建立方向盘项目初始版本

models/encoder_shared76_print_v1/DONE.txt

@@ -0,0 +1 @@
+ok

models/encoder_shared76_print_v1/Shim05.step

@@ -0,0 +1,128 @@
+ISO-10303-21;
+HEADER;
+FILE_DESCRIPTION(('FreeCAD Model'),'2;1');
+FILE_NAME('Open CASCADE Shape Model','2026-10-28T10:41:16',(''),(''),
+  'Open CASCADE STEP processor 7.8','FreeCAD','Unknown');
+FILE_SCHEMA(('AUTOMOTIVE_DESIGN { 1 0 10303 214 1 1 1 1 }'));
+ENDSEC;
+DATA;
+#1 = APPLICATION_PROTOCOL_DEFINITION('international standard',
+  'automotive_design',2000,#2);
+#2 = APPLICATION_CONTEXT(
+  'core data for automotive mechanical design processes');
+#3 = SHAPE_DEFINITION_REPRESENTATION(#4,#10);
+#4 = PRODUCT_DEFINITION_SHAPE('','',#5);
+#5 = PRODUCT_DEFINITION('design','',#6,#9);
+#6 = PRODUCT_DEFINITION_FORMATION('','',#7);
+#7 = PRODUCT('M4 shim 0.5mm','M4 shim 0.5mm','',(#8));
+#8 = PRODUCT_CONTEXT('',#2,'mechanical');
+#9 = PRODUCT_DEFINITION_CONTEXT('part definition',#2,'design');
+#10 = ADVANCED_BREP_SHAPE_REPRESENTATION('',(#11,#15),#107);
+#11 = AXIS2_PLACEMENT_3D('',#12,#13,#14);
+#12 = CARTESIAN_POINT('',(0.,0.,0.));
+#13 = DIRECTION('',(0.,0.,1.));
+#14 = DIRECTION('',(1.,0.,-0.));
+#15 = MANIFOLD_SOLID_BREP('',#16);
+#16 = CLOSED_SHELL('',(#17,#50,#70,#90));
+#17 = ADVANCED_FACE('',(#18),#45,.T.);
+#18 = FACE_BOUND('',#19,.T.);
+#19 = EDGE_LOOP('',(#20,#29,#37,#44));
+#20 = ORIENTED_EDGE('',*,*,#21,.F.);
+#21 = EDGE_CURVE('',#22,#22,#24,.T.);
+#22 = VERTEX_POINT('',#23);
+#23 = CARTESIAN_POINT('',(4.5,-1.102182119233E-15,0.5));
+#24 = CIRCLE('',#25,4.5);
+#25 = AXIS2_PLACEMENT_3D('',#26,#27,#28);
+#26 = CARTESIAN_POINT('',(0.,0.,0.5));
+#27 = DIRECTION('',(0.,0.,1.));
+#28 = DIRECTION('',(1.,0.,-0.));
+#29 = ORIENTED_EDGE('',*,*,#30,.F.);
+#30 = EDGE_CURVE('',#31,#22,#33,.T.);
+#31 = VERTEX_POINT('',#32);
+#32 = CARTESIAN_POINT('',(4.5,-1.102182119233E-15,0.));
+#33 = LINE('',#34,#35);
+#34 = CARTESIAN_POINT('',(4.5,-1.102182119233E-15,0.));
+#35 = VECTOR('',#36,1.);
+#36 = DIRECTION('',(0.,0.,1.));
+#37 = ORIENTED_EDGE('',*,*,#38,.T.);
+#38 = EDGE_CURVE('',#31,#31,#39,.T.);
+#39 = CIRCLE('',#40,4.5);
+#40 = AXIS2_PLACEMENT_3D('',#41,#42,#43);
+#41 = CARTESIAN_POINT('',(0.,0.,0.));
+#42 = DIRECTION('',(0.,0.,1.));
+#43 = DIRECTION('',(1.,0.,-0.));
+#44 = ORIENTED_EDGE('',*,*,#30,.T.);
+#45 = CYLINDRICAL_SURFACE('',#46,4.5);
+#46 = AXIS2_PLACEMENT_3D('',#47,#48,#49);
+#47 = CARTESIAN_POINT('',(0.,0.,0.));
+#48 = DIRECTION('',(0.,0.,1.));
+#49 = DIRECTION('',(1.,0.,-0.));
+#50 = ADVANCED_FACE('',(#51,#54),#65,.T.);
+#51 = FACE_BOUND('',#52,.T.);
+#52 = EDGE_LOOP('',(#53));
+#53 = ORIENTED_EDGE('',*,*,#21,.T.);
