In recent years, micro-sized V-shaped grooves have been designed on substrates used in fiber optic docking, 

medical cell analysis, and photovoltaic cell lamps. 

These grooves enable new functions such as positioning fine fiber arrays and guiding tiny cells. 

However, these high-value-added substrates are mostly made of hard, brittle materials that are difficult to machine. 

These processes rely on inefficient and costly photo- and chemical etching methods. 

This study addresses the key technical challenge of fine-grained finishing using grinding wheel V-tips to ensure precise machining.

In this study, the V-tips of diamond grinding wheels were trimmed using both CNC grinding and contact discharge techniques to analyze the feasibility of fine-grained finishing. 

Furthermore, a detection and evaluation model for the V-tip angle and tip radius was established to investigate the factors influencing the quality of diamond V-tips. 

Experimental analysis of trimming accuracy and efficiency was also conducted.

First, CNC grinding was used to trim diamond V-tips, 

and machining experiments were conducted. Experimental results show that when dressing the V-tip of an SD600 diamond grinding wheel using a #600GC grinding stone, 

the tip radius can be reduced to less than 20 μm. The fine diamond abrasive grains on the V-tip can be trimmed, making it suitable for microgrooving. 

When machining single-crystal silicon, the microgrooving tip radius reached 28.3 μm, and the aspect ratio reached 0.20. 

Furthermore, the micro-abrasive grain profile of the V-tip significantly influences dressing efficiency and machining accuracy. 

Compared with dressing using a #180GC oilstone, dressing with #600GC achieves a better micro-abrasive grain profile, increasing the material removal rate by approximately threefold in microgrooving. 

However, the dressing rate decreases by 6-7 times. Furthermore, contact discharge dressing of the V-tip of a metal-bonded diamond grinding wheel was also performed.

The study found that a discharge voltage of 7V and a discharge frequency of 500Hz achieved a better forming angle and a smaller tip arc radius. 

The dressing rate of contact discharge dressing was approximately 350 times that of dressing with a #600GC oilstone,

 and the dressing efficiency was approximately 59 times that of dressing with a #600GC grinding stone. 

Finally, the dressed grinding wheel V-tip was used to machine carbide turning tool tips, 

fiber-optic-connected quartz substrates, and micrometer-scale groove arrays and pyramidal space arrays on SiC ceramic and WC carbide substrates. 

The experimental results have shown promising application prospects and provide a theoretical basis and basic parameters 

for promoting the application of diamond grinding wheel V-tips in micromachining.