Recent Blogs
Valve Gear: Ideal Gross Lift from Lobe Lift and Rocker Ratio
Explore a cam, pushrod, rocker and poppet-valve arrangement. Calculate ideal gross lift from lobe lift and a constant rocker ratio; timing and clearances are not...
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.
Cornish Engine Valve Gear: Plug Rod, Tappets and Travel Ratios
Explore an illustrative beam, plug rod, tappet and poppet-valve arrangement. Compare entered travel ratios and stroke interval; actual trip timing and steam cutoff are not...
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
Explore a crank pin and sliding bearing box in a slotted cross-head. Calculate selected-angle velocity, peak speed, stroke and transverse pin offset.
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 a Single Engine: Eccentric–Slider Geometry
Calculate the position and rod angle of an eccentric-driven slider with an offset guide. See how this geometric element differs from a complete reversing valve...
Eccentric-rod Disengaging Device Explained: How It Works, Parts, Diagram & Uses in Steam Valve Gear
Explore Brown 186 manual eccentric-rod release with a moving hand lever, an illustrative lifting cam and a calculator for gab lift and valve-pin clearance.
Crank-shaft Governor Mechanism: How It Works, Parts, Diagram & Steam Engine Speed Control Explained
Explore a spring-balanced crank-shaft governor with a compound eccentric. Compare steady equilibrium, stop positions, weight forces, spring tensions and eccentric throw.