+#54 = FACE_BOUND('',#55,.T.);
+#55 = EDGE_LOOP('',(#56));
+#56 = ORIENTED_EDGE('',*,*,#57,.F.);
+#57 = EDGE_CURVE('',#58,#58,#60,.T.);
+#58 = VERTEX_POINT('',#59);
+#59 = CARTESIAN_POINT('',(2.25,-5.510910596163E-16,0.5));
+#60 = CIRCLE('',#61,2.25);
+#61 = AXIS2_PLACEMENT_3D('',#62,#63,#64);
+#62 = CARTESIAN_POINT('',(0.,0.,0.5));
+#63 = DIRECTION('',(0.,0.,1.));
+#64 = DIRECTION('',(1.,0.,-0.));
+#65 = PLANE('',#66);
+#66 = AXIS2_PLACEMENT_3D('',#67,#68,#69);
+#67 = CARTESIAN_POINT('',(0.,0.,0.5));
+#68 = DIRECTION('',(0.,0.,1.));
+#69 = DIRECTION('',(1.,0.,-0.));
+#70 = ADVANCED_FACE('',(#71,#74),#85,.F.);
+#71 = FACE_BOUND('',#72,.F.);
+#72 = EDGE_LOOP('',(#73));
+#73 = ORIENTED_EDGE('',*,*,#38,.T.);
+#74 = FACE_BOUND('',#75,.F.);
+#75 = EDGE_LOOP('',(#76));
+#76 = ORIENTED_EDGE('',*,*,#77,.F.);
+#77 = EDGE_CURVE('',#78,#78,#80,.T.);
+#78 = VERTEX_POINT('',#79);
+#79 = CARTESIAN_POINT('',(2.25,-5.510910596163E-16,0.));
+#80 = CIRCLE('',#81,2.25);
+#81 = AXIS2_PLACEMENT_3D('',#82,#83,#84);
+#82 = CARTESIAN_POINT('',(0.,0.,0.));
+#83 = DIRECTION('',(0.,0.,1.));
+#84 = DIRECTION('',(1.,0.,-0.));
+#85 = PLANE('',#86);
+#86 = AXIS2_PLACEMENT_3D('',#87,#88,#89);
+#87 = CARTESIAN_POINT('',(0.,0.,0.));
+#88 = DIRECTION('',(0.,0.,1.));
+#89 = DIRECTION('',(1.,0.,-0.));
+#90 = ADVANCED_FACE('',(#91),#102,.F.);
+#91 = FACE_BOUND('',#92,.F.);
+#92 = EDGE_LOOP('',(#93,#94,#100,#101));
+#93 = ORIENTED_EDGE('',*,*,#57,.F.);
+#94 = ORIENTED_EDGE('',*,*,#95,.F.);
+#95 = EDGE_CURVE('',#78,#58,#96,.T.);
+#96 = LINE('',#97,#98);
+#97 = CARTESIAN_POINT('',(2.25,-5.510910596163E-16,-1.E-02));
+#98 = VECTOR('',#99,1.);
+#99 = DIRECTION('',(0.,0.,1.));
+#100 = ORIENTED_EDGE('',*,*,#77,.T.);
+#101 = ORIENTED_EDGE('',*,*,#95,.T.);
+#102 = CYLINDRICAL_SURFACE('',#103,2.25);
+#103 = AXIS2_PLACEMENT_3D('',#104,#105,#106);
+#104 = CARTESIAN_POINT('',(0.,0.,-1.E-02));
+#105 = DIRECTION('',(0.,0.,1.));
+#106 = DIRECTION('',(1.,0.,-0.));
+#107 = ( GEOMETRIC_REPRESENTATION_CONTEXT(3) 
+GLOBAL_UNCERTAINTY_ASSIGNED_CONTEXT((#111)) GLOBAL_UNIT_ASSIGNED_CONTEXT
+((#108,#109,#110)) REPRESENTATION_CONTEXT('Context #1',
+  '3D Context with UNIT and UNCERTAINTY') );
+#108 = ( LENGTH_UNIT() NAMED_UNIT(*) SI_UNIT(.MILLI.,.METRE.) );
+#109 = ( NAMED_UNIT(*) PLANE_ANGLE_UNIT() SI_UNIT($,.RADIAN.) );
+#110 = ( NAMED_UNIT(*) SI_UNIT($,.STERADIAN.) SOLID_ANGLE_UNIT() );
+#111 = UNCERTAINTY_MEASURE_WITH_UNIT(LENGTH_MEASURE(1.E-07),#108,
+  'distance_accuracy_value','confusion accuracy');
+#112 = PRODUCT_RELATED_PRODUCT_CATEGORY('part',$,(#7));
+ENDSEC;
+END-ISO-10303-21;

