83 lines
No EOL
3.2 KiB
Python
83 lines
No EOL
3.2 KiB
Python
from build123d import *
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from ocp_vscode import show
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# ==========================================
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# --- MASTER PARAMETERS ---
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model_size = 31.0 # Outer diameter of the ring
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overhang = model_size * (3.0 / model_size) # How many mm the bolt sticks out past the ring
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# ==========================================
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# --- Derived Parameters ---
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outer_diameter = model_size
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inner_diameter = model_size * (25.4 / model_size)
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thickness = model_size * (2.3 / model_size)
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pin_diameter = model_size * (3.1 / model_size)
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pin_length = model_size * (10.8 / model_size)
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pin_spacing = model_size * (14.0 / model_size)
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pin_height_offset = model_size * (1.55 / model_size)
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fillet_radius = model_size * (0.15 / model_size)
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# --- Lightning Bolt Proportions ---
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W = (outer_diameter / 2) + overhang
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bound = model_size
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H_outer = model_size * (3.1 / model_size)
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H_inner = model_size * (0.5 / model_size)
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X_point = model_size * (5.8 / model_size)
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X_inner = model_size * (2.7 / model_size)
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with BuildPart() as opel_pin:
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# 1. Base Ring
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with BuildSketch() as ring_sketch:
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Circle(outer_diameter / 2)
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Circle(inner_diameter / 2, mode=Mode.SUBTRACT)
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extrude(amount=thickness)
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# 2. Lightning Bolt Profile (Aggressive Z-Shape)
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with BuildSketch() as bolt_sketch:
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pts = [
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(-bound, H_outer), # 1. Top-left outer edge
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(-bound, -H_inner), # 2. Bottom-left outer edge of upper bar
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(-X_inner, -H_inner), # 3. Inner bottom corner (cuts right, past center)
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(-X_point, -H_outer), # 4. Sharp bottom-left point (diagonals back left)
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(bound, -H_outer), # 5. Bottom-right outer edge
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(bound, H_inner), # 6. Top-right outer edge of lower bar
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(X_inner, H_inner), # 7. Inner top corner (cuts left, past center)
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(X_point, H_outer) # 8. Sharp top-right point (diagonals back right)
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]
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z_shape = Polygon(*pts)
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# Fillet the 2D corners of the Z shape so the inner zig-zag isn't infinitely sharp
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fillet(z_shape.vertices(), radius=fillet_radius)
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# Cleanly slice off the overhangs
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Circle(W, mode=Mode.INTERSECT)
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extrude(amount=thickness)
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# ==========================================
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# ---> THE FIX: Fillet ALL top edges <---
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# 1. Grab the highest face on the Z-axis (the newly merged face of both ring + bolt)
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top_face = opel_pin.faces().sort_by(Axis.Z)[-1]
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# 2. Grab ALL edges of that top face (no filtering)
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all_top_edges = top_face.edges()
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# 3. Apply the 3D fillet to the entire border
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fillet(all_top_edges, radius=fillet_radius)
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# ==========================================
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# 3. Mounting Pins (on the back face)
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bottom_face = opel_pin.faces().sort_by(Axis.Z)[0]
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with BuildSketch(bottom_face) as pin_sketch:
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with Locations((-pin_spacing, -pin_height_offset), (pin_spacing, pin_height_offset)):
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Circle(pin_diameter / 2)
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extrude(amount=pin_length)
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# --- Export for 3D Printing ---
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# This saves a STEP file in the same folder as your python script
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export_step(opel_pin.part, "vintage_opel_pin.step")
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# --- Send to OCP CAD Viewer ---
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show(opel_pin) |