Rice grader uses two pieces of rubber roll as a means of breaking the un-hulled rice. Both roll is mounted adjacent (parallel) with a certain distance and rotated at different speeds in opposite directions. Roller that rotates at high speed is called main rollers or fixed roll, while the other roll is called auxiliary rollers or moveable roll.
The main roll is mounted on a stationary shaft while the auxiliary roller mounted on a shaft whose position can be shifted to adjust the distance (gap) between the two roll. Auxiliary roll speed should be slower for about 24% of the main roll.

Many researchers have already identified factors affecting performance of such milling machines as paddy husker and rice whiteners. Garibaldi (1981) reported that the appropriate ratio for rotational speed of the slow roller to the fast roller is 0.75 to 0.8 and the suitable peripheral speed difference between two rollers is 2 m s -1 . Tavakoli et al. (2002) reported that the most appropriate clearance between the rubber rollers for a laboratory husker for three varieties of Binam, Khazar and Sepidroud was ranged from 0.45 to 0.65 mm. Payman et al. (1999) determined the most suitable spacing between rubber rolls for increasing husking percentage and reducing rice breakage in the test huller. Alizadeh and Payman (2004) reported that use of blade-type whitener as a huller in milling process increased rice breakage in comparison with rubber roller husker.

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