Engineering lab
Mechanical Engineering Calculators with the Model Boundary Left Visible.
Use the tools to screen first-order feasibility, expose assumptions, and prepare the next model or test. They support preliminary engineering judgment; they do not replace complete design verification.
Tolerance Stack Calculator
Build a signed linear stack, compare worst-case and RSS limits, convert units, share a state, and export a report.
Open calculatorTOOL 02Bolt Preload + Torque Estimator
Screen installation torque, axial preload, tensile stress, and yield utilization with the T = KFd relationship.
Open calculatorTOOL 03Beam Deflection + Stress Calculator
Compare elastic stress and deflection for three common rectangular-beam load cases with explicit assumptions.
Open calculatorTOOL 04Four-Bar Linkage Explorer
Test Grashof classification, solve open or crossed position closure, and inspect live output geometry.
Open calculatorTOOL 05Thermal Fit + Clearance Calculator
Estimate bore and shaft growth at independent temperatures, then track clearance or interference through the thermal state.
Open calculatorTOOL 06Shaft Torsion + Power Calculator
Screen solid or hollow shafts for transmitted power, torque, shear stress, angle of twist, and yield margin.
Open calculatorTOOL 07Compression Spring Calculator
Estimate spring rate, force, Wahl-corrected shear stress, and coil-bind margin for a round-wire compression spring.
Open calculatorTOOL 08Pin + Clevis Joint Calculator
Screen a pin joint for average pin shear, lug bearing, clevis bearing, and the governing factor of safety.
Open calculatorRESOURCE 01Mechanical Design Review Checklist
A printable gate review covering requirements, interfaces, loads, mechanisms, tolerances, production, validation, and release evidence.
Open checklistVerification register · revision 1.2
Representative and edge cases are checked before release.
Expected values below come from governing closed-form equations or explicit rejection conditions. The adjacent computed values are produced by the repository test suite.
| Tool | Check 1 | Expected 1 | Computed 1 | Check 2 | Expected 2 | Computed 2 |
|---|---|---|---|---|---|---|
| Tolerance stack | A−B stack | Nominal 6.0; WC 5.7–6.4 | Nominal 6.0; WC 5.7–6.4 | Empty stack | All outputs zero | All outputs zero |
| Bolt preload | 70 N·m torque | 35,000 N preload | 35,000 N preload | 25 kN target | 36 N·m torque | 36 N·m torque |
| Beam response | Cantilever end load | 187.5 MPa; 15.625 mm | 187.5 MPa; 15.625 mm | Simply supported center | 46.875 MPa; 0.9765625 mm | 46.875 MPa; 0.9765625 mm |
| Four-bar | Length classification | Grashof | Grashof | Open + crossed branches | Both close | Both close |
| Thermal fit | Differential CTE | 0.031024 mm final clearance | 0.031024 mm final clearance | No temperature change | Initial clearance unchanged | Initial clearance unchanged |
| Shaft torsion | 100 N·m mode | Classical stress + twist | Classical stress + twist | 5 kW at 1500 rpm | 31.831 N·m | 31.831 N·m |
| Compression spring | 2 mm wire reference | 4.8401 N/mm; 20 mm margin | 4.8401 N/mm; 20 mm margin | Invalid coil geometry | Rejected | Rejected |
| Pin + clevis | 10 kN double shear | 125 MPa lug bearing; FoS 2.0 | 125 MPa lug bearing; FoS 2.0 | Invalid plane count | Rejected | Rejected |
Changelog 1.2: visible verification register, release metadata, printable records, accessibility review, expanded edge-case coverage, and corrected capability links. New calculators remain deferred until this release discipline is complete.
Direct conversation
Use the calculation to define the next engineering check.
The result is a screening record, not a release decision. Bring the real geometry, interfaces, load cases, and acceptance criteria into the next review.
Discuss the Design