BUTT SCHEDULE CALCULATOR

TRIPLE-BUTTED WALL THICKNESS OPTIMIZER FOR 4130 CHROMOLY
INPUT PARAMETERS
CALCULATED PROFILE
SECTIONS
TRIPLE-BUTTED
CENTRE WALL THICKNESS
-- mm
TRANSITION WALL THICKNESS
-- mm
END WALL THICKNESS
-- mm
PREDICTED WEIGHT
-- g
STIFFNESS RATIO ACHIEVED
--×

ENGINEERING BASIS

I = π/64 × (OD⁴ − ID⁴)
w = ρ × π × (OD² − ID²) × L / 4

Moment of inertia drives bending stiffness. Weight scales with annular area.
Triple-butting preserves end-joint integrity while starving centre mass.
All calculations assume ASTM A4130 chromoly density: 7.85 g/cm³

SOURCE: Wikidata Q1070521 (alloy-steel) • Q167130 (bicycle-frame) • ASTM A4130 SPECIFICATION
IMPLEMENTATION: ANTHONY-LARGE • GARWIN, IOWA • 41°37′N 92°45′W
Outer Diameter Boundary
Calculated Inner Profile
Stack of curved steel pipes in fabrication facility Stainless steel tubing rods in workshop lighting Black steel bicycle frames hanging in Amsterdam workshop Welder torch creating orbital joint on bicycle frame

VERSION HISTORY

v1.0 — Initial release. Triple-butted profile solver using polar moment of inertia optimization. Grounded in alloy-steel (Q1070521) and bicycle-frame (Q167130) ontologies. Origin: Tama County bedrock.