Abstract: Aiming at the deficiencies in efficiency and machining quality of conventional milling, this paper analyzes the original processing method for counterbore holes on the upper housing of mining-crusher components and optimizes the traditional machining program. A general process for machining such features is summarized. Through a series of process improvements, a programming template is developed. The template realizes smooth connection of entry-exit tool paths, simple adjustability of cutting diameter, and contour-following machining to reduce idle tool travel. Practical production applications verify the rationality of the proposed method, which can provide references for solving the problems of machining accuracy and quality of counterbore holes on mining-crusher upper housings.