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The objective of this research is to study and compare quality milling surfaces, and the effects of plastic mould steels AISI-1050 and AISI-P20, in a milling process with various parameters based on experimental conditions, such as: 1) feed rates at 45, 50 and 55 mm/min, 2) spindle speeds of 510, 572 and 637 rpm, and 3) milling levels at 3, 5, and 10 mm, respectively, using a 10 mm twin flute ended type mill. The experimental results found that plastic mould steels which had the best quality milling surface were AISI-P20 and AISI-1050, with roughnesses of 2.627 μm and 2.120 μm, respectively. Quality milling surfaces were milled by using the most suitable parameter feed rate of 45 mm/min, a spindle speed of 637 rpm and a cut depth level of 3 mm, for both tested grades. However, characteristics of milling surfaces and wear of the mill end were directly influenced by changes of parameters for all test conditions. As a result, the quality of milling surfaces also changed.