Recent Blogs
Locking Pliers Mechanism: How the Over-Centre Toggle Lock Works, Parts, Uses & Clamp Force Formula
Locking pliers clamp with 1,000+ lbs of jaw force using an over-centre toggle. Learn the geometry, sizing math, and shop applications used by mechanics and...
Chain and Pulley (form 3) Mechanism: How Pocketed Sheave Hoists Work, Parts, Diagram and Uses
Chain and Pulley form 3 drive explained — how the hybrid chain-over-sheave system handles slip-free torque transfer in conveyors, hoists, and stage rigging.
Shears with Winch or Tackle Block: How It Works, Diagram, Formula & Rigging Uses Explained
How a shears lifting rig works — the geometry, the tackle block math, and how riggers use it to set heavy loads on bridges, masts,...
Tongue-and-groove Pliers Mechanism Explained: Jaw Geometry, Lever Ratio, and Clamping Force
Tongue-and-groove pliers explained — how the slip-joint channel works, jaw geometry, grip force calculations, and real plumbing and HVAC use cases.
Slip-joint Pliers Mechanism Explained: How the Slot-and-Pin Pivot, Lever Ratio, and Jaw Geometry Work
How Slip-joint Pliers work, the pivot geometry behind the two jaw positions, and how plumbers, electricians, and mechanics use them on real jobs.
Cramp Drill (form 1) Mechanism Explained: How the Screw-Feed Hand Drill Works, Parts & Uses
Cramp Drill (Form 1) explained — how the screw-feed hand drill works, where it's still used in shipwright and joinery work, plus a worked feed-rate...
Bolt Cutters Mechanism Explained: Compound Leverage, Diagram, Animation, Calculator and FAQ
Bolt Cutters use compound leverage to multiply hand force up to 20× — cutting hardened steel padlocks, rebar, chain, and bolts cleanly in one squeeze.
Tread Mill Mechanism Explained: How Treadwheels Convert Walking Into Torque, Parts, Uses & Formula
How a treadmill wheel converts human or animal weight into rotary power. Sizing formulas, historical examples, and a worked dairy-mill calculation.
Screw Pair Mechanism: How It Works, Diagram, Lead Formula, Parts, and Uses Explained
Screw Pair explained — how helical threads convert rotation into linear motion, with lead/pitch math, real applications in machining, and design tradeoffs.
Differential Screw (compound Pitch) Mechanism: How It Works, Diagram, Formula & Uses Explained
Differential Screw explained: how compound-pitch threads deliver sub-micron motion in optics, machine tool calibration, and precision adjusters.
De-sta-co Toggle Clamp Mechanism: How the Over-Centre Linkage Works, Parts and Uses Explained
Learn how a De-Sta-Co toggle clamp works, the over-centre geometry behind its holding force, and how to size one for welding, woodworking, and CNC fixtures.
The Wedge Mechanism Explained: How It Works, Formula, Diagram, and Real-World Uses
How the wedge works as a classical mechanical power, with formulas, real-world examples from log splitting to machining, and design tradeoffs from FIRGELLI engineers.
The Resolution of Suspension Explained: Mechanism, Force Triangle Diagram, Formula and Calculator
Resolution of suspension splits a hanging load between two ropes at known angles. Calculate cable tensions for rigging, theatre flies, and crane work.
Spanish Windlass Mechanism: How It Works, Diagram, Formula, and Rigging Uses Explained
How a Spanish Windlass works — the rope-and-stick tensioning mechanism used by riggers, arborists, and sailors to generate huge force from almost nothing.
Rope Twist Lever (Spanish Windlass) Mechanism: How It Works, Diagram, Formula, and Uses
Rope twist lever explained — how Spanish windlass tensioning works, the force formula, and real worked examples for rigging, arborist, and shelter applications.
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 Mechanism Explained: How Screw and Hydraulic Jacks Work, Parts, Formula and Uses
How a Lifting Jack works — screw, hydraulic, and ratchet types explained with formulas, real worked examples from automotive, rail, and stage rigging.
Lever Windlass Mechanism Explained: How It Works, Diagram, Parts, Formula and Uses
Learn how a lever windlass multiplies force to lift heavy loads. Engineering breakdown, formulas, and real applications in marine, mining, and rigging trades.
Lever Sector Mechanism: How It Works, Diagram, Formula and Uses in Valves and Steering
Lever sector explained — how a curved sector lever multiplies force or motion in valves, presses and steering gear, with formulas, examples and design rules.
Lever Paradox Explained: Mechanism, Diagram, Formula, and Real-World Uses
Lever Paradox explained — why a longer lever doesn't always win. Real numbers, worked examples, and applications from rigging, machining, and aerospace tooling.
Lever and Ratchet Mechanism: How It Works, Parts, Diagram, and Real-World Uses Explained
Lever and ratchet mechanism explained — how it amplifies force, holds load between strokes, and powers winches, jacks, and tensioners in the field.
Inclined Plane Mechanism Explained: How It Works, Diagram, Formula, Parts, and Real-World Uses
The Inclined Plane trades distance for force to lift heavy loads with less effort. See the formula, worked example, and real industrial applications.
Compound Weight Motor Mechanism: How It Works, Diagram, Parts, Formula and Uses Explained
How a Compound Weight Motor works, with a worked example, formulas, and named applications in clocks, foundry hoists, and gravity-powered demonstrators.
Chinese Shaft Derrick Mechanism Explained: How It Works, Parts, Diagram and Mechanical Advantage
Chinese Shaft Derrick explained — how this mineshaft hoist multiplies human and animal effort to lift ore, water, and tools from deep vertical workings.
Chinese Windlass Mechanism Explained: How It Works, Diagram, Formula, Parts and Uses
The Chinese Windlass uses two drum diameters on one shaft to multiply lifting force. See how riggers, theatres, and well-builders use it — with worked...