Initial commit: Feldbett Design-Dokumentation und FreeCAD-Scripts
Modulares Schwergewicht-Feldbett aus Alu-Rohren (25×1.5) mit Stahl-Konnektoren (33.7×2.5). Design-Docs, Materialrecherche, Gewichtsberechnung, Korrosionsschutz-Analyse, und zwei getestete FreeCAD-Makros (Struktur + Konnektoren-Detail). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Axel Meyer
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scripts/original/feldbett.py
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260
scripts/original/feldbett.py
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"""
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Feldbett Konstruktion - FreeCAD Python Script
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=============================================
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Ausführen in FreeCAD: Menü → Makro → Makro ausführen → diese Datei wählen
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Koordinatensystem:
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X = Längsrichtung (Liegeachse)
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Y = Höhe
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Z = Querrichtung (Breite)
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Struktur:
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A = Längsstangen (2x, durchgehend, Z=±hwA, Y=totalH)
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Q = Querstreben (3x, quer in Z, kürzer als Breite, Y=legH)
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D = Diagonalen (12x, A-Knoten → Q-Ende, 3D-diagonal)
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B = Beine (12x, Q-Ende → Bodenknoten, gespiegelt zu D)
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F = Füße (kurze senkrechte Stücke unter Bodenknoten)
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"""
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import FreeCAD as App
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import FreeCADGui as Gui
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import Part
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import math
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# ============================================================
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# PARAMETER — hier anpassen
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# ============================================================
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L = 35.0 # Stangenlänge [mm] — ALLE Stangen gleich lang
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BREITE_AA = 70.0 # Abstand zwischen den zwei Längsstangen (A–A) [mm]
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MODULE = 3 # Anzahl Module
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# Rohr-Parameter
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ROHR_DA = 25.0 # Außendurchmesser Rohr [mm]
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ROHR_WAND = 2.0 # Wandstärke [mm]
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FUSS_LAENGE = 10.0 # Länge der Fußstücke nach unten [mm]
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# Farben (R, G, B) je 0.0–1.0
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FARBE_A = (0.20, 0.45, 0.75) # blau
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FARBE_D = (0.06, 0.43, 0.34) # grün
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FARBE_Q = (0.73, 0.46, 0.09) # amber
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FARBE_B = (0.42, 0.25, 0.63) # lila
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FARBE_F = (0.50, 0.50, 0.50) # grau
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# ============================================================
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# BERECHNETE GEOMETRIE
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# ============================================================
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hwA = BREITE_AA / 2.0 # halbe Breite A–A
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hwQ = L / 2.0 # halbe Q-Länge (Q = L lang)
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dZ = hwA - hwQ # Z-Einzug von A nach Q
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legH2 = 0.75 * L**2 - dZ**2
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if legH2 <= 0:
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raise ValueError(
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f"Geometrie unmöglich: L={L} zu kurz für Breite={BREITE_AA}. "
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f"Mindest-L = {math.sqrt(dZ**2/0.75 + dZ**2/0.75*0.25):.1f} mm"
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)
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legH = math.sqrt(legH2) # Höhe einer Ebene (A→Q oder Q→Boden)
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totalH = 2.0 * legH # Gesamthöhe
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step = 2.0 * L # Abstand Modul-zu-Modul (inkl. Lücke)
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aEnd = (MODULE - 1) * step + L # X-Ende der Längsstangen
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# Kontrollrechnung D-Länge
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dLen = math.sqrt((L/2)**2 + legH**2 + dZ**2)
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print("=" * 50)
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print("FELDBETT GEOMETRIE")
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print("=" * 50)
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print(f" Stangenlänge L = {L:.1f} mm")
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print(f" Breite A–A = {BREITE_AA:.1f} mm")
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print(f" Q-Länge = {L:.1f} mm (= L ✓)")
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print(f" Liegelänge (A-Ende) = {aEnd:.1f} mm")
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print(f" Höhe gesamt = {totalH:.1f} mm")
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print(f" legH (pro Ebene) = {legH:.2f} mm")
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print(f" D/B-Länge = {dLen:.2f} mm (sollte = {L:.1f})")
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print(f" Module = {MODULE}")
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print(f" Rohr DA/Wand = {ROHR_DA}/{ROHR_WAND} mm")
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print()
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# ============================================================
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# HILFSFUNKTIONEN
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# ============================================================
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ROHR_DI = ROHR_DA - 2.0 * ROHR_WAND # Innendurchmesser
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def make_tube(p1, p2, label, color):
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"""
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Erzeugt ein Hohlrohr von Punkt p1 nach p2.