models/encoder_shared76_print_v1/Shim10.step

@@ -0,0 +1,128 @@
+ISO-10303-21;
+HEADER;
+FILE_DESCRIPTION(('FreeCAD Model'),'2;1');
+FILE_NAME('Open CASCADE Shape Model','2026-10-28T10:41:16',(''),(''),
+  'Open CASCADE STEP processor 7.8','FreeCAD','Unknown');
+FILE_SCHEMA(('AUTOMOTIVE_DESIGN { 1 0 10303 214 1 1 1 1 }'));
+ENDSEC;
+DATA;
+#1 = APPLICATION_PROTOCOL_DEFINITION('international standard',
+  'automotive_design',2000,#2);
+#2 = APPLICATION_CONTEXT(
+  'core data for automotive mechanical design processes');
+#3 = SHAPE_DEFINITION_REPRESENTATION(#4,#10);
+#4 = PRODUCT_DEFINITION_SHAPE('','',#5);
+#5 = PRODUCT_DEFINITION('design','',#6,#9);
+#6 = PRODUCT_DEFINITION_FORMATION('','',#7);
+#7 = PRODUCT('M4 shim 1mm','M4 shim 1mm','',(#8));
+#8 = PRODUCT_CONTEXT('',#2,'mechanical');
+#9 = PRODUCT_DEFINITION_CONTEXT('part definition',#2,'design');
+#10 = ADVANCED_BREP_SHAPE_REPRESENTATION('',(#11,#15),#107);
+#11 = AXIS2_PLACEMENT_3D('',#12,#13,#14);
+#12 = CARTESIAN_POINT('',(0.,0.,0.));
+#13 = DIRECTION('',(0.,0.,1.));
+#14 = DIRECTION('',(1.,0.,-0.));
+#15 = MANIFOLD_SOLID_BREP('',#16);
+#16 = CLOSED_SHELL('',(#17,#50,#70,#90));
+#17 = ADVANCED_FACE('',(#18),#45,.T.);
+#18 = FACE_BOUND('',#19,.T.);
+#19 = EDGE_LOOP('',(#20,#29,#37,#44));
+#20 = ORIENTED_EDGE('',*,*,#21,.F.);
+#21 = EDGE_CURVE('',#22,#22,#24,.T.);
+#22 = VERTEX_POINT('',#23);
+#23 = CARTESIAN_POINT('',(4.5,-1.102182119233E-15,1.));
+#24 = CIRCLE('',#25,4.5);
+#25 = AXIS2_PLACEMENT_3D('',#26,#27,#28);
+#26 = CARTESIAN_POINT('',(0.,0.,1.));
+#27 = DIRECTION('',(0.,0.,1.));
+#28 = DIRECTION('',(1.,0.,-0.));
+#29 = ORIENTED_EDGE('',*,*,#30,.F.);
+#30 = EDGE_CURVE('',#31,#22,#33,.T.);
+#31 = VERTEX_POINT('',#32);
+#32 = CARTESIAN_POINT('',(4.5,-1.102182119233E-15,0.));
+#33 = LINE('',#34,#35);
+#34 = CARTESIAN_POINT('',(4.5,-1.102182119233E-15,0.));
+#35 = VECTOR('',#36,1.);
+#36 = DIRECTION('',(0.,0.,1.));
+#37 = ORIENTED_EDGE('',*,*,#38,.T.);
+#38 = EDGE_CURVE('',#31,#31,#39,.T.);
+#39 = CIRCLE('',#40,4.5);
+#40 = AXIS2_PLACEMENT_3D('',#41,#42,#43);
+#41 = CARTESIAN_POINT('',(0.,0.,0.));
+#42 = DIRECTION('',(0.,0.,1.));
+#43 = DIRECTION('',(1.,0.,-0.));
+#44 = ORIENTED_EDGE('',*,*,#30,.T.);
+#45 = CYLINDRICAL_SURFACE('',#46,4.5);
+#46 = AXIS2_PLACEMENT_3D('',#47,#48,#49);
+#47 = CARTESIAN_POINT('',(0.,0.,0.));
+#48 = DIRECTION('',(0.,0.,1.));
+#49 = DIRECTION('',(1.,0.,-0.));
+#50 = ADVANCED_FACE('',(#51,#54),#65,.T.);
+#51 = FACE_BOUND('',#52,.T.);
+#52 = EDGE_LOOP('',(#53));
+#53 = ORIENTED_EDGE('',*,*,#21,.T.);
+#54 = FACE_BOUND('',#55,.T.);
