在現代機械製造的環節當中，微切削加工是近來關鍵的重要加工技術，它是一種快速且低成本的微小零件機械加工，隨著微機電系統、微機械的多樣化發展及微小元件的需求，微切削成為不可或缺的角色; 鋁材具備輕量、高強度、耐蝕及美觀等優異性能，因此，被廣泛應用於運輸工具，因為有著大量的需求，鋁合金加工成為金屬加工不可或缺的一環;鈦是20世紀50年代發展起來的一種重要的結構金屬，鈦合金因具有強度高、耐蝕性好、耐熱性高等特點而被廣泛用於各個領域，但由於鈦材料的各種機械性質，使其加工困難，加工成本亦將相對提高。
切削加工作業之設置，常依賴實務經驗作切削參數之設定，以優化切削結果。但依經驗選擇參數，通常較為主觀，且容易造成刀具及機器損傷;本實驗研究目的是探討微型球刀對於鋁合金及鈦合金進行切削，挑選切削方向、主軸轉速、切深、主軸角度、切削進給率這五項將會影響切削結果的參數，利用參數調整來優化表面粗糙度及刀具磨耗，本實驗將利用田口方法進行參數配對，在參數變化後進行實驗，試圖找出最佳切削結果的參數組合，利用結果分析了解各個參數的重要性，並找出使結果較為有利的趨勢，在最終實驗結果顯示，刀具偏擺角度將影響著微切削的表面粗糙度，偏擺角度與切削方向相同且偏擺20度將得到較佳表面粗糙度;而挑選與刀具傾斜方向垂直的切削方向將能優化刀具磨耗，切削力中的結果也顯示，穩定且較小的切削力將可以使產品獲得優良的表面粗糙度。

Micro-cutting plays an important role in advanced manufacturing because of the required tiny components. As a result, there is need for MEMS to be more functional, smaller and smarter. Aluminum is commonly used all over the world because it is much lighter, easy to machine and has good appearance. In 1950, titanium was discovered which has high strength, corrosion and heat resistance, but it is difficult and high cost to machine. Previously cutting parameter optimization were based on experience of machinist. The optimization based on machinist experience is not a scientific skill, so it resulted in tool and machine damage.
This study investigate cutting parameters using micro ball-end mill on aluminum and titanium. The factors considered includes cutting direction, spindle speed, depth of cut, spindle angle and feed rate. The Taguchi method was used to analyze and find the optimum cutting parameters to achieve minimum tool wear and surface roughness. The experimental results show that spindle angle has great effects on surface roughness and tool wear is highly depended on cutting direction. We can achieve good surface roughness by using constant and small cutting force.

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