Lab / Mechanical
Beams · gears · stack-up · weld
Extra beam cases, spur-gear mesh, worst-case vs RSS tolerance, a motor curve you typed, AWS-style weld cards, and fasteners beyond tap drills.
Euler–Bernoulli, ideal mesh, handbook weld names. Not FEA, not a WPS, not a mill cert.
Section
I = bh³/12 = 4.166667e-6 m⁴