Recent Blogs
Trotbot Leg Linkage Mechanism Explained: How the Eight-Bar Walking Linkage Works
Trotbot leg linkage explained — geometry, foot path, formulas, and a worked walking-robot example. Build notes from FIRGELLI's chief engineer.
Ghassaei Walking Linkage Mechanism: How It Works, Parts, Geometry, and Walking Gait Explained
How the Ghassaei walking linkage works — a single-DOF leg mechanism for kinetic sculpture, robotics demos, and educational walkers. Diagram, formula, examples.
Sarrus Linkage Mechanism: How It Works, Parts, Formula, Diagram and Uses Explained
Sarrus Linkage explained — the spatial straight-line mechanism behind deployable solar arrays, scissor lifts, and folding optics. With formula and worked example.
Swinging-block Linkage Mechanism Explained: How It Works, Diagram, Parts, Formula and Uses
Swinging-block linkage explained — how this slider-crank inversion drives quick-return motion in shapers, planers, and packaging machines, with formulas and a worked example.
Spring-return Treadle to Pulley Mechanism: How It Works, Parts, Diagram, and Uses Explained
Spring-return treadle to pulley converts foot strokes into shaft rotation via a crank and return spring. Sizing, formulas, and real workshop examples.
Slotted Main Crank with Elliptical Pin Orbit Mechanism: How It Works, Parts, Diagram and Uses
Slotted main crank with elliptical pin orbit explained — geometry, motion equations, and a worked example for textile loom batten drives at 220 RPM.
Modified Slotted Crank with Link Mechanism: How It Works, Diagram, Parts, Formula and Uses
Modified Slotted Crank with Link explained — how the slotted lever and connecting link convert rotation into asymmetric reciprocation in packaging and printing machines.
Bell-crank with Connecting Rod Mechanism: How It Works, Parts, Uses & Calculator
Bell-crank with connecting rod explained — how the right-angle linkage redirects motion, sizing math, and worked examples from aerospace flight controls.
Ross Yoke Mechanism Explained: How It Works, Diagram, Parts, Formula and Stirling Engine Uses
Ross yoke mechanism explained — how this slotted-yoke linkage replaces the connecting rod in opposed-piston engines, with formulas, tradeoffs, and a worked Stirling example.
Oscillating Column (form 1) Mechanism: How It Works, Diagram, Formula & Uses
How the Oscillating Column (form 1) converts continuous rotation into limited swinging motion — with formulas, tolerances, and real machine examples.
Gyrating Lever Transmission Mechanism: How It Works, Diagram, Parts, Formula and Uses Explained
Gyrating Lever Transmission explained — how the orbiting lever transmits power, where it appears in agricultural and pumping machinery, with formulas and a worked example.
Gambrel Joint Linkage Mechanism: How It Works, Parts, Formula and Real-World Uses Explained
Gambrel joint linkage explained — how the folding two-bar knee joint transmits power in barn doors, prosthetic knees, and folding aircraft wings. Specs included.
Stephenson Topology Six-bar Linkage: How It Works, Diagram, Parts, Uses & Calculator
Stephenson topology six-bar linkage explained — how it works, kinematic equations, and real applications in packaging, automotive seats, and industrial machines.
Rhombic Drive Mechanism: How Philips' Counter-Rotating Stirling Linkage Works, Diagram & Uses
Rhombic Drive explained — how Philips' Stirling engine linkage cancels vibration, balances pistons, and powers cryocoolers in aerospace and lab applications.
Jansen's Linkage Mechanism: How It Works, Diagram, Holy Numbers, Parts and Uses Explained
Jansen's Linkage explained — how the 12-bar Theo Jansen leg works, foot-path geometry, design formulas, and worked examples for walking robot builders.
Hart's Exact Straight-line Inversor: How This Six-Bar Mechanism Traces an Exact Straight Line
Hart's Inversor draws a true straight line from rotary input using a 6-bar antiparallelogram linkage. Used in precision metrology and optical alignment rigs.
Four-bar Linkage Mechanism: How It Works, Diagram, Grashof Condition, Parts and Uses Explained
Four-bar linkage explained — how the crank-rocker geometry works, Grashof's rule, coupler curves, and real applications in automotive suspension and robotics.
Evans Grasshopper Linkage Mechanism Explained: How It Works, Parts, Formula and Uses
Evans Grasshopper Linkage explained — how this approximate straight-line mechanism guides a piston rod cleanly without crosshead rails in steam and lab gear.
Drag-link Mechanism Explained: How It Works, Parts, Diagram, Quick-Return Uses & Formula
Drag-link mechanism explained — how the double-crank four-bar converts steady rotation into variable-speed rotation for industrial shaping and indexing machines.
Chebyshev Linkage Mechanism: How It Works, Parts, Formula, and Uses in Walking Robots
The Chebyshev Linkage converts rotary motion into near-straight-line travel without slides. See how it works, the formula, and real applications in robotics.
Cardan Straight-line Mechanism: How It Works, Diagram, Formula, and Uses Explained
Cardan straight-line mechanism explained — how the gear-in-gear hypocycloid produces exact linear motion, with worked example and applications in precision machinery.
Slotted Vibrating Bar to Horizontal Bar Mechanism: How It Works, Diagram, Parts, and Uses
How the Slotted Vibrating Bar to Horizontal Bar mechanism converts oscillation to linear travel. Formula, worked example, and real applications in automation.
Six Radial Grooved Trammel Mechanism Explained: How It Works, Parts, Formula and Uses
Six Radial Grooved Trammel explained — how the slotted disc converts rotation into reciprocating motion, design rules, and examples from textile and packaging machines.
Rocking Arm Mechanism Explained: How a Crank-Rocker Four-Bar Linkage Converts Rotation to Oscillation
Rocking Arm mechanism explained — how it converts rotation to oscillation, sizing formulas, real machine examples in textiles, printing, and packaging.
Pair of Toe Levers Mechanism Explained: How It Works, Diagram, Parts, Formula and Uses
Pair of toe levers explained — how this dual-pedal motion control mechanism works, sizing formula, worked example, and real industrial applications.