建立方向盘项目初始版本

deliverables/3D打印文件_铜柱版/打印和装配说明.md

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+# 3D 打印清单：编码器铜柱版
+
+本包只整理当前编码器方案的两个试装打印件。每个 STL 是一个零件，单位为 mm，不要缩放；请打印店分别上传，每件打印 1 个。STEP 供需要时查看或报价，FCStd 用于编辑和查看，不是额外的打印数量。
+
+| 文件 | 数量 | 用途 |
+| --- | --- | --- |
+| 编码器支架_无立柱.stl | 1 | 四个安装孔连接 M4 铜柱，固定 MT6826S 圆形 PCB |
+| 磁铁座_单件.stl | 1 | 用 M3 贯穿螺丝和螺母固定在电机旋转中心轴上，安装 Ø10 × 3 mm 径向充磁磁铁 |
+
+建议选择适合电机周围温度的材料，例如 PETG 或耐温更高的材料；请打印店按所选工艺确认能否打印、材料精度和尺寸。打印时保留所有孔与支承结构，不要擅自封孔或缩放。以上是首次试装件，未经实际切片、打印或实物验证。
+
+## 编码器支架与铜柱
+
+支架平板约 49 × 49 × 3.2 mm，四孔中心位于 PCD 50 mm，孔径 4.4 mm；保留 PCB 的三个 Ø1.8 mm 导孔及原设计承托区域。PCB 直径 33 mm、厚 1.6 mm、芯片突出 0.8 mm 仍是建模假设，PCB 孔距、元件和焊线空间以实物为准。
+
+外购 4 根 M4 公母六角铜柱，柱身 10 mm（不含公牙）、对边约 7 mm。公牙长度必须按电机螺纹的实际有效深度选择，不能仅由 M4×8 判断电机孔深；确保装紧后既不会顶到底，又有足够有效啮合。铜柱固定电机 PCD50 孔，电机的四个小角码另用 PCD76 孔。PCD50 与 PCD76 相位、铜柱及实物角码的配合仍需试装。
+
+建议各铜柱与支架之间先放相同厚度的 1 mm 金属平垫片。10 mm 铜柱 + 1 mm 垫片时，按假设 PCB 厚 1.6 mm、芯片突出 0.8 mm、磁铁表面离电机基准面 7.5 mm 计算，名义间隙约 1.1 mm；实物间隙不一定是此数值。增加四处同厚垫片会增加间隙，减少则减小；不要在不知道间隙时直接通电高速旋转。先断电慢转检查碰擦和偏心，再确认角度及磁场读数。
+
+四颗支架固定螺钉的长度根据支架厚度、平垫片及铜柱母牙深选择，必须有有效咬合且不顶底。三个 PCB 孔按 M2 自攻螺钉的旧版方案设计，实际大小、PCB 固定、焊点和电线是否压住均先试配，避免用力拧裂 PCB。
+
+## 磁铁座
+
+磁铁座原试装模型底部 Ø27 mm、总高 7.5 mm；M3 通孔 Ø3.3 mm，磁铁槽 Ø10.3 × 3 mm。螺丝头按厚 2.2 mm、直径不大于 7.2 mm 假设，实物直径需确认。先检查贯穿螺栓及螺母装配空间，固定磁铁后确认其不会松脱；手动转动检查磁铁居中且不碰芯片。中心孔定位与真实磁场需要实物验证。
+
+## 不在本次打印清单内
+
+- 风扇改为直接固定在 2020 型材上，无需原打印风扇支架。
+- 编码器调距采用购买的金属垫片，无需旧的薄打印垫片与拼接板。
+- 转向灯回正轴套只有概念示意，回正触点位置、拨片形状和键槽相位尚未验证；`回正轴套_仅供参考.png` 不是打印文件。
+- 电机转接盘、70 转接盘和轴承固定板使用金属件，不在本打印清单中。

deliverables/3D打印文件_铜柱版/磁铁座_单件.step

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+#367 = DIRECTION('',(1.,0.,-0.));
+#368 = ( GEOMETRIC_REPRESENTATION_CONTEXT(3) 
+GLOBAL_UNCERTAINTY_ASSIGNED_CONTEXT((#372)) GLOBAL_UNIT_ASSIGNED_CONTEXT
+((#369,#370,#371)) REPRESENTATION_CONTEXT('Context #1',
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+#373 = PRODUCT_RELATED_PRODUCT_CATEGORY('part',$,(#7));
+ENDSEC;
+END-ISO-10303-21;