Tool 1 · Design Stress & Pin Sizer
σ_d = σ_y / N — then size the round section
Result appears here.
Tool 2 · Fatigue Allowable (Steel)
Why fatigue, not yield, sizes rotating parts
S_e ≈ 0.5 × UTS (polished estimate) — then divide by the fatigue factor. Aluminum has NO endurance limit.
Result appears here.
Tool 3 · Recycled-Content Energy Calculator
Sustainability is procurement
Aluminum: virgin ≈ 170 MJ/kg, recycled ≈ 9 MJ/kg
Drill · Galvanic Couples: Who Corrodes?
In salt water, the more ACTIVE (less noble) metal is the anode — it sacrifices itself.