Recent Blogs
Bell-crank Lever with Slotted Disk Crank Mechanism: How It Works, Diagram, Parts and Uses
How a Bell-crank Lever with Slotted Disk Crank converts rotary motion into timed angular output for indexing, valve gear, and textile machinery applications.
Beam-driven Crank and Fly-wheel Mechanism: How It Works, Parts, Diagram, and Uses Explained
Beam-driven crank and flywheel converts oscillating beam motion into smooth rotation. See how it works, the math, and real engine applications.
Slider-crank Linkage Mechanism: How It Works, Diagram, Formula, Parts, and Real-World Uses
Slider-crank Linkage explained: how it converts rotation to linear motion, real engine and pump examples, sizing math, and tolerance rules from FIRGELLI engineers.
Crank (general) Mechanism: How It Works, Slider-Crank Diagram, Parts and Real-World Uses
Explore an in-line slider-crank. Calculate stroke, slider travel, rod-length ratio and mean piston speed, and inspect angles where a short rod cannot reach the guide.
Crank Substitute Mechanism: How the Planetary Gear Slider-Crank Works, Parts & Uses
Explore an internal-gear crank substitute. Compare the straight-line 2:1 case with changed tooth counts or pin offset, and calculate first-turn spans and peak pin speed.
White's Pulleys Mechanism Explained: How a Single-Rope Stepped-Sheave Tackle Works
Explore pulley effort and rope travel using an entered mechanical advantage and efficiency. The simplified support-force sum is not an anchorage rating.
Vibratory Belt Motion: Segment-Lever Illustration and Harmonic Calculator
Compare two strokes and calculate ideal sinusoidal peak belt speed and acceleration under an explicit one-cycle-per-revolution assumption.
Three-pulley Two-speed Drive: Ideal Speed and Torque Ratios
Compare two stepped-pulley speed ratios and reciprocal lossless torque ratios. The schematic idler redirects the belt; belt fit, tension and shifting are not calculated.
Differential Transmission: Signed Side-speed Comparison
Compare carrier speed for same-direction and opposed-direction inputs to an ideal equal-side-gear differential. Torque, power flow and shifting behavior are not calculated.
Two Fixed and One Movable Pulley: Three-part Tackle Calculator
Explore the shown 3:1 tackle and compare haul force using an assumed per-sheave tension ratio. Results do not rate a lifting system.
Sprocket and Chain Drive Mechanism Explained: How It Works, Parts, Diagram, Formula and Uses
How a Sprocket and Chain Drive transmits torque without slip — pitch, ratio, and chain tension explained for conveyor, motorcycle, and robotics builds.
Spanish Barton (form 2) Mechanism Explained: 5:1 Compound Pulley Parts, Formula & Rigging Uses
Spanish Barton form 2 rigging explained — how stagehands and riggers achieve 5:1 mechanical advantage with two single blocks to lift heavy loads safely.
Spanish Barton (form 1) Mechanism Explained: 5:1 Compound Pulley Diagram, Parts and Uses
How the Spanish Barton form 1 tackle works, its 5:1 mechanical advantage, rigging formula, and worked example for lifting heavy loads in arborist and rescue...
Simple Lifting Pulley Mechanism: How It Works, Diagram, Parts, Formula and Uses Explained
Explore a fixed pulley with a continuous rope animation. Calculate effort from load and selected efficiency, plus the sheave-to-rope diameter ratio.
Movable-Pulley Cord System (d): Fixed-Redirect 2:1 Ledger
How a cord-and-movable-pulley system halves lifting force. Real worked example, mechanical advantage formula, and rigging examples for shop and field use.
Movable-Pulley Cord System (c): Standing-End and Haul-Line Ledger
How a cord-and-movable-pulley system halves lifting force in rigging, theatre, and workshop hoists. Mechanical advantage formulas, worked example, and diagrams.
Movable-Pulley Cord System (b): 2:1 Lift with Right-Angle Haul
Movable pulley systems with cord cut lifting force in half or better. See how riggers, theatres, and shipyards use them to hoist heavy loads with...
Movable-Pulley Cord System (a): Fixed 2:1 Reeving Ledger
Movable pulley systems with cord cut lifting force in half or more. Learn the mechanical advantage formula, real rigging examples, and design tradeoffs.
Horizontal Shaft to Two Vertical Shafts: Ideal Belt-Speed Ledger
How a single horizontal shaft drives two vertical shafts via crossed pulleys and a flat band — used in line shafting, mill drives, and overhead...
Plain Flat-Belt Pulley: Declared Crown Geometry
Plain flat-belt pulley design explained — crown geometry, tracking, slip, and sizing for industrial conveyors, line shafts, and machine drives.
Notched V-Grooved Pulley for a Round Band: Brown Item 259
Explore Brown's notched V-grooved pulley for a round band. Calculate ideal band-centre height, flank span and clearance from diameter, angle and root relief.
Movable Pulley with Counterweight: Exact Balance and Travel Ratio
Explore an ideal counterweighted movable pulley. Calculate line tension, counterweight mass, two-to-one travel and load imbalance for two vertical supporting legs.
Single Movable Pulley: Ideal Rope Tension and Displacement Geometry
Calculate ideal rope tension, vertical force ratio and local load rise for a single movable pulley with symmetric rope segments. Includes an animated force model.
Modified Cone Pulleys: Exact Open-Belt Length
Compare four opposed stepped-pulley pairs and calculate exact ideal open-belt lengths and their spread at a shared shaft center distance.
Friction Pulley with Eccentric Arms: One-Way Drive Animation
See how eccentric arms grip a pulley rim in one direction and release in the other. Compare outer-belt tension ratios separately from the internal clutch.