Investigations of operating parameters of widely used sand mixers reveal a wide variability range in the values of parameters associated

with their power demand. Power efficiency of manufacturing processes has received a great deal of attention lately, which encourages the

research efforts to optimise this aspects of operation of machines and installations as well. In the first place these machines

and installations have to work properly as a part of the process line- which applies also to moulding sand mixers. Experiments conducted

by the authors suggest that the same goal can be achieved at variable energy input levels. To obtain information about the power demands

of sand mixers requires the use of highly specialised equipment, methodology and result processing procedures. This study provides a brief

characteristic of measurement equipment and results of measurements taken on a unit AG-015 (based on a roller mixer) and a laboratory

rotor mixer.