+#55 = EDGE_LOOP('',(#56));
+#56 = ORIENTED_EDGE('',*,*,#57,.F.);
+#57 = EDGE_CURVE('',#58,#58,#60,.T.);
+#58 = VERTEX_POINT('',#59);
+#59 = CARTESIAN_POINT('',(2.25,-5.510910596163E-16,1.));
+#60 = CIRCLE('',#61,2.25);
+#61 = AXIS2_PLACEMENT_3D('',#62,#63,#64);
+#62 = CARTESIAN_POINT('',(0.,0.,1.));
+#63 = DIRECTION('',(0.,0.,1.));
+#64 = DIRECTION('',(1.,0.,-0.));
+#65 = PLANE('',#66);
+#66 = AXIS2_PLACEMENT_3D('',#67,#68,#69);
+#67 = CARTESIAN_POINT('',(0.,0.,1.));
+#68 = DIRECTION('',(0.,0.,1.));
+#69 = DIRECTION('',(1.,0.,-0.));
+#70 = ADVANCED_FACE('',(#71,#74),#85,.F.);
+#71 = FACE_BOUND('',#72,.F.);
+#72 = EDGE_LOOP('',(#73));
+#73 = ORIENTED_EDGE('',*,*,#38,.T.);
+#74 = FACE_BOUND('',#75,.F.);
+#75 = EDGE_LOOP('',(#76));
+#76 = ORIENTED_EDGE('',*,*,#77,.F.);
+#77 = EDGE_CURVE('',#78,#78,#80,.T.);
+#78 = VERTEX_POINT('',#79);
+#79 = CARTESIAN_POINT('',(2.25,-5.510910596163E-16,0.));
+#80 = CIRCLE('',#81,2.25);
+#81 = AXIS2_PLACEMENT_3D('',#82,#83,#84);
+#82 = CARTESIAN_POINT('',(0.,0.,0.));
+#83 = DIRECTION('',(0.,0.,1.));
+#84 = DIRECTION('',(1.,0.,-0.));
+#85 = PLANE('',#86);
+#86 = AXIS2_PLACEMENT_3D('',#87,#88,#89);
+#87 = CARTESIAN_POINT('',(0.,0.,0.));
+#88 = DIRECTION('',(0.,0.,1.));
+#89 = DIRECTION('',(1.,0.,-0.));
+#90 = ADVANCED_FACE('',(#91),#102,.F.);
+#91 = FACE_BOUND('',#92,.F.);
+#92 = EDGE_LOOP('',(#93,#94,#100,#101));
+#93 = ORIENTED_EDGE('',*,*,#57,.F.);
+#94 = ORIENTED_EDGE('',*,*,#95,.F.);
+#95 = EDGE_CURVE('',#78,#58,#96,.T.);
+#96 = LINE('',#97,#98);
+#97 = CARTESIAN_POINT('',(2.25,-5.510910596163E-16,-1.E-02));
+#98 = VECTOR('',#99,1.);
+#99 = DIRECTION('',(0.,0.,1.));
+#100 = ORIENTED_EDGE('',*,*,#77,.T.);
+#101 = ORIENTED_EDGE('',*,*,#95,.T.);
+#102 = CYLINDRICAL_SURFACE('',#103,2.25);
+#103 = AXIS2_PLACEMENT_3D('',#104,#105,#106);
+#104 = CARTESIAN_POINT('',(0.,0.,-1.E-02));
+#105 = DIRECTION('',(0.,0.,1.));
+#106 = DIRECTION('',(1.,0.,-0.));
+#107 = ( GEOMETRIC_REPRESENTATION_CONTEXT(3) 
+GLOBAL_UNCERTAINTY_ASSIGNED_CONTEXT((#111)) GLOBAL_UNIT_ASSIGNED_CONTEXT
+((#108,#109,#110)) REPRESENTATION_CONTEXT('Context #1',
+  '3D Context with UNIT and UNCERTAINTY') );
+#108 = ( LENGTH_UNIT() NAMED_UNIT(*) SI_UNIT(.MILLI.,.METRE.) );
+#109 = ( NAMED_UNIT(*) PLANE_ANGLE_UNIT() SI_UNIT($,.RADIAN.) );
+#110 = ( NAMED_UNIT(*) SI_UNIT($,.STERADIAN.) SOLID_ANGLE_UNIT() );
+#111 = UNCERTAINTY_MEASURE_WITH_UNIT(LENGTH_MEASURE(1.E-07),#108,
+  'distance_accuracy_value','confusion accuracy');
+#112 = PRODUCT_RELATED_PRODUCT_CATEGORY('part',$,(#7));
+ENDSEC;
+END-ISO-10303-21;

