Recent Blogs
Vise Grip Pliers: Toggle Animation and Ideal Force Calculator
Explore an over-center toggle and calculate ideal jaw force from an entered hand-force ratio. Compare units and a signed angular force component.
Two-finger Parallel Gripper: Catalog Reference-force Comparison
Compare pressure scaling from a stated SMC MHZ2-16D per-finger reference and an ideal friction bound. Use official gripping-point curves for selection.
Toggle Latch: Over-center Arrangement and Elastic Comparison
Explore an over-center draw latch and compare an assumed elastic extension with a constant rate. The calculation does not establish latch force or locking reliability.
Three-jaw Scroll Chuck: Ideal Torque and Radial-load Model
Explore a self-centering scroll chuck and compare ideal radial load with effective scroll torque and lead. Results do not establish grip ratings or key-tightening torque.
Slam Latch: Mechanism, How It Works, Diagrams, Videos, Detailed Explanation
Slam latches let you close a panel with one push — no key, no twist. Learn how the spring-loaded bolt, strike, and release work in...
Sash Lock Mechanism Explained: How Cam-Action Window Latches Work, Parts & Diagram
Sash lock mechanics, sizing, and selection for window security. Real specs, formula, and worked example for hardware specifiers and restoration carpenters.
Quick-Release Skewer: Ideal Eccentric-Cam Geometry
How a quick-release skewer clamps a bicycle wheel — cam mechanics, clamping force, real torque numbers, and failure modes from a working engineer.
Mortise Lock: Mechanism and Case Fit Calculator
Explore mortise-lock latch and deadbolt motion. Compare case depth, pocket thickness and measured door dimensions with a case-fit calculator.
Lifting Tongs: Cross-Jaw Linkage Animation and Geometry Calculator
Explore a symmetric cross-jaw tong linkage with swivelling shoes. Compare jaw-end pivot span, visible contact gap and lifting-eye height as the linkage moves.
Knee-action Toggle Clamp: Over-centre Motion and Force Calculator
See a hold-down toggle pass through dead centre and meet its stop. Explore a defined four-bar force calculation while keeping clamping force separate from holding...
Four-Jaw Independent Chuck: TIR and Ideal Correction | FIRGELLI
Explore independent jaw adjustment and estimate ideal screw turns from initial TIR, target TIR and screw pitch, with clear measurement assumptions.
Expanding Pipe Stopper: Seal Geometry and Pressure Thrust | FIRGELLI
Explore a compression-plate pipe stopper. Compare ideal seal expansion and the separate axial thrust from back pressure; neither establishes holding capacity.
Draw Latch Mechanism Explained: How It Works, Parts, Over-Center Geometry & Clamp Force Formula
Explore an over-center draw latch and calculate ideal bail tension from hand force, handle length and the perpendicular moment arm at a selected angle.
De-sta-co Toggle Clamp Mechanism: How the Over-Centre Linkage Works, Parts and Uses Explained
Explore an equal-link push toggle passing through center to a stop. Calculate knee offset and setback, then compare an applied holding load with an applicable...
Compression Latch Mechanism: How It Works, Cam Diagram, Gasket Formula & Calculator
Explore compression-latch pull-up travel, axial gap and gasket compression. Compare the selected compression-phase angle with an illustrative travel law.
Collet Chuck Mechanism Explained: How It Works, Parts, Diagram, Formula and Calculator
Explore pullback collet motion and calculate ideal axial draw from bore, shank diameter and taper angle. Compare closure with an entered diameter limit.
Cam Latch Mechanism: How It Works, Diagram, Parts, Formula, and Uses Explained
Explore an eccentric compression-latch example. Compare panel draw, gasket compression, clamping force and signed handle torque through the closing stroke.
Cam Clamp Mechanism Explained: How It Works, Diagram, Formula, and Real-World Uses
Explore a constant-angle spiral cam and guided jaw. Compare camming angle with friction angle to check ideal self-locking; this model does not calculate holding force.
C-clamp Mechanism Explained: How It Works, Parts, Clamping Force Formula & Uses
Explore a C-clamp’s screw, swivel pad and frame. Estimate axial contact force from torque, screw lead and assumed effective efficiency.
Bench Clamp (form) Mechanism: How It Works, Diagram, Formula & Clamping Force Calculator
Explore a direct screw bench clamp. Estimate axial force from torque, threads per inch and assumed overall efficiency, with approach, contact and release animation.
Bar Clamp Mechanism Explained: How It Works, Parts, Clamping Force Formula and Uses
How a Bar Clamp works, the clamping force formula, real woodworking and welding applications, plus sizing rules and troubleshooting tips from FIRGELLI engineers.
The Wedge: Ideal Geometry and Force-ratio Calculator
Explore a symmetric wedge and calculate its included angle, displacement ratio and ideal per-face lateral force. Friction, cutting and material failure are not modeled.
Resolution of Suspension: Ideal Two-leg Tension Calculator
Resolve a centered static load into two equal leg tensions using the included angle. The tool illustrates equilibrium and does not select rigging or establish...
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.