建立方向盘项目初始版本

models/pcd50_pillar_concept/DONE.txt

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+ok

models/pcd50_pillar_concept/geometry_check.txt

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+CONCEPT ONLY: PCD50/PCD76 phase45 and slot9.5x5.5 assumed.
+Corners flush to motor, moved 2.5mm outward from slot midpoint; 4mm screw nominal slot-end clearance 0.25mm.
+Pillars 0.5..10.9mm and panel 10.9..14.1mm; closed Ø4.4mm bore.
+M4x20 nominal screw engagement in motor 20 - 14.1 = 5.9mm, true tapped depth unknown.
+Pillar cylinders Ø9 extend from z0.5 to 14.1 and merge through panel; clipped at z0.5..3.21 against expanded corner projection 0.2mm.
+Minimum low-side wall near angle ~0.54mm theoretical, no print/strength guarantee.
+Estimated head bearing material by sampling (mm2): 24.00, 24.00, 24.00, 24.00
+Selected positive-volume intersections >0.001mm3:
+none
+Tool envelope Ø7.5:
+M4 tool 0: no checked obstruction
+M4 tool 1: no checked obstruction
+M4 tool 2: no checked obstruction
+M4 tool 3: no checked obstruction
+76 M4 tool -1,-1: no checked obstruction
+76 M4 tool -1,+1: no checked obstruction
+76 M4 tool +1,-1: no checked obstruction
+76 M4 tool +1,+1: no checked obstruction
+Low-bore shell check (positive shell is expected):
+Pillar0 z=1.0 closed-bore surrounding shell missing samples: 0/72
+Pillar0 z=13.0 closed-bore surrounding shell missing samples: 0/72
+Pillar1 z=1.0 closed-bore surrounding shell missing samples: 0/72
+Pillar1 z=13.0 closed-bore surrounding shell missing samples: 0/72
+Pillar2 z=1.0 closed-bore surrounding shell missing samples: 0/72
+Pillar2 z=13.0 closed-bore surrounding shell missing samples: 0/72
+Pillar3 z=1.0 closed-bore surrounding shell missing samples: 0/72
+Pillar3 z=13.0 closed-bore surrounding shell missing samples: 0/72

models/pcd50_pillar_concept/方案说明.md

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+# PCD50 面板连体立柱概念方案
+
+本文件夹为结构讨论与简化装配检查，不是最终打印文件。已有电机模型、磁铁座和打印文件没有被修改。
+
+编码器方形面板向电机延伸四根立柱，柱与面板为一个实体；每根柱设直径 4.4 mm 的闭合贯穿孔，M4 螺丝穿过面板与柱并拧入电机 PCD50 孔。PCB 和磁铁沿用现有模型的位置，四柱脚下各用一片 0.5 mm 示意垫片用于调整间隙，名义芯片与磁铁间隙 1 mm。
+
+PCD76 四角码直接贴电机，每侧按椭圆槽相对中点向外偏 2.5 mm 的示意位置放置，型材同步向外。槽宽 5.5 mm 和两组孔圈 45° 相位均为未实测假设；按 M4 直径 4.0 mm 和此槽宽估算，槽端名义剩余约 0.25 mm，实际可用偏移未证实。角码底脚的范围向外扩 0.2 mm，柱底及其垫片对这个范围局部削边以让位，柱孔仍保持闭合。估算最薄柱壁约 0.54 mm，十分依赖实际尺寸和打印设备，尚未验证打印可靠性或使用强度，不能直接作为打印定稿。
+
+模型中面板外表面距电机后固定面 14.1 mm；示意采用 M4×20 mm，未加螺丝头下垫片时名义进入电机 20 − 14.1 = 5.9 mm。如果使用厚 0.8 mm 的头下垫片，名义进入电机约 5.1 mm。实际柱高度、垫片、螺钉长度公差和电机孔有效深度须核实，不能仅凭此计算认定螺丝合适；不要顶到孔底。
+
+`geometry_check.txt` 包含简化零件的正体积干涉及 50/76 螺丝工具圆柱包络检查；四孔低位和面板内部的环形材料按 72 个方向采样以检查闭孔，螺丝头承压面仅为几何采样，不代表强度或可靠性。T 槽螺母、PCB 背面实际焊点与线缆、真人操作工具、实际角码圆角、力矩及旋转均未实物验证。
+
+`PCD50_Pillar_Assembly.FCStd` / `.step` 是概念装配；`assembly.png` 为总装、`bracket.png` 为支架单体、`section.png` 为示意剖切图、`rear.png` 为后视。对应的脚本 `scripts/rebuild_pcd50_pillar_concept.FCMacro` 会覆盖本文件夹的模型和图像。