Recent Blogs
Four-Motion Sewing Feed: Average Speed Calculator | FIRGELLI
See rise, advance, fall and return, and compare ideal average fabric feed from stitch length and three rates. Machine limits and timing are separate.
Four-Bolt Cam Plate: Radial Motion and Interactive Animation
See how a rotating cam plate moves four sliding bolts through curved slots. Compare radial travel and plate angle with an illustrative motion calculator.
Four-Speed Change Gear: Ratio, Speed and Torque Comparison | FIRGELLI
Compare four ideal speed positions from a base tooth ratio and fixed √2 steps. Output torque uses 95% assumed efficiency; physical gear design is separate.
Flexible Angular Coupling: Misalignment Comparison | FIRGELLI
Compare a measured shaft angle with the applicable manufacturer limit. Calculate angle ratio, signed margin, excess angle and radians without predicting fatigue life.
Ferris Wheel: Circumference and Rim-Speed Calculator | FIRGELLI
Calculate circumference, rpm, angular speed and rim speed from wheel diameter and revolution time. Watch pivoted cars remain upright in the idealized animation.
Lead-Screw Feed Motion: Travel Speed Calculator | FIRGELLI
Calculate carriage feed from screw rpm and lead. Compare travel per minute, travel per second, advance per turn and revolution time.
Equally Traversing Rollers: Slotted-Yoke Calculator | FIRGELLI
Explore two rollers driven equal distances in opposite directions by a slotted yoke. Calculate roller travel, separation change and a geometric clearance bound.
Equalizing Tension Spring and Lever Mechanism: How It Works, Parts, Formula, and Uses Explained
Explore an equalizing spring-and-lever arrangement and calculate spring force, torque and balanced line tension from effective moment arms.
Endless Rack Reciprocator Mechanism: How It Works, Parts, Formula and Uses Explained
Explore an endless rack with a vertically guided pinion. Calculate stroke, straight-run speed and full cycle time including the rounded-end reversals.
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...
Drag-link Quick-return Mechanism: How It Works, Diagram, Parts, Time Ratio and Uses Explained
Explore a drag-link quick-return drive with a guided ram. Calculate stroke, position, velocity and the time ratio between its two travel directions.
Double-screw Toggle Press Mechanism: How It Works, Diagram, Formula, and Uses Explained
Explore an opposed-thread screw driving two toggle linkages. Compare endpoint angles, platen travel, screw turns and ideal force from total handwheel torque.
Double-pawl Ratchet Wheel Mechanism: How It Works, Diagram, Parts, and Index Angle Calculator
Explore two curved pawls driving one ratchet wheel on alternate handle strokes. Calculate angular advance, mean wheel speed and cycle period.
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.
Double Helico-volute Spring Mechanism: How It Works, Parts, Formula and Uses Explained
Explore a double-tapered compression spring. Enter overall spring rate, free height and compression to estimate force, stored energy and loaded height.
Double Cam Motion: One Elliptical Cam and Perpendicular Follower Outputs
Explore one elliptical cam driving two perpendicular follower faces. Compare equal output strokes, phase shift and support distances for the stated geometry.
Disk-and-pin Lever Vibration Mechanism: How It Works, Parts, Diagram, and Calculator
Explore a rocking lever with its pin following a rotating disk groove. Compare sinusoidal swing, frequency, pin travel and groove clearance.
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.
Curious Padlock: Corkscrew Key, Spiral Keyway and Bolt Calculator
Explore Hiscox’s curious padlock with a corkscrew key, numbered entrance cylinder and sliding bolt. Calculate insertion distance, key turns and helical travel.
Continuous Motion Ratchet: Three-Bevel-Gear Drive and Feed Calculator
Explore a three-bevel-gear ratchet drive that advances on both handle strokes. Compare ideal screw-feed rates from tooth count, pitch and complete cycle rates.
Conical Drum Variable Rotary Roller Mechanism Explained: How It Works, Diagram, Parts and Uses
Compare two friction-roller contact positions on a conical drum. Calculate relative speed ratios and check whether each contact lies within the drum ends.
Compound Disc Spring Mechanism Explained: Stacking, Parts, Formula, and Uses
Compare ideal force, travel and local stiffness multipliers for disc springs stacked in series and parallel. Animate every washer and see the limits of count-only...
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.