Recent Blogs
Locking Pliers: Over-Centre Link Geometry Explained
Explore a locking-pliers toggle and its main components. Calculate angle and axial projection for a selected local link length and past-center offset.
Stillson Pipe Wrench: Applied Torque and Documented Jaw Action
How a Stillson pipe wrench works — the floating-jaw cam action, bite angle math, and real plumbing and pipefitting applications with sizing guidance.
Tongue-and-groove Pliers: Adjustable Pivot and Assumed Force Ratio
Explore selectable jaw spacing and multiply an entered handle force by an assumed ideal ratio. The result is an arithmetic comparison, not actual grip force.
Toggle Bolt: Wing Movement and Product-table Comparison
Explore a spring-wing toggle and selected rows from a cited TOGGLER table. Installation dimensions and loads apply to that product and substrate only.
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.
Multiple-Bladed Sheep Shears: Sliding Plates and Slot-Limited Travel
Explore historical multiple-bladed sheep shears with sliding plates and a screw-in-slot stop. Calculate usable travel and the remaining distance to the stop.
Machine Sheep Shears: Crank, Reciprocating Cutter and Comb
Explore a reciprocating sheep-shear cutter and fixed comb. Calculate ideal frequency, stroke and accumulated travel from drive speed, cycle ratio and crank radius.
Horse Clipper: Cutter Motion and Ideal Eccentric Calculator | FIRGELLI
Compare full stroke and complete-cycle rate in an ideal eccentric cutter model. Calculate eccentric radius and peak speed, without motor sizing or animal-care predictions.
Fiddle Drill: Bow Travel and Alternating Rotation Calculator | FIRGELLI
Calculate turns per one-way bow stroke and average rotational travel from contact diameter, bow travel and stroke rate. Includes an alternating-motion animation.
Drill (general) Mechanism Explained: How It Works, Parts, RPM Formula and Uses
Convert a cutting-speed target and drill diameter into spindle RPM. Inspect a rotating twist drill and compare the target with an entered machine limit.
Cramp Drill (form 2) Mechanism Explained: How the Screw-Feed Hand Drill Works, Parts and Uses
Explore Brown’s second cramp drill, with a spindle inside a hollow feed screw. Calculate spindle speed, axial feed, feed per bit revolution and ideal feed...
Cramp Drill (form 1) Mechanism Explained: How the Screw-Feed Hand Drill Works, Parts & Uses
Explore Brown’s first cramp drill with separate drill and feed controls. Calculate screw turns, axial feed, ideal feed time and feed-handle travel.
Bolt Cutters Mechanism Explained: Compound Leverage, Diagