Understand the machine by understanding the engineering underneath it.
Every excavator, crane, and haul truck here is an example, not the subject. The subject is torque, hydraulics, gears, and combustion — the same handful of principles, reused at every scale from a telehandler's boom to the largest crane ever built.
JUST FOR FUN
What Kind of Heavy Machine Are You?
A ten-question personality quiz, matched against real specifications from the 20 machines on this site. Take the quiz →
Machines, by Category
Real, named equipment — not generic types — each one cross-linked to the engineering principles that make it work.
Construction Equipment
Mining Equipment
Underground Equipment
Agricultural Machinery
Forestry Machinery
Industrial & Material Handling
Military Engineering Vehicles
Special Purpose Machines
Engineering Fundamentals
The physics and mathematics underneath every machine on this site, with the real machines that apply each one listed automatically on its page.
Interactive Diagrams
Every engineering concept here includes a live, code-generated diagram — sliders and toggles, not static illustrations.
Lever & TorqueTorqueLever Mechanical AdvantageMechanical AdvantageGear Pair SimulatorGear RatiosPlanetary Gearbox SimulatorPlanetary GearsHydraulic Force MultiplierPascal's LawHydraulic Cylinder StrokeHydraulic CylindersFour-Stroke Cycle AnimationFour-Stroke Diesel CycleTorque Converter CurveTorque ConvertersFinal Drive & DifferentialFinal Drives & DifferentialsBearing CutawayBearings