Recent Blogs
Rope Grip Hook Mechanism Explained: How It Works, Parts, Wedge Friction Formula and Diagram
Rope grip hooks lock onto a rope under load and release when slack. Learn the physics, sizing formulas, and rigging examples used in arborist and...
Lifting Jack: Rotating-Screw Animation and Work-Ratio Calculator
See how a rotating screw moves through a fixed nut. Compare handle path, screw lead and entered efficiency to calculate an idealized axial-force ratio.
Lever Windlass Mechanism Explained: How It Works, Diagram, Parts, Formula and Uses
Compare the ideal lever-to-drum radius ratio and reciprocal hand-to-rope travel. The animation shows rope take-up and the holding pawl during handle reset.
Lever Sector: Circular Sweep Animation and Arc-Length Calculator
Calculate circular sector arc length, endpoint chord and travel per degree from radius and sweep angle. See the fixed-radius motion in an interactive animation.
Lever Safety Trip: Hiscox Forms 48a and 48b Viewer
Compare two historical lanyard-operated throttle-valve trips. View their armed and pulled lever positions and follow the valve-release connections.
Lever Paradox: Hiscox Item 10 Balanced-Linkage Viewer
Explore the lever paradox with a connected double-beam diagram. Compare three illustrated postures and equal-weight relationships without a structural capacity claim.
Lever and Ratchet: Ideal Force Ratio and One-Tooth Indexing
An ideal lever-force comparison with an animated ratchet cycle that separates drive, holding and reset phases without implying a product capacity.
Inclined Plane: Sliding Force and Work Calculator | FIRGELLI
Calculate constant-speed uphill force and work from mass, rise, slope length and an assumed sliding-friction coefficient. Includes the ideal force-distance relationship.
Rope End Mechanism Explained: How Whipping, Splices and Heat-Seal Terminations Work
Rope End explained — how to terminate, splice, and seize hemp and synthetic rope ends for rigging, sailing, and arborist work without losing rated load.
Wire Rope Clip and Thimble: Parts and Rating Limits | FIRGELLI
Explore a wire-rope eye schematic and understand the separate roles of clips and thimble. Illustrative dimensions do not determine assembly strength or working load.
Compound Weight Motor Mechanism: How It Works, Diagram, Parts, Formula and Uses Explained
Explore three falling weights on a continuous rope. Calculate ideal rope tension, drum torque and the torque change through two optional gear stages.
Chinese Shaft Derrick Mechanism Explained: How It Works, Parts, Diagram and Mechanical Advantage
Explore a differential windlass with overhead guide sheaves. Calculate ideal force multiplication, input torque and bucket rise from the two drum radii and handle effort.
Chinese Windlass Mechanism Explained: How It Works, Diagram, Formula, Parts and Uses
Compare two drum diameters on one shaft. Calculate ideal hand force, shaft torque and rise per turn, and see why closer diameters give slower lift...
Block and Tackle Mechanism: How It Works, Parts, Formula, and Mechanical Advantage Explained
How a Block and Tackle multiplies lifting force using rope and pulleys. Mechanical advantage formulas, rigging examples, and real sailing and crane applications.
Wedge Cam Mechanism: How It Works, Diagram, Formula, and Industrial Uses Explained
Explore ideal wedge-cam geometry. Compare follower lift, ramp length and frictionless force ratio from horizontal travel and ramp angle.
Waved-wheel Cam: Ideal Follower Event-rate Calculator
Compare two cam speeds and wave counts using one event per wave. The illustration shows cam-follower contact; the outputs calculate event rate and frequency.
Three-wiper Frame Reciprocator: Shaft Geometry
Explore Brown movement 128, with three wipers on one shaft driving one frame. Compare displayed wiper directions and tip-circle diameter; exact frame stroke is not...
Spiral Guide on Disk (drilling Feed) Mechanism: How the Archimedean Face Cam Drives Quill Feed
Spiral guide on disk converts rotation into linear drilling feed. Learn how the Archimedean groove drives drill-press quills with a worked example and selection rules.
Self-reversing Motion Contrivance: How It Works, Diagram, Parts, and Traverse Speed Formula
How a self-reversing motion contrivance converts continuous rotation into reciprocating linear traverse — used on level-wind reels, winders, and lathes.
Reciprocating Pump From Rotary via Cam: How It Works, Parts, Diagram and Calculator
Explore a circular eccentric cam driving a pump plunger. Calculate plunger area, ideal volume per stroke and revolution, and revolutions per millilitre.
Oblique-Disk Reciprocator: Brown Item 95
Explore the oblique disk and upright resting follower in Brown item 95. Calculate ideal sinusoidal displacement and full stroke from contact radius and disk tilt.
Triangular Eccentric: Equal-Arc Geometry
Explore an equal-arc triangular eccentric and calculate ideal centroid support limits, lift and threefold repetition rate for a Reuleaux profile.
Modified Eccentric with Elongated Yoke: Straight-Line Motion
Explore how an eccentric disc and elongated yoke produce guided sinusoidal rod motion. Calculate stroke, ideal slot height, peak speed and acceleration.
Inverse Cam: Illustration and Circular Arc-to-Angle Calculator | FIRGELLI
View an illustrative profiled follower and convert circular arc length to central angle. The calculator does not predict cam-profile tolerance or output error.
Grooved Heart-Cam: Average Traverse Calculator | FIRGELLI
Compare average traverse speed, cycle time, nominal groove width and a selected stroke fraction. Includes an ideal heart-cam animation and explicit reversal limits.