建立方向盘项目初始版本
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scripts/build_pcd50_pillar_concept.py
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159
scripts/build_pcd50_pillar_concept.py
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"""Closed-bore pillar concept for M9C12 / MT6826S; NOT a print-ready part.
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Run with FreeCAD GUI via rebuild_pcd50_pillar_concept.FCMacro. The existing
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models are input only. All nominal dimensions and limitations are in the report.
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"""
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from pathlib import Path
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import math, time, traceback
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import FreeCAD as A, FreeCADGui as G, Part, Import
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from pivy import coin
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R=Path(__file__).resolve().parent.parent
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O=R/'models'/'pcd50_pillar_concept'; O.mkdir(parents=True,exist_ok=True)
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V=A.Vector
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def cy(r,h,x,y,z): return Part.makeCylinder(r,h,V(x,y,z))
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def add(d,n,label,s,c,t=0):
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o=d.addObject('PartDesign::Feature',n);o.Label=label;o.Shape=s
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o.ViewObject.ShapeColor=c;o.ViewObject.LineColor=(.1,.1,.1);o.ViewObject.Transparency=t
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return o
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try:
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src=A.openDocument(str(R/'models'/'pcd50_fit_concept'/'PCD50_Assembly.FCStd'))
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names=['Motor','Holder','Magnet','PCB','Chip']+['PCBHead%d'%i for i in range(1,4)]+['Corner%d'%i for i in range(4)]+['Rail%d'%i for i in range(2)]
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sh={n:src.getObject(n).Shape.copy() for n in names}
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old=src.getObject('OpenBracket').Shape.copy()
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A.closeDocument(src.Name)
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# PCD50 source uses corner offset +2.0mm; move 0.5mm farther out.
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for n in ['Corner%d'%i for i in range(4)]+['Rail%d'%i for i in range(2)]:
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c=(sh[n].BoundBox.XMin+sh[n].BoundBox.XMax)/2
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sh[n].translate(V(.5 if c>0 else -.5,0,0))
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pts=[(25*math.cos(math.radians(45+90*i)),25*math.sin(math.radians(45+90*i))) for i in range(4)]
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# Rebuild a complete panel rather than inherit the prior U-slot tool gaps.
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# Preserve the original three PCB pads, not its open 50mm fastener ears.
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pcbpads=old.common(Part.makeBox(120,120,3.2,V(-60,-60,10.9)))
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panel=Part.makeBox(49,49,3.2,V(-24.5,-24.5,10.9)).cut(cy(16.8,3.22,0,0,10.89)).fuse(pcbpads)
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p76=38/math.sqrt(2)
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for sx in (-1,1):
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for sy in (-1,1):panel=panel.cut(cy(5.2,3.24,sx*p76,sy*p76,10.88))
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columns=[]; cutters=[]
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for i in range(4):
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bb=sh['Corner%d'%i].BoundBox
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cutters.append(Part.makeBox(bb.XLength+.4,bb.YLength+.4,3.22,V(bb.XMin-.2,bb.YMin-.2,-.01)))
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bracket=panel
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for x,y in pts:
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# Carry each column through the panel thickness so the screw head bears on
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# a complete closed ring rather than hanging over the old open-panel slot.
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col=cy(4.5,13.6,x,y,.5)
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for cut in cutters:col=col.cut(cut)
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bracket=bracket.fuse(col)
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for x,y in pts:bracket=bracket.cut(cy(2.2,13.8,x,y,.4))
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bracket=bracket.removeSplitter()
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if bracket.isNull() or not bracket.isValid() or len(bracket.Solids)!=1:raise RuntimeError('Invalid / disconnected closed-hole bracket')
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# Four identical nominal 0.5mm support shims, not under 76mm angle brackets.
