This study investigates the nature of the acoustic emission (AE) signal generated during single and multitooth face milling of steel. For this purpose, cutting tests were conducted on a vertical milling machine to determine the effects of cutting parameters, especially the angle of tool engagement and disengagement, the varying chip thickness, and the number of engaged teeth. The results show good correlation between the rms AE signal and the severity of the contact conditions during chip formation and at tool entry and exit. Cutting forces were also measured and a qualitative correlation between the specific AE rms voltage and the specific cutting force is seen.