidistant, then the gap between the spheres is the same. But in fact, there are irregular objects on coffee beans of different sizes. Then the gap space between beans and beans is different, and it will cause a slight error (±0.3g) during regular grinding.

Detail 2: the amount of beans in the soybean warehouse is a less concerned perspective, usually slowing down the coffee beans in the bean warehouse, and then filling the beans only when the warehouse is empty. Qianjie did an experiment in which regular grinding was carried out under the condition of full warehouse and 1 stroke and 5 silos, and the other parameters remained the same. If the output of powder is 20g in 3.5 seconds in full warehouse, 18.7g in 3.5 seconds in 5 storehouses, with an error of 1.3g. Therefore, in the daily frequent production, blindly believe that quantitative may be with the increase in the number of grinding, the amount of powder is less and less. Therefore, although Qianjie uses a quantitative mill, it still comes with an electronic scale to check whether it meets the powder requirements.

The reason is that when the warehouse is full, the upper coffee beans will form weight pressure, pushing the lower beans through the knife plate, and as the amount of beans decreases, this pressure will gradually decrease. When the position is about to be empty, you can still see the phenomenon of "jumping beans" (coffee beans are bounced up). Therefore, Qianjie also recommends that the amount of beans in the soybean warehouse should be kept at 4-7 points full (do not replenish beans until the warehouse is empty), this state will be more stable.

Detail 3: there is residual powder in the channel. if you find that there is a little more and sometimes less powder in the quantitative grinding, then it may be caused by the powder stuck in the channel. If the passageway can be removed, regular cleaning will reduce the occurrence of this kind of situation. Detail 4: change the grinding degree, change the grinding degree will also lead to the change of timing powder output, the grinding scale moves to the fine direction, the powder output at the same time will be reduced; the grinding scale moves to the coarse direction, the powder output will increase at the same time. Therefore, it is necessary to reset the time after grinding. Finally, if the product is to be stable, even if it is a quantitative bean grinder, it is better to be equipped with an electronic scale.