Corn oil is extracted from corn germ and there is no oil pressing equipment can press maize
directly to get the corn oil.

Small scale corn oil plant usually defined by the capacity ranging from 1 to 10 ton per day. 

Start small corn oil plant  from corn germ (instead of corn) would be more recommended. Corn germ usually can get from the maize flour plant.

The complete production line includes 2 processes: 
Maize Germ Oil Pressing and Corn Oil Refining.

Basically, oil yield of corn germ is about 37%~45%. 100kg of corn germ can press about 40kg of crude oil , refining oil would be 34 kg.