the lumber process, when each surface of the member is planed to its final dressed dimension after shrinkage has occurred as a result of the drying or seasoning process. Generally, there is a 1/4- to 3/4-inch difference between the nominal and dressed sizes of dry sawn lumber (refer to NDS-S Table 1B for specific dimensions). to ball filling variation in the mill. The results obtained from this work show, the ball filling percentage variation is between 1.2 3.7% which is lower than mill ball filling percentage, according to the designed conditions (15%). In addition, acquired load samplings result for mill ball filling was 1.3%. The mill consumes a maximum power of 100 W. (Do not assume the mill produces 100W of comminution power) In Fig. 6 the parts of the mill are described. A B C Figure 6 Centrifugal ball mill A milling room with balls B counterweight to milling room and content C shaft The mill is able to turn up to 500 rpm and mill 200 ml of feedstock.