3. Calibration Machine– Stone calibration machines serve as the first stage in automated slab finishing lines. A calibration machine is specialized equipment used to grind the surface of a stone slab to a precise, uniform, and fixed thickness. This process is essential for removing uneven surfaces and irregularities left after cutting, ensuring the slabs have a perfectly level and flat surface before they undergo subsequent finishing stages, such as polishing. The machine ensures that each slab’s thickness identical, which is critical for high-end countertops