{"methods": ["manual_block", "orbital", "random_orbital", "belt", "disc", "drum"], "category": "sanding", "parameters": {"backing_types": ["paper", "cloth", "fiber", "film"], "grit_range_FEPA": {"max": 2500, "min": 40}, "roughness_Ra_um": {"max": 12.5, "min": 0.1}, "abrasive_materials": ["aluminum_oxide", "silicon_carbide", "zirconia", "ceramic"]}, "applications": ["paint_prep", "defect_removal", "surface_leveling", "wood_metal_finish"], "process_type": "surface_finishing", "grit_sequence": {"fine": "P600-P1200", "prep": "P100-P180", "rough": "P40-P80", "finish": "P220-P400", "polish": "P1500-P2500"}}