110 lines
6.2 KiB
Python
110 lines
6.2 KiB
Python
# Rebuild through rebuild_conversion_disk.FCMacro in FreeCAD's GUI to save the
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# same visibility and view as the delivered file. Running this .py directly
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# with FreeCADCmd also builds the geometry, but has no GUI view to save.
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# Rebuilding overwrites models/conversion_disk_parametric.FCStd.
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import FreeCAD as App
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import Part, Sketcher, math, pathlib
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ROOT = pathlib.Path(__file__).resolve().parent.parent
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source = ROOT / 'models' / '转换盘1.step'
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target = ROOT / 'models' / 'conversion_disk_parametric.FCStd'
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doc = App.newDocument('ConversionDisk')
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params = doc.addObject('Spreadsheet::Sheet', 'Parameters')
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params.Label = 'Parameters (mm)'
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rows = [
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('Thickness','8 mm','Plate thickness'),
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('OuterPCD','48 mm','Outer 6-hole pitch circle diameter'),
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('OuterHole','4.234 mm','Outer 6-hole diameter'),
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('CenterHole','15 mm','Center through hole diameter'),
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('InnerPCD','20 mm','Inner 8-hole pitch circle diameter'),
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('InnerHole','3 mm','Inner 8-hole diameter'),
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('RecessDiameter','28 mm','Bottom recess diameter'),
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('RecessDepth','2 mm','Bottom recess depth'),
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('OutlineScale','1','Overall outline scale relative to outer PCD'),
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('EdgeChamfer','1.5 mm','Outer edges chamfer'),
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('OuterAngle','30 deg','Outer 6-hole start angle'),
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('InnerAngle','0 deg','Inner 8-hole start angle'),
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]
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params.set('A1','Parameter'); params.set('B1','Value'); params.set('C1','Description')
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for i,(key,val,desc) in enumerate(rows,2):
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params.set('A%d'%i,key);params.set('B%d'%i,val);params.set('C%d'%i,desc);params.setAlias('B%d'%i,key)
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doc.recompute()
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reference=doc.addObject('PartDesign::Feature','OriginalReference')
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reference.Label='Original STEP reference'
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reference.Shape=Part.read(str(source))
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body=doc.addObject('PartDesign::Body','Body')
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body.Label='Conversion disk'
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def sketch(name, z=None):
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s=doc.addObject('Sketcher::SketchObject',name);body.addObject(s)
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if z is not None:
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s.Placement.Base.z=z
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s.setExpression('Placement.Base.z','Parameters.Thickness')
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return s
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def circle(s,x,y,r,exprx=None,expry=None,exprr=None):
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k=s.addGeometry(Part.Circle(App.Vector(x,y,0),App.Vector(0,0,1),r),False)
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if abs(x)<1e-8 and abs(y)<1e-8:
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s.addConstraint(Sketcher.Constraint('Coincident',k,3,-1,1))
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else:
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if abs(x)<1e-8: s.addConstraint(Sketcher.Constraint('PointOnObject',k,3,-2))
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else:
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ci=s.addConstraint(Sketcher.Constraint('DistanceX',k,3,x))
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if exprx: s.setExpression('Constraints[%d]'%ci,exprx)
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if abs(y)<1e-8: s.addConstraint(Sketcher.Constraint('PointOnObject',k,3,-1))
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else:
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ci=s.addConstraint(Sketcher.Constraint('DistanceY',k,3,y))
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if expry: s.setExpression('Constraints[%d]'%ci,expry)
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ci=s.addConstraint(Sketcher.Constraint('Radius',k,r))
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if exprr:s.setExpression('Constraints[%d]'%ci,exprr)
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def verify(obj):
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doc.recompute()
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print('CHECK',obj.Name, 'shape', obj.Shape.isNull(), 'valid', False if obj.Shape.isNull() else obj.Shape.isValid(), 'status',obj.State)
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if obj.Shape.isNull() or not obj.Shape.isValid() or 'Invalid' in obj.State:raise RuntimeError('Invalid feature '+obj.Name)
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# Preserve the true STEP mid-plane perimeter. A native link scales the whole
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# profile in XY and rotates it with the outer hole group; the individual arcs
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# are fixed source geometry rather than independently editable constraints.