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p1, p2: FreeCAD.Vector
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"""
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direction = p2 - p1
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length = direction.Length
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if length < 0.01:
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return None
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# Außenzylinder
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outer = Part.makeCylinder(ROHR_DA / 2.0, length)
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# Innenzylinder (Hohlraum)
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inner = Part.makeCylinder(ROHR_DI / 2.0, length)
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tube = outer.cut(inner)
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# Ausrichten: Zylinder liegt standardmäßig entlang Z-Achse
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# → Rotation auf Zielrichtung
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z_axis = App.Vector(0, 0, 1)
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norm_dir = direction.normalize()
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cross = z_axis.cross(norm_dir)
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dot = z_axis.dot(norm_dir)
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if cross.Length > 1e-6:
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angle = math.degrees(math.acos(max(-1.0, min(1.0, dot))))
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rot = App.Rotation(cross, angle)
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elif dot < 0:
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# 180° Rotation um beliebige Querachse
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rot = App.Rotation(App.Vector(1, 0, 0), 180)
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else:
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rot = App.Rotation()
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placement = App.Placement(p1, rot)
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tube.Placement = placement
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# FreeCAD Objekt anlegen
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obj = doc.addObject("Part::Feature", label)
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obj.Shape = tube
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# Farbe setzen
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if hasattr(obj, "ViewObject") and obj.ViewObject:
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obj.ViewObject.ShapeColor = color
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return obj
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def vec(x, y, z):
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return App.Vector(x, y, z)
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# ============================================================
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# DOKUMENT ANLEGEN
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# ============================================================
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doc_name = "Feldbett"
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if doc_name in App.listDocuments():
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App.closeDocument(doc_name)
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doc = App.newDocument(doc_name)
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# ============================================================
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# LÄNGSSTANGEN A (2x durchgehend)
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# ============================================================
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make_tube(
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vec(0, totalH, -hwA),
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vec(aEnd, totalH, -hwA),
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"A_links", FARBE_A
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)
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make_tube(
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vec(0, totalH, +hwA),
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vec(aEnd, totalH, +hwA),
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"A_rechts", FARBE_A
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)
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# ============================================================
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# MODULE
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# ============================================================
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for m in range(MODULE):
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xStart = m * step
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xAL = xStart # X linker A-Knoten
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xAR = xStart + L # X rechter A-Knoten
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xQ = xStart + L / 2 # X Mitte → Q-Position
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suffix = f"_M{m+1}"
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# --- Querstrebe Q ---
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make_tube(
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vec(xQ, legH, -hwQ),
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vec(xQ, legH, +hwQ),
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"Q" + suffix, FARBE_Q
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)
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# --- Diagonalen D (4 pro Modul) ---
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# Von A-Knoten (oben, außen) nach Q-Ende (mitte, innen)
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for side, zS in [("L", -1), ("R", +1)]:
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zA = zS * hwA
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zQe = zS * hwQ
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# linker A-Knoten → Q-Ende
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make_tube(
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vec(xAL, totalH, zA),
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vec(xQ, legH, zQe),
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f"D_xAL_{side}{suffix}", FARBE_D
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)
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# rechter A-Knoten → Q-Ende
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make_tube(
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vec(xAR, totalH, zA),
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vec(xQ, legH, zQe),
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f"D_xAR_{side}{suffix}", FARBE_D
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)
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# --- Beine B (4 pro Modul, gespiegelt zu D) ---
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for side, zS in [("L", -1), ("R", +1)]:
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zA = zS * hwA
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zQe = zS * hwQ
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# Q-Ende → linker Bodenknoten
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make_tube(
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vec(xQ, legH, zQe),
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vec(xAL, 0, zA),
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f"B_xAL_{side}{suffix}", FARBE_B
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)
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# Q-Ende → rechter Bodenknoten
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make_tube(
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vec(xQ, legH, zQe),
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vec(xAR, 0, zA),
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f"B_xAR_{side}{suffix}", FARBE_B
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)
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# --- Füße F (4 pro Modul, senkrecht nach unten) ---
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for xF in [xAL, xAR]:
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for zS in [-1, +1]:
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zA = zS * hwA
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make_tube(
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vec(xF, 0, zA),
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vec(xF, -FUSS_LAENGE, zA),
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f"F_x{int(xF)}_z{int(zA)}{suffix}", FARBE_F
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)
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# ============================================================
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# ABSCHLUSS
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# ============================================================
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doc.recompute()
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# Kamera auf Objekt ausrichten
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try:
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Gui.activeDocument().activeView().fitAll()
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Gui.SendMsgToActiveView("ViewFit")
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except Exception:
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pass
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print("Feldbett erfolgreich erstellt!")
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print(f" Objekte im Dokument: {len(doc.Objects)}")
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print()
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print("STÜCKLISTE:")
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print(f" A Längsstangen : 2 Stück à {aEnd:.0f} mm")
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print(f" Q Querstreben : {MODULE} Stück à {L:.0f} mm")
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print(f" D Diagonalen : {MODULE*4} Stück à {dLen:.1f} mm")
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print(f" B Beine : {MODULE*4} Stück à {dLen:.1f} mm")
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print(f" F Füße : {MODULE*4} Stück à {FUSS_LAENGE:.0f} mm")
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print()
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print("CONNECTOR-WINKEL:")
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alpha_AD = math.degrees(math.acos(
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abs(App.Vector(1,0,0).dot(App.Vector(L/2,-legH,-dZ).normalize()))
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))
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print(f" Connector 1 — Winkel A↔D : {alpha_AD:.1f}°")
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print(f" Connector 2 — Winkel Q↔D : 60.0°")
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print(f" Connector 2 — Winkel D↔B : 90.0°")
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