Design and Development Trends in Micro drilling Tools: Review

Abstract

Microdrilling, a critical process in industries such as electronics, biomedical, aerospace, and watchmaking, demands precision tooling and optimized design due to the sub-millimeter scale of operations. The microdrill, being central to this process, has undergone significant advancements in terms of material selection, geometry optimization, surface treatment, and coating technologies. This review paper aims to provide a consolidated understanding of the design principles of microdrills, focusing on aspects such as point angle, helix angle, flute design, and runout control. The role of ultra-hard materials like tungsten carbide and advancements in micro-coatings such as TiAlN and DLC are discussed in depth. Additionally, recent innovations in fabrication methods, including laser ablation and micro-EDM, are examined for their contributions to tool miniaturization and accuracy. Performance metrics such as tool life, chip evacuation, burr formation, and hole quality are evaluated in light of recent experimental and simulation-based studies. This paper concludes by highlighting current challenges and future research directions in the microdrill design domain, particularly toward smart, sensor-integrated microtools and hybrid-material solutions.

Cite as:

Pranesh Bamankar, & A. Awasare. (2025). Design and Development Trends in Micro drilling Tools: Review. Design and Development Trends in Micro Drilling Tools: Review, 8(2), 32–38. 

https://doi.org/10.5281/zenodo.16263045