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shims=[]
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for x,y in pts:
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s=cy(4.5,.5,x,y,0).cut(cy(2.2,.52,x,y,-.01))
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for cut in cutters:s=s.cut(cut)
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s=s.removeSplitter()
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if s.isNull() or not s.isValid() or len(s.Solids)!=1:raise RuntimeError('invalid shim')
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shims.append(s)
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doc=A.newDocument('PCD50_PillarConcept');objs={}
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colors={'Motor':(.32,.34,.37),'Holder':(.98,.55,.1),'Magnet':(.8,.8,.8),'PCB':(.04,.65,.19),'Chip':(.1,.1,.1)}
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for n in names:
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c=colors.get(n,(.84,.47,.13) if n.startswith('Corner') else (.55,.56,.60) if n.startswith('Rail') else (.8,.8,.8))
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objs[n]=add(doc,n,n,sh[n],c,70 if n=='Motor' else 20 if n.startswith('Corner') else 0)
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b=add(doc,'PillarBracket','PCD50 closed-bore long pillar - conceptual',bracket,(.12,.43,.88))
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shimobjs=[add(doc,'Shim%d'%i,'PCD50 0.5mm shim - illustrative',s,(.70,.70,.75)) for i,s in enumerate(shims)]
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heads=[];shafts=[]
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for i,(x,y) in enumerate(pts):
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heads.append(add(doc,'Head50_%d'%i,'M4 head Ø7x3 assumed',cy(3.5,3,x,y,14.1),(.8,.8,.8)))
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shafts.append(add(doc,'Shaft50_%d'%i,'M4x20 illustrative - nominal 5.9mm engagement',cy(2,20,x,y,-5.9),(.8,.8,.8)))
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p=38/math.sqrt(2);mount76=[];washers76=[]
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for sx in (-1,1):
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for sy in (-1,1):
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x,y=sx*p,sy*p
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washer=cy(5,.8,x,y,3).cut(cy(2.15,.82,x,y,2.99)).removeSplitter()
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washers76.append(add(doc,'Washer76_%d'%len(washers76),'M4 washer Ø10x0.8 assumed',washer,(.75,.75,.77)))
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screw=cy(2,8,x,y,-4.2).fuse(cy(3.5,2.5,x,y,3.8)).removeSplitter()
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mount76.append(add(doc,'Mount76_%d'%len(mount76),'M4x8 angle screw conceptual',screw,(.8,.8,.8)))
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doc.recompute()
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corners=[objs['Corner%d'%i] for i in range(4)];rails=[objs['Rail%d'%i] for i in range(2)]
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pairs=[]
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for a in [b]+shimobjs+heads+shafts:
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for c in corners+rails:pairs.append((a,c))
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for a in shafts:
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for c in [b]+shimobjs:pairs.append((a,c))
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for a in mount76+washers76:
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for c in corners+rails+[b]+shimobjs+heads+shafts:pairs.append((a,c))
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for a in [b]+shimobjs+heads+shafts:
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for n in ['Motor','Holder','Magnet','PCB','Chip']+['PCBHead%d'%i for i in range(1,4)]:pairs.append((a,objs[n]))
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hits=[]
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for a,c in pairs:
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if a.Shape.BoundBox.intersect(c.Shape.BoundBox):
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vol=a.Shape.common(c.Shape).Volume
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if vol>.001:hits.append('%s / %s %.6fmm3'%(a.Name,c.Name,vol))
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# The motor-facing 50mm bores must remain complete; no side exit. Sample
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# immediately outside the bore in 72 directions at a low and high Z.
