Engineering tools
Free calculators, built from real production work
A growing set of practical engineering tools, built from the same calculations we use ourselves on the shop floor — not generic textbook reference charts. Free to use, with full disclaimers on each tool.
Trapezoidal Coiling Calculator
Calculates the trapezoidal wire preform dimensions needed to produce a finished rectangular-section coiled ring, with springback, Poisson and thermal corrections.
Open calculator → Spring designSpring Rate Calculator
Spring rate, deflection and stress checks for compression, extension and torsion springs from standard wire and coil geometry.
Open calculator → Wire productionWire Drawing Calculator
Area reduction, true strain and draw stress for round wire drawing — single-pass check or a full multi-pass schedule with annealing points flagged.
Open calculator → Wire productionWire Profile Rolling Calculator
Round stock to keystone (trapezoidal) section — verified area, reduction and elongation relationship, with bevel/chamfer corrections for finished retaining ring wire.
Open calculator → MachiningThread Root Relief & Dual-Index Calculator
Real thread dimensions for Metric/UN and Whitworth threads, plus a dual-index pass solution for when your insert's nose radius is smaller than the standard root radius — corrects depth without over-cutting.
Open calculator →