Fig. 5
From: Investigation on micro drilling of low carbon NiTi alloy using tungsten carbide micro drill tool
a Perfect drill hole with a diameter of 501 μm, having burr and shear zone at the bottom of the blind hole. b Perfect drill hole with an average diameter of 516 μm, having metal shear zone at the start and end point of the blind hole. c Perfect drill hole with a maximum diameter of 546 μm, having metal shear zone the start and end point of the blind hole.
