Excel tools and guides for working engineers. Every module publishes its own validation status — including the ones not yet validated against published cases.
Tolerance stack up excel calculator — worst-case and RSS side by side, validated against published cases. Up to 25 contributors, percent-contribution chart, and pass/fail against your requirement, with the documentation fields that turn a calculation into a design record.
Excel workbook + 6-page PDF manual · Rev 1.0 covers 1-D linear stacks; GD&T bonus/MMC, 2-D/3-D loops, and Monte Carlo are on the v2 roadmap.
Get the calculator — $44 →Bolted joint analysis in Excel — preload, member stiffness, and margin of safety with thread data. Tension, shear, combined loading, and pullout across 506 formulas, with a worked example. Sources cited; validation status shown per module.
Excel calculator (8 tabs) + 22-page guide + 2-page quick reference card · Margin modules are equation-sourced from NASA RP-1228 and MIL-HDBK-5; published-case validation is on the Rev 1.1 roadmap.
Get the kit — $59 →Each tool lists the day it passes its verification gates — no batch launches, no pre-orders.
AI Toolkit for Design Engineers · FMEA Facilitation Kit (AIAG-VDA) · Design Review Kit · GD&T Field Card PRO · 3D Printing DFM Guide · Functional Safety Starter Pack · The Complete Design Toolkit
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Custom calculators and reference documents built to your standards.