The fineness of the powder varies with the grinding time. You can control the grinding time or the number of grinding according to your needs.
Recommend grinding capacity one time:the material you gonna to grind one time must cover the long blade in the middle and no more than 2/3 of the tank.
Recommend use time: no more than 3 minutes. It takes 5-10 minutes to rest after every 3 minutes of work.
The grinder pulverizes materials through high-speed rotation and collision, which will generate heat to make the machine hot. This is a normal phenomenon and does not affect the normal use of the grinder. Please do not worry.