MICRO METROLOGY | CASE STUDY
<< Figure 5: Image showing points of data collection (head, forward surface, and inside surface) from various drill bits. >>
prolonged test periods (see figure 6). Initially, the drill bits would smooth out but with prolonged usage the drill bit material was displaced causing a roughening of the surface.
Additionally, a cross-material analysis was performed where several drill bits that differed, either in materials or coatings, were used and measured pre- and post- testing. The drill bits used were Titanium CarboNitride (TiCN), High Speed Steel (HSS), a drill bit with Titanium Nitrite (TiN) coating, and one containing a Silicon Carbide nano-composite. The post usage results obtained with these bits are shown in figure 7.
The results clearly indicated that the Silicone Carbide composite drill bit experienced the least amount of material re-deposition after usage.
The simplicity and ease of use of the NPFLEX 3D Optical Microscope, combined with critical measurement capabilities, allowed this large tool manufacturer to test drill bit performance, develop improved tool quality at lower cost, while increasing its speed to market.
Bruker Nano Surfaces Division
www.bruker.com/nano
<< Figure 6: Surface texture analysis of drill bits with
increasing usage. >>
<< Figure 7: Cross-material characterisation of drill bits post-tribology testing. >>
27 | commercial micro manufacturing international Vol 7 No.1
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