Recent Blogs
Valve Gear Mechanism Explained: How It Works, Parts, Valve Lift Formula and Uses
Valve Gear explained — how cam timing, lift, and duration control intake and exhaust events in gas and gasoline engines, with worked examples and design...
Rotary Engine (form 2) Explained: How the Eccentric Vane Steam Mechanism Works, Parts and Uses
How a Form 2 rotary steam engine works — eccentric drum, sliding abutment, multi-vane sealing. Real numbers, worked example, and heritage steam applications.
Diagonal Catch Hand-gear (top of Cylinder): Mechanism, Parts & Calculator Explained
Diagonal catch hand-gear explained — how the top-of-cylinder lever engages a steam locomotive's valve gear, with a worked example from a heritage railway rebuild.
Valve Gear of a Cornish Engine: How the Trip Mechanism, Plug Rod and Tappets Work
Understand Cornish engine valve gear — how the steam, equilibrium and exhaust valves are tripped by tappets and plug rod to drive single-acting pumping engines.
Valve Gear (form) Mechanism Explained: How It Works, Parts, Diagram, and Cut-Off Calculator
Valve gear controls steam admission and exhaust timing in reciprocating engines. Learn cut-off, lead, lap, and how Stephenson and Walschaerts gears work in service.
Steam Engine Valve Chest Mechanism Explained: D-Valve Parts, Lap, Lead and Port Opening Diagram
Steam engine valve chest explained — how the slide valve admits and exhausts steam, port sizing, lap and lead, and worked examples from heritage marine...
Steam Engine Guides (form 4): How Four-Bar Crosshead Guides Work, Parts & Slipper Pressure
Steam engine guides (form 4) keep the crosshead aligned and absorb piston-rod side thrust. Learn the geometry, loading limits, and heritage engineering use.
Steam Engine Guides (form 2): How Form-2 Bar Guides Work, Parts, Side Thrust & PV Loading
Steam engine crosshead guides keep the piston rod dead straight under thrust. Learn slipper geometry, rubbing speeds and clearance limits for heritage engines.
Steam Engine Guides (form 1): Crosshead Mechanism, Slipper Diagram, Side-Thrust Formula Explained
Steam engine guides keep the crosshead aligned with the cylinder bore. Learn how slipper, bar and 4-bar guides work, with sizing math and worked examples.
Steam Engine (form) Explained: Mechanism, Cylinder Layouts, Slider-Crank Diagram & Parts
Steam engine form explained — cylinder, piston, valve gear and crank arrangements that define every layout from Watt beam engines to Stuart Turner mill engines.
Slotted Cross-head Mechanism: How It Works, Parts, Formula, and Uses in Steam Engines
Slotted cross-head explained — how this Scotch-yoke-style mechanism converts piston motion into shaft rotation in steam pumps, donkey engines, and small mill drives.
Rotary Engine (form 4) Mechanism: How It Works, Parts, Diagram, Animation and Indicated Power
Rotary Engine form 4 explained — eccentric piston geometry, steam admission, indicated power formula, and a worked heritage marine example with real numbers.
Root's Double-quadrant Engine Mechanism Explained: Diagram, Parts, Formula & Uses
Root's double-quadrant engine explained: how the curved-arm linkage converts piston travel to crank rotation, with sizing math and a heritage millwork example.
Reversing Gear for Single Engine: Mechanism, Stephenson Link Motion, Cut-off Calculator
Reversing gear for a single steam engine — how Stephenson, Walschaerts and slip-eccentric link gears reverse rotation, set cut-off and serve locomotives and launches.
Multiple Port Piston Throttle Valve Mechanism: How It Works, Parts, Diagram, and Locomotive Uses
Multiple Port Piston Throttle Valve explained — how the stacked ports give graduated steam admission, sizing math, worked example, and steam plant uses.
Joy's Hydraulic Shifting Eccentric Mechanism: How It Works, Parts, Diagram and Marine Uses
Joy's hydraulic shifting eccentric explained — how marine triple-expansion engines reverse without a separate eccentric, with worked example and design tradeoffs.
Eccentric-rod Disengaging Device Explained: How It Works, Parts, Diagram & Uses in Steam Valve Gear
How an eccentric-rod disengaging device works on steam engine valve gear, with formulas, a worked starting-gear example, and trade-offs vs link motion.
Disengaging Device (modification 3) Mechanism Explained: Parts, Diagram, and How It Works
Disengaging Device modification 3 explained — how the trip releases drive on steam engines, valve gears, and hoists. Formulas, worked example, and design tradeoffs.
Crank-shaft Governor Mechanism: How It Works, Parts, Diagram & Steam Engine Speed Control Explained
Crank-shaft governor explained — how it regulates steam engine speed, the inertia weights, eccentric shift, and worked example for a mill engine application.