According to the material properties and processing requirements of different configuration of the corresponding tools and orifice plate, you can process different sizes of particles, in order to meet the process requirements of the next process.
Should the orifice plate used for a long time, another with not much money, that is more than 100 dollars, then grinding the orifice is not good to wear, too much time, if it is broken or reamer, can be worn, the more easily, with their grinding stone a few on it
The knife needs sharpening, and the change of the blade costs too much.