models/encoder_shared76_print_v1/geometry_check.txt

@@ -0,0 +1,5 @@
+Nominal gap 1.4mm: 7mm standoff body, 0.8mm motor washer, 0.5mm encoder shim.
+M4 male 8mm; through 3mm angle and 0.8mm metal washer, nominal motor engagement 4.2mm.
+M4 top shank 8mm through 0.8mm top washer + 3.2mm bracket + 0.5mm shim, female entry 3.5mm.
+Intersections above 0.001 mm3, selected complete simplified assembly pairs:
+none

models/encoder_shared76_print_v1/mesh_check.txt

@@ -0,0 +1,3 @@
+EncoderBracket solid=True facets=4292 volume=10157.0049 zmin=0.0000
+Shim05 solid=True facets=260 volume=23.7834 zmin=0.0000
+Shim10 solid=True facets=260 volume=47.5667 zmin=0.0000

models/encoder_shared76_print_v1/打印与装配说明.md

@@ -0,0 +1,46 @@
+# PCD 76 mm 共孔编码器支架：首版试装件
+
+本目录为依现有电机与编码器近似模型制作的打印试装件。角码直接贴住电机，由金属立柱和金属垫圈先独立锁紧，塑料支架位于柱另一端，只固定编码器。原电机及原磁铁座文件未修改。
+
+## 打印文件
+
+| 文件 | 数量 | 说明 |
+| --- | --- | --- |
+| `EncoderBracket.stl` | 1 | 64 × 64 × 3.2 mm 方框，四角朝左右两侧外开口 |
+| `Shim05.stl` | 4，建议多备 | 每片 0.5 mm，放在柱顶和塑料支架之间 |
+| `Shim10.stl` | 4，备用 | 每片 1.0 mm，用于调整芯片与磁铁的间距 |
+
+STL 已按打印底面放置在 Z=0。支架平放打印；开口和竖直孔无需额外建模支撑，最终以切片预览为准。建议 PETG、0.2 mm 层高、至少 3 道外墙。0.5 mm 垫片建议采用 0.1 mm 层高、避免切片把厚度四舍五入，并检查翘曲。模型中的开口宽 4.6 mm；FDM 孔和开口尺寸会受设备与材料影响，先试放 M4 螺杆。
+
+`Shared76_Print.FCStd` 为打印朝向零件，三个对象在同一原点，需在树中分别选择或直接使用单独 STL；`EncoderBracket.step` 和 `Shim*.step` 是单件交换文件。`Shared76_Assembly.FCStd`、`.step` 为装配核查模型。实体由脚本生成，几何不是尺寸表驱动的参数化草图；重建使用 `scripts/rebuild_shared76_print.FCMacro`，会覆盖本目录相关输出。
+
+## 五金及假设
+
+- 四个角码：按 20 × 20 × 18 mm、3 mm 厚模型，椭圆槽按 9.5 × 5.5 mm 假设。PCD 76 mm 四孔及 45° 相位沿用现有电机模型，须按实物确认。
