Recent Blogs
Irregular Rocking Motion: Work and Return Allocation Calculator | FIRGELLI
Watch a crank pin drive a grooved rocking arm. Separately compare two entered angular allocations, their ratio and normalized shares.
Combination Crank-motion Curves: Crank-Rocker Linkage and Interactive Pen Trace
Explore the curve drawn by a pen on a crank-rocker’s rigid connecting arm. Change link lengths, pen offset, starting angle and cycle time.
Ornithopter Crank–Rocker Drive Geometry
Explore an ornithopter crank-rocker drive. Change four link lengths to compare the rocker-angle range and endpoint chord of an ideal planar linkage.
Link Transmission Mechanism: How Four-Bar Linkages Work, Parts, Transmission Angle and Uses
Explore transmission angle at a coupler-to-rocker joint. Calculate normalized tangential and radial force components and compare the angle with a chosen band.
Alternating Circular Motion Mechanism: How It Works, Crank-Rocker Diagram, Parts and Uses
Explore a crank-rocker converting full rotation into angular oscillation. Compare crank-length error using an explicit assumed sensitivity separate from the animated geometry.
Grashof Linkage: Four-Bar Assembly and Rotation Calculator | FIRGELLI
Check four link lengths for assembly and Grashof rotation. Compare sorted sums and margin, with a longest-ground four-bar animation and worked example.
Closed Four-Link Chain: Planar Mobility Calculator | FIRGELLI
Explore planar link and joint counts, the Gruebler–Kutzbach equation and a four-bar illustration. Understand connectivity and constraint assumptions.
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.
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.
Rocking Motion Mechanism Explained: Crank-Rocker Four-Bar Linkage, Parts, Formula & Uses
Rocking motion converts continuous rotation into a bounded back-and-forth swing. Learn the geometry, formula, and real applications across textile, packaging, and HVAC.
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.
Reciprocal Circular Motion Mechanism Explained: How It Works, Parts, Formula and Uses
Explore a four-bar crank-rocker with an interactive linkage diagram. Calculate ideal rocker swing, cycle rate and full-revolution closure from pin-centre distances.
Combination Disk-and-arm Reciprocator Mechanism: How It Works, Parts, Formula and Uses
Explore a rotating disk, rocker arm and guided slider. Change link dimensions to compare output stroke and rightward/leftward travel times at constant crank speed.