Recent Blogs
TrotBot Leg Linkage: Walking Animation and Clearance Comparison
Watch a fixed-geometry TrotBot leg and its foot and toe paths. Compare entered joint-clearance sums separately; these values do not predict foot-position error.
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: Ideal Angle-ratio Calculator
Compare ideal larger and smaller crank-angle intervals and their constant-speed time ratio from entered crank radius and center offset.
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.
Crank-and-Slotted-Lever Quick Return: Geometry and Timing
Explore a crank-and-slotted-lever quick-return mechanism and calculate working and return sweeps, time ratio and durations from its fixed-center geometry.
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.
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
Explore a symmetric rhombic drive with counter-rotating cranks and four equal links. Calculate rhombus height limits and shaft angular speed.
Four-Bar Linkage: Grashof Margin and Geometry Explorer | FIRGELLI
Explore four-bar lengths, Grashof margin and sampled angles. Learn the limits of branch selection, angle spans and the illustrative index.
Evans Grasshopper Linkage: Coupler-Path Calculator | FIRGELLI
Explore an Evans four-bar linkage with an approximately straight coupler path. Compare link scale, crank sweep, traced stroke and lateral wander.
Drag-link Mechanism Explained: How It Works, Parts, Diagram, Quick-Return Uses & Formula
Explore a drag-link four-bar with adjustable link lengths and input speed. Calculate Grashof margin, variable output rpm and two output half-turn times.
Chebyshev Linkage: Double-Rocker Motion and Coupler-Midpoint Path
Explore a Chebyshev double-rocker linkage. Adjust four link lengths and compare sampled horizontal span and vertical variation of the coupler midpoint.
Cardan Straight-line Mechanism: How It Works, Diagram, Formula, and Uses Explained
Explore the Cardan straight-line mechanism: a half-size pinion inside a fixed ring. Compare pitch diameters, stroke and tooth counts in the ideal 2:1 geometry.
Slotted Vibrating Bar to Horizontal Bar Mechanism: How It Works, Diagram, Parts, and Uses
See how a pivoted slotted lever drives a horizontal slider. Calculate ideal stroke, mean round-trip speed and one-sided travel.
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.
Elliptical Crank: Trammel Animation and Point-Velocity Calculator
Explore a double-slider elliptical trammel. Adjust horizontal and vertical semi-axes, initial phase and cycle time while following position and speed.
Egg-shaped Elliptical Movement Mechanism: How It Works, Diagram, Formula, and Uses Explained
Trace a fixed point on an aligned slider-crank connecting rod. Adjust crank radius, rod length and point position to compare path shape, travel and mean...
Synchronization Gear: Historical Overview and Phase Concept
Read about historical aircraft synchronization gear and an abstract phase illustration. This page provides no construction, calibration or operating guidance.
Anti-twister Mechanism Explained: How It Works, Diagram, Parts, Formula, and Uses
Explore the Adams anti-twister’s half-speed carrier and calculate angular mismatch from ratio error. Follow the moving cable path without treating it as a strain model.