Planetary ball milling is a technique for reducing and homogenizing the average particle size of powder samples. This can also be used for mixing different powder samples into a homogenous mixture. This technique is mainly used for preparing samples for powder XRD and XRF. Our laboratory houses two (2) variant models of Retsch planetary ball mills, only differing in the number of ball jars, the volumetric capacity of each ball jar and maximum rotational speed. Both models are capable of storing 10 custom SOP’s, direction reversal and interval operation.