Tools

Engineering Calculators

The working calculators from the original site, ported to run in any modern browser. The computation is a literal port of the original JavaScript and is checked against the legacy output before a calculator is marked validated.

11 validatedMigration in progress — 11 live of ~162 distinct models catalogued. See the migration status.

Gas & aerostatic bearings

Aerostatic thrust bearing — simple orifice restrictorLoad capacity, stiffness, mass flow and orifice sizing for an aerostatic thrust bearing with a simple orifice restrictor. Unlocked from the legacy demo gate; general in its geometry.✓ validated · from c12_4b2.htm Aerostatic shallow-pocket thrust bearingLoad capacity, stiffness and flow for an aerostatic shallow-pocket thrust bearing, from the pocket and land pressure profiles. Unlocked from the legacy demo gate; general in its geometry.✓ validated · from c12_4f.htm Aerostatic bearing — grouped inherent orificesDesign pressure ratio and load capacity for an aerostatic thrust bearing fed through grouped inherent orifices.✓ validated · from c12_4c.htm

Spiral-groove bearings

Spiral-groove bearing (axial)Axial load capacity, stiffness, friction torque and power loss for a spiral-groove thrust bearing — a specialist calculation with essentially no free equivalent anywhere.✓ validated · from e9_3.htm Spiral-groove thrust bearing (design)Operating speed, friction torque and power loss for an axial spiral-groove thrust bearing carrying a given load, from the groove geometry and film thickness.✓ validated · from e9_4.htm Herringbone thrust bearing (design)Operating speed, friction torque and power loss for a herringbone-profile spiral-groove thrust bearing carrying a given load.✓ validated · from e9_5.htm

EHL & film thickness

EHL line contact — film thicknessCentral film thickness of an elastohydrodynamic line contact from the Moes dimensionless load/lubrication groups, with contact half-width and Hertzian pressures.✓ validated · from e12_4.htm

Wear

Specific wear rate (pin-on-disk)Specific wear rate from a pin-on-disk test, derived from the worn volume, normal load and sliding distance (Archard-type wear coefficient).✓ validated · from e4_1.htm

General engineering

Hertz point contactContact radius, elastic approach, mean and maximum contact pressure, and contact stiffness for two bodies in point contact (Hertz theory).✓ validated · from e2_1.htm Press fit (interference fit)Contact pressure, transmissible force and torque, and the tangential/radial/equivalent stresses in an interference fit, from Lamé’s equations in the elastic regime.✓ validated · from e3_8.htm Bolt preload torqueTightening torque to reach the preload of a metric bolt, with the induced torsional/equivalent stress and the bolt-force reserve — from ISO thread geometry and the strength class.✓ validated · from e3_6a.htm