A growing suite of offline, parametric design tools for mechanical engineers.
Spur & helical gear geometry with ISO 6336 bending and pitting strength.
Open ToolFull gear design suite: geometry, ISO 6336 strength, helical, 3D β at engtool.net/gear.
Open ToolCompression, extension and torsion spring sizing with rate and stress.
Open ToolWorm-and-wheel drive: efficiency, self-locking, contact & bending stress, heat balance.
Open ToolJournal bearing: Sommerfeld number, eccentricity, friction, heat balance.
Open ToolLead & ball screw: torque, efficiency, self-locking, buckling, von Mises.
Open ToolCylindrical interference fit: pressure, hub/shaft stress, torque & axial capacity.
Open ToolShaft first whirling speed: Rayleigh + analytical baseline, operating margin.
Open ToolKt catalog: hole, shoulder fillet, groove, keyway; nominal β peak stress.
Open ToolHolzer freeβfree torsional system: natural frequencies, mode shapes, resonance vs operating speed.
Open ToolStraight / spiral bevel gear bending stress (AGMA-style) and safety factor.
Open ToolEpicyclic (planetary) train: speed ratio for ring/sun/carrier-fixed, member torques.
Open ToolSingle universal (Cardan) joint: speed ratio fluctuation, output torque, bearing load.
Open ToolSingle isotropic support rotor: unbalance response, vibration amplitude, ISO 1940 grade.
Open ToolPoint / line contact: reduced modulus, contact half-width, max pressure, approach.
Open ToolClosed gear drive: power losses, sump temperature, EHL film ratio Ξ».
Open ToolMarin endurance modification + mean-stress FoS (Goodman/Gerber/Soderberg/ASME) + life.
Open ToolRoller-chain (ISO 606) drive: sprocket geometry, chain speed, static safety factor, chain length & wrap angle.
Open Tool2/3/4-stage spur & helical gear trains: ratio split, tooth selection, cascade and per-stage ISO 6336 strength.
Open ToolISO 3601 radial O-ring groove sizing, squeeze, pressure rating and friction.
Open ToolShear capacity and efficiency of bonded lap joints (teaching model).
Open ToolGrashof classification and slider-crank kinematics (teaching model).
Open ToolRatchet wheel tooth bending / shear strength and pawl self-locking (teaching model).
Open ToolTorque capacity of shrink discs and locking assemblies (teaching model).
Open ToolSizing of multi-stage reduction gearboxes: speed, torque, efficiency (teaching model).
Open ToolNatural frequency, transmissibility and isolation efficiency (teaching model).
Open ToolMatch an electric motor to a load via a gearbox (teaching model).
Open ToolStrain-wave gear ratio, torque capacity and speed limit (teaching model).
Open ToolSliding annular thrust bearing with viscosityβtemperature thermal loop (teaching model).
Open ToolShear and bearing capacity of pinned lap joints (teaching model).
Open ToolStiffness, deflection, stress and twist for flat/leaf springs and torsion bars (teaching model).
Open ToolSynchronous (timing) and V-ribbed (poly-V) belt capacity, pitch-line speed and safety factor (teaching model).
Open ToolTooth contact (pitting) and bending safety of an external gear pair (teaching model).
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