+- 四根金属 M4 公母柱：模型采用**柱身 7 mm、公牙 8 mm、六角对边 7 mm**，角码表面再垫 0.8 mm 金属平垫圈，金属柱先压紧角码。可参考 [Würth Elektronik 971070471 数据表](https://www.we-online.com/components/products/datasheet/971xx0xx1.pdf) 的规格：钢镀锌、M4、公牙 8 mm、柱身 7 mm、母牙深 4.5 mm。此为尺寸参考，厂家未声明其适合方向盘电机主固定；必须确认实际柱件、足够强度、螺纹和锁紧情况。
+- 电机侧在上述假设下理论进牙 `8 − 3 − 0.8 = 4.2 mm`，真实垫圈厚度、角码厚度、螺纹深度和有效咬合均须核实；不要让螺纹顶到底。
+- 每个塑料支架脚用一个独立顶部 M4 螺丝及约外径 9 mm、厚 0.8 mm 金属垫圈。模型按支架厚 3.2 mm、每脚 0.5 mm 调整垫片，顶部 M4×8 理论进入柱内 `8 − 3.2 − 0.5 − 0.8 = 3.5 mm`。如采用参考柱 4.5 mm 女牙深，理论比底部留 1 mm；实际孔深、螺丝、垫圈与垫片必须逐个核实，确保不顶底且有足够进牙。其他立柱规格或调整垫片组合需重算。手头 M4×8 只能作为顶部候选，不能替代角码所需的公母柱。
+- PCB 采用 Ø33 mm、3 个 Ø3 mm 孔，板厚 1.6 mm、芯片突出 0.8 mm 均为假设；三颗 M2×4 mm 小自攻螺丝从芯片面穿原孔拧入支架 Ø1.8 mm 导孔，假设头部 Ø4 × 1.5 mm。先手工试配，不要强拧。PCB 背面通过中央开孔留给焊点和导线；实际元件和线材形状未知，需试放。
+- 磁铁座沿用 `models/encoder_print_v1/MagnetHolder.stl`，适配现有 Ø10 × 3 mm 径向充磁磁铁；不需要重新打印，除非原件不合适。
+
+## 磁铁间隙如何调整
+
+每个金属柱顶部、塑料支架底部放 **完全等厚** 的打印调整垫片，调整时不松动固定角码的金属柱。以下按 3 mm 角码、0.8 mm 金属垫圈、7 mm 柱身、1.6 mm PCB 和 0.8 mm 芯片高度估算，均为名义值：
+
+| 每脚垫片 | 芯片表面至磁铁表面的名义间隙 | 顶部 M4×8、0.8 mm 金属垫圈时理论进柱 |
+| --- | --- | --- |
+| 无 | 0.9 mm | 4.0 mm |
+| 0.5 mm | 1.4 mm | 3.5 mm |
+| 1 mm | 1.9 mm | 3.0 mm |
+| 1 + 0.5 mm | 2.4 mm | 2.5 mm |
+
+首先每脚放 0.5 mm 垫片。更换为 1 mm 会增大间隙；取掉垫片会减小间隙。每次都要重新核对顶部螺丝的进牙和孔底余量；例如参考柱女牙深 4.5 mm，**无垫片**时名义 4.0 mm 进牙只余 0.5 mm，公差下可能顶底。四处垫片厚度不能不同，否则 PCB 可能倾斜。实际芯片突出高度未测，真实间隙不是表中保证值；断电手动转几圈检查无碰擦，再检查角度和磁场状态。
+
+## 装配顺序
+
+1. 先将 PCB 正对磁铁的一面朝向电机，三颗 M2 自攻螺丝在拆下的支架上轻拧固定；孔留有微调余量，对准磁铁中心后再适度锁紧。检查板背焊点、PCB 元件与框架不压线。
+2. 角码直接贴在电机四个 76 mm 孔处；每孔放金属垫圈，用适合的公母柱独立锁紧角码。此时不装塑料支架在电机和角码之间。
+3. 四个柱顶各放一片同厚调整垫片，沿电机轴向摆放支架，分别装顶部 M4 螺丝及金属垫圈。四个开口左右相反，不能假定四颗螺丝预装后可整体单向侧滑装拆。顶部螺丝的实际工具空间和与 2020 型材/T 型螺母的关系尚未建模验证。
+4. 断电缓慢手转电机至少几圈，确认磁铁座、PCB、支架及线材不擦碰；再检查编码器数值和磁场。测试前确认四个角码及两侧型材可靠固定，编码器塑料支架不能承担这些力。
+
+`mesh_check.txt` 记录 STL 网格闭合、体积及打印 Z 范围；`geometry_check.txt` 是近似总装静态布尔检查。实际角码、螺丝工具、焊线、磁场和动力载荷均未实物验证。