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bore=[]
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for i,(x,y) in enumerate(pts):
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for z in (1.0,13.0):
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missing=sum(not bracket.isInside(V(x+2.22*math.cos(a*math.pi/36),y+2.22*math.sin(a*math.pi/36),z),1e-7,True) for a in range(72))
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bore.append('Pillar%d z=%.1f closed-bore surrounding shell missing samples: %d/72'%(i,z,missing))
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access=[]
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for i,(x,y) in enumerate(pts):
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tool=cy(3.75,20,x,y,17.11);found=[]
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for o in [b]+corners+rails:
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if tool.BoundBox.intersect(o.Shape.BoundBox):
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v=tool.common(o.Shape).Volume
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if v>.001:found.append('%s %.4f'%(o.Name,v))
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access.append('M4 tool %d: %s'%(i,', '.join(found) if found else 'no checked obstruction'))
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for sx in (-1,1):
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for sy in (-1,1):
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x,y=sx*p,sy*p;tool=cy(3.75,20,x,y,6.31);found=[]
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for o in [b]+corners+rails:
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if tool.BoundBox.intersect(o.Shape.BoundBox):
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v=tool.common(o.Shape).Volume
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if v>.001:found.append('%s %.4f'%(o.Name,v))
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access.append('76 M4 tool %+.0f,%+.0f: %s'%(sx,sy,', '.join(found) if found else 'no checked obstruction'))
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headareas=[]
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for x,y in pts:
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count=0;step=.2
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for ix in range(-18,19):
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for iy in range(-18,19):
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dx,dy=ix*step,iy*step
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if dx*dx+dy*dy<=3.5**2 and bracket.isInside(V(x+dx,y+dy,14.09),1e-7,True):count+=1
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headareas.append(count*step*step)
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report=['CONCEPT ONLY: PCD50/PCD76 phase45 and slot9.5x5.5 assumed.',
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'Corners flush to motor, moved 2.5mm outward from slot midpoint; 4mm screw nominal slot-end clearance 0.25mm.',
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'Pillars 0.5..10.9mm and panel 10.9..14.1mm; closed Ø4.4mm bore.',
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'M4x20 nominal screw engagement in motor 20 - 14.1 = 5.9mm, true tapped depth unknown.',
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'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.',
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'Minimum low-side wall near angle ~0.54mm theoretical, no print/strength guarantee.',
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'Estimated head bearing material by sampling (mm2): '+', '.join('%.2f'%x for x in headareas),
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'Selected positive-volume intersections >0.001mm3:']+(hits or ['none'])+['Tool envelope Ø7.5:']+access+['Low-bore shell check (positive shell is expected):']+bore
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(O/'geometry_check.txt').write_text('\n'.join(report)+'\n',encoding='utf8')
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G.activateWorkbench('PartWorkbench');view=G.activeDocument().activeView()
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def render(top,path):
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if top:view.viewTop()
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else:
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view.viewAxonometric();G.updateGui();time.sleep(.5)
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view.getCameraNode().orientation.setValue(coin.SbRotation(.880476,.115917,-.279848,-.364705))
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G.updateGui();time.sleep(.8);view.fitAll();G.updateGui();time.sleep(.8);G.updateGui();view.saveImage(str(O/path),1600,1200,'White')
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render(True,'rear.png');render(False,'assembly.png')
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states={o.Name:o.ViewObject.Visibility for o in doc.Objects if hasattr(o,'Shape')}
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for o in doc.Objects:
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if hasattr(o,'Shape'):o.ViewObject.Visibility=False
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b.ViewObject.Visibility=True;render(False,'bracket.png')
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# Remove the outer half of the two upper pillars to show the bore cross
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# section, then discard this object before saving the actual assembly.
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b.ViewObject.Visibility=False
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section=bracket.cut(Part.makeBox(120,60,25,V(-60,-60-25/math.sqrt(2),0))).removeSplitter()
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sectionobj=add(doc,'SectionPreview','Half section for illustration only',section,(.12,.43,.88))
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doc.recompute();render(False,'section.png');doc.removeObject(sectionobj.Name)
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for o in doc.Objects:
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if hasattr(o,'Shape'):o.ViewObject.Visibility=states[o.Name]
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render(False,'assembly.png');doc.recompute();doc.saveAs(str(O/'PCD50_Pillar_Assembly.FCStd'))
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Import.export([o for o in doc.Objects if hasattr(o,'Shape')],str(O/'PCD50_Pillar_Assembly.step'))
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(O/'DONE.txt').write_text('ok\n',encoding='utf8')
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except Exception:
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(O/'ERROR.txt').write_text(traceback.format_exc(),encoding='utf8');raise
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