How to use
Enter neutral-surface diameters and axial height of a concentric cone or reducer. Use small diameter 0 for a full cone; download SVG/DXF.
Example calculation
D = 600, d = 300, h = 400 mm → s ≈ 427.20019 mm; Ro ≈ 854.40037 mm; Ri ≈ 427.20019 mm.
Calculation method
s = √[h² + ((D − d)/2)²] Ro = sD/(D−d); Ri = sd/(D−d) φ = 180D/Ro (degrees)
Calculation limits
Ideal concentric development. No thickness correction, weld overlap or eccentric reducer. CAD arcs are exported as true arcs.