Matching Rock Hardness:
Soft Rock (Compressive Strength < 80 MPa): Prioritize the use of a φ64 mm drill bit; a rotational speed of 800–1200 rpm is recommended.
Hard Rock (> 150 MPa): Requires a bit size of φ102 mm or larger, combined with high-frequency percussion (≥ 35 Hz).
Service Life Metrics:
Under typical granite conditions, the average service life of a YG8-grade drill bit is approximately 1500–2000 linear meters (Source: Sandvik Technical Manual).
Service life can be extended by over 20% through optimization of the water cooling system.