Spring Engine Crankshaft

Create a crankshaft for a spring engine. Single solid metal part, shaped like a bent tube with steps (zigzag profile when viewed from front). No disks, no flywheels, no bearings - just the shaft itself. Exact dimensions: - Total length: 300 mm - Tube diameter: 25.1 mm (constant throughout) - Bend height (eccentric offset): 15 mm Shape description (front view, left to right): 1. Left tail: horizontal segment on center axis, length 80 mm 2. Vertical rise: goes UP by 15 mm 3. Upper journal: horizontal segment at +15 mm height, length 40 mm (this is the left eccentric pin) 4. Vertical drop: goes DOWN by 15 mm back to center axis 5. Center section: horizontal segment on center axis, length 110 mm (this is where the rotor mounts) 6. Vertical drop: goes DOWN by 15 mm 7. Lower journal: horizontal segment at -15 mm height, length 40 mm (this is the right eccentric pin, in opposite phase to the left one) 8. Vertical rise: goes UP by 15 mm back to center axis 9. Right tail: horizontal segment on center axis, length 30 mm The two eccentric journals are in opposite phase: left one is offset UP (+15mm), right one is offset DOWN (-15mm). All transitions between segments should be smooth fillets (radius = tube radius = 12.55 mm). Material: steel, silver color. This is a single monolithic part, like a bent rod.

Parameters

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