Recent Blogs
Crank-rocker Mechanism: How It Works, Diagram, Parts, Formula, and Industrial Uses Explained
Explore four-bar linkage geometry. Check full input rotation, output angular range, Grashof margin and minimum transmission angle from four entered link lengths.
Cognate Linkage Mechanism: How It Works, Roberts-Chebyshev Theorem, Diagram and Uses Explained
Compare three Roberts–Chebyshev four-bar cognates tracing one point path. Scale the coupler triangle and inspect matching configurations and different fixed pivots.
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.
Bell-crank Lever (changing Direction of Force): Mechanism, Diagram, Animation & Calculator Explained
Bell-crank lever explained: how this 90° force-redirecting linkage works, with formulas, worked examples, and real uses in aircraft controls and machinery.
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.
Internal Multiple Cam: Dimension and Phase-Time Comparisons | FIRGELLI
Explore a cam ring adjusting six radial slides. Separately compare diameter plus clearance and shaft phase time; these sums do not size the illustrated cam.
Intermittent Reciprocating Motion: Dwell Time Calculator | FIRGELLI
Convert a total dwell angle and constant input rpm into cycle, dwell and non-dwell time. Rack travel and gear engagement are illustrative.
Intermittent Rotary Motion: Geneva and Carousel Pitch Calculator | FIRGELLI
Compare external-Geneva output step, driver engagement and dwell with carousel station pitch. The calculator identifies a direct pitch match, not a complete mechanism design.
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.
Double Link Universal Joint Mechanism: How It Works, Diagram, Parts, Formula and Uses
Explore two linked universal joints. Adjust bend angles and intermediate-yoke phasing to compare individual and coupled output-speed variation.
Disk-and-pin Alternate Rectilinear Mechanism: How It Works, Parts, Diagram, and Uses Explained
Explore a disk-and-pin slotted yoke that converts rotation into straight reciprocation. Set stroke and disk angle to calculate pin offset and yoke position.
Curvilinear Motion: Elliptical Path, Normal Acceleration and Force Calculator
Explore constant-speed motion around an ellipse. Adjust path dimensions, speed and mass to see local curvature, normal acceleration, net force and circuit time.
Brownell Crank Motion: Tangent-slide Geometry and Treadle Calculator
Explore Brownell’s spring-biased tangent-slide crank. Compare wrist radius, phase and treadle motion with a selected slide offset held during each revolution.
Rectilinear Vibrating Motion Mechanism: How It Works, Scotch Yoke Diagram, Formula and Uses
Explore Scotch-yoke motion and calculate stroke, amplitude, cycle frequency and peak slider speed from crank eccentricity and shaft RPM.
Diaphragm Pump Mechanism: Crank Drive, Valves and Flow Calculator
Explore a crank-driven diaphragm pump with animated check valves, exact linkage motion and shape-based ideal displacement and flow calculations.
Elliptical Gear and Slotted Bar: Ideal Phase and Projection
Explore equal elliptical pitch curves with an illustrative slotted bar. Calculate ideal speed ratio and a separate cosine projection; actual bar motion and loads are...
Slow Forward and Quick Back Circular Motion: How the Elliptical Gear Quick-Return Mechanism Works
Slow forward and quick back circular motion explained — how elliptical gear pairs deliver a working stroke and rapid return in shapers, presses and packaging...
Sector Pinion and Double Rack Mechanism: How It Works, Parts, Formula, and Uses Explained
Sector Pinion and Double Rack converts oscillating rotary input into reciprocating linear motion. Learn the geometry, sizing math, and real machine-tool uses.
Rectangular and Noncircular Gears: Contact Radii and Instantaneous Speed
Explore the local speed relation behind noncircular gears. Calculate pitch-point radii and opposing output speed; complete rectangular gear profiles are not generated.
Pin Wheel and Slotted Pinion: Three Selectable Speed Changes
How a pin-wheel and slotted pinion converts continuous rotation into stepped indexing motion — design rules, formulas, and real-world examples from packaging and watchmaking.
Irregular Vibratory Motion: Normalized Speed-Profile Calculator | FIRGELLI
Compare modulation depths implied by two peak-to-minimum speed ratios for a stated sinusoidal law. The plot does not calculate gears, machine vibration or screening performance.
Friction Gearing: Driver Torque and Utilization | FIRGELLI
Compare a driver-shaft friction torque limit with demand using normal force, coefficient and driver radius. Keep driver and follower torque distinct.
Elliptical Spur Gears: Animation and Variable-Speed Calculator
Explore matching focal elliptical gears and calculate live pitch radii, speed ratio and output rpm through one variable-speed revolution.