建立方向盘项目初始版本

models/turn_signal_cam_v2/DONE.txt

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+ok

models/turn_signal_cam_v2/geometry_check.txt

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+PRELIMINARY concept only, do not print.
+Shaft: 12x100; middle keyway only, shaft end details omitted.
+Body axial overall 20; cam corner radius 21.7706; total swept diameter 43.5412
+Clamping envelope including screw/nut and ears 33.4718
+key: 4 x 4 x 12 hypothetical; local keyway depth shaft 2mm and hub 2.3mm, width 4.2mm.
+clamp gap 0.4mm, bore 12.2mm nominal; M3 clearance dia 3.4; cylindrical 6.6mm relief (nut captured only visually, nut rotation restraint not modeled).
+Calculated positive-volume intersections (mm3):
+upper-lower 0.00000000
+upper-shaft 0.00000000
+lower-shaft 0.00000000
+key-shaft 0.00000000
+key-upper 0.00000000
+key-lower 0.00000000
+hardware0-upper 0.00000000
+hardware0-lower 0.00000000
+hardware0-shaft 0.00000000
+hardware1-upper 0.00000000
+hardware1-lower 0.00000000
+hardware1-shaft 0.00000000
+hardware2-upper 0.00000000
+hardware2-lower 0.00000000
+hardware2-shaft 0.00000000
+hardware3-upper 0.00000000
+hardware3-lower 0.00000000
+hardware3-shaft 0.00000000
+Fastener hex socket and actual switch/cam clearance unmodeled; proposed material, deflection, load and tooling clearance not validated.
+100mm shaft position is schematic, module, both bearings, motor connection and wheel are unmodeled; fit cannot be inferred.

models/turn_signal_cam_v2/示意说明.md

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+# 回正轴套 V2：3D 示意
+
+此模型供讨论，不是可直接打印的设计。轴为 Ø12 × 100 mm，轴套长 20 mm；图中轴套位于轴中点仅为展示。轴两端法兰、两个 KFL001、50 mm 厚转向灯模块及方向盘均未建模，不能判断 100 mm 轴是否足够。
+
+轴套为两瓣，带单个一体凸块和两只穿越分型面的示意 M3 螺钉；总旋转包络约 Ø43.54 mm，夹紧区包括示意螺钉与螺母的包络约 Ø33.47 mm。它们分别距 Ø44 和 Ø34 的名义径向边界约 0.23 和 0.27 mm，实际打印误差需要额外余量。
+
+轴示意只在中段开键槽，4 × 4 × 12 mm 的金属键位于轴套范围内；轴两端键槽未建模。轴孔 Ø12.2 mm 为概念模型假设，尚未按打印工艺验证。轴的实际键槽位置、深度和键长须核对，并且要避开轴承配合区。
+
+孔位、螺母防转、螺丝头工具接近、实际开关回正触点、拨片形状和受力、强度及打印误差均未验证。键槽固定了凸块的角相位；需要根据转向灯实际中位决定相位或另设计调整方法。`geometry_check.txt` 是简化实体的几何结果，不证明实物可装或可靠性。