Apprenticeship Milestones: The Sinking Test
银匠学徒制中的下凹考核节点
标签：学徒制, 考核, 下凹, 师徒传承, 技能标准
传统银匠学徒制的下凹考核一般设在第二学年：要求 2 h 内将 φ80 mm、1.2 mm 银片下凹成深 25 mm 的碗形，判分点包括壁厚差 ≤0.15 mm、无穿透褶皱、退火次数 ≤4 次；考核用凹砧孔径随机指定，逼学徒练出"读砧"能力。英制体系（如 Goldsmiths' Centre）沿用类似阶梯任务作为出师作品的前置考核。
In traditional silversmith apprenticeships the sinking test falls in the second year: sink a φ80 mm, 1.2 mm silver disc 25 mm deep within 2 h, judged on wall-thickness variation ≤0.15 mm, no through wrinkles and no more than four anneals. The stake-hole size is assigned at random to force "stake reading". UK schemes such as the Goldsmiths' Centre keep similar graded tasks as prerequisites for the finishing piece.