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wheel/models/conversion_disk_m4_drill/说明.md

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# 转换盘 M4 底孔报价识别测试版
外圈 PCD48 的六孔建为 **Ø3.3 mm 圆柱通孔**(M4 × 0.7 常用攻牙底孔),其余孔位、轮廓、板厚与原参数化模型保持一致。
该文件仅供报价系统识别底孔测试,**模型没有螺旋牙型,也不包含 M4 螺纹标注或线程语义**;若实际要求攻 M4 × 0.7,必须在厂家报价及加工要求里单独明确,不能认为上传这个文件就自动包含螺纹加工。具体底孔由厂家按材料及工艺确定。
保留的实体螺纹模型在 `models/conversion_disk_m4`,原始转换盘模型也未覆盖。`validation.txt` 记录重开、孔径、孔数量和轮廓差异检查。