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wire=max(reference.Shape.slice(App.Vector(0,0,1),4),key=lambda w:w.Length)
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face=Part.Face(wire);face.translate(App.Vector(0,0,-4))
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profile=doc.addObject('Part::Feature','OriginalOutline')
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profile.Label='Original outline at mid-thickness (reference geometry)';profile.Shape=face
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scaled=doc.addObject('App::Link','ScaledOutline');scaled.Label='Original outline - scaled and rotated'
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scaled.setLink(profile);scaled.LinkTransform=True
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scaled.setExpression('ScaleVector.x','Parameters.OuterPCD / 48 mm * Parameters.OutlineScale')
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scaled.setExpression('ScaleVector.y','Parameters.OuterPCD / 48 mm * Parameters.OutlineScale')
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scaled.setExpression('Placement.Rotation.Angle','Parameters.OuterAngle - 30 deg')
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outline=doc.addObject('Part::Extrusion','Outline');outline.Label='Original profile extruded'
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outline.Base=scaled;outline.DirMode='Custom';outline.Dir=App.Vector(0,0,1);outline.LengthFwd=8;outline.Solid=True
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outline.setExpression('LengthFwd','Parameters.Thickness');verify(outline)
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body.BaseFeature=outline;doc.recompute()
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edges=[]
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for i,e in enumerate(outline.Shape.Edges,1):
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b=e.BoundBox
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if abs(b.ZMax-b.ZMin)<1e-7 and (abs(b.ZMin)<1e-7 or abs(b.ZMin-8)<1e-7):edges.append('Edge%d'%i)
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print('CHAMFER edges',edges)
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ch=body.newObject('PartDesign::Chamfer','PerimeterChamfer');ch.Base=(ch.BaseFeature,edges);ch.Size=1.5;ch.setExpression('Size','Parameters.EdgeChamfer');verify(ch)
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recesssk=sketch('RecessProfile');circle(recesssk,0,0,14,exprr='Parameters.RecessDiameter / 2');doc.recompute()
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recess=body.newObject('PartDesign::Pocket','BottomRecess');recess.Profile=recesssk;recess.Length=2;recess.Reversed=True;recess.setExpression('Length','Parameters.RecessDepth');verify(recess)
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center=sketch('CenterProfile',8);center.Label='Center through hole'
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circle(center,0,0,7.5,exprr='Parameters.CenterHole / 2');doc.recompute()
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center_cut=body.newObject('PartDesign::Pocket','CenterHole');center_cut.Profile=center;center_cut.Length=8;center_cut.setExpression('Length','Parameters.Thickness');verify(center_cut)
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for count,pcd,r,diam,angle in [(6,'OuterPCD',2.117,'OuterHole','OuterAngle'),(8,'InnerPCD',1.5,'InnerHole','InnerAngle')]:
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holes=sketch(diam+'Profile',8);holes.Label=diam+' pattern'
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holes.setExpression('Placement.Rotation.Angle','Parameters.'+angle)
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for i in range(count):
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a=math.radians(i*360/count);c=math.cos(a);s=math.sin(a);d=24 if count==6 else 10
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circle(holes,d*c,d*s,r,'(%s) * Parameters.%s / 2'%(c,pcd),'(%s) * Parameters.%s / 2'%(s,pcd),'Parameters.%s / 2'%diam)
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doc.recompute()
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holes_cut=body.newObject('PartDesign::Pocket',diam+'Through');holes_cut.Profile=holes;holes_cut.Length=8;holes_cut.setExpression('Length','Parameters.Thickness');verify(holes_cut)
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print('FINAL volume',holes_cut.Shape.Volume,'bounds',holes_cut.Shape.BoundBox)
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doc.recompute()
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if App.GuiUp:
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import FreeCADGui as Gui
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for obj in doc.Objects:
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if obj.ViewObject:
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obj.ViewObject.Visibility = False
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body.ViewObject.Visibility = True
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holes_cut.ViewObject.Visibility = True
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Gui.activeDocument().activeView().viewAxonometric()
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Gui.activeDocument().activeView().fitAll()
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doc.saveAs(str(target))
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print('SAVED',str(target))
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