The objective of this work is to study the effect of some operational factors on the performance of the rice milling machine. These factors are, feed rate, moisture content of paddy rice (raw material) and whitening roll speed on the power consumed, required torque, grain damage and unit energy per Kg of white ric, (product) in the milling process. The samples of paddy rice Japanes variety used in the experimental work. From the experimental results the following conclusions are obtained:
1. Feed rate of (6.5 kg/min) is found to be an optimum value at M.C.. 13% and 450 R.P.M.
2. As the M.C. (moisture content) of paddy rice increases the grain damage decreases at all roller speeds.
3. As the feed rate increases the grain damage decreases until it reaches an optimum value and then increases.