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Problem statement: In die and mold industries, surface roughness of the dies and molds&#13; produced will determine the end product quality. Therefore, the desired finish surface was specified&#13; and the appropriate processes were selected to reach the required quality. Among many contributors to&#13; surface quality problem, backcutting is one of the factors influencing the surface roughness.&#13; Approach: The aim for current research was to study the backcutting phenomena and their effect to&#13; the surface roughness of work material, AISI H13 with hardness of 48 HRC during high speed end&#13; milling. Machining performed on the Vertical Milling Centre (VMC) high cutting speed from 150-250&#13; m min-1, feed rate 0.05-0.15 mm tooth-1 and depth of cut 0.1-0.5 mm. The analysis and observation of&#13; the backcutting phenomena are done by using optical surface roughness machine. Results: The result&#13; shown that the pattern of surface roughness was not sufficient enough to compare between the surface&#13; with backcutting and without backcutting and the backcutting phenomena were seen mostly in&#13; combination of medium to high cutting speed and medium to high feedrate.&#13; Conclusion/Recommendations: Further research is needed with incrimination of experiments and&#13; adjustments of parameters

A Study of Parameters Relationship to Backcutting Phenomena During High Speed End Milling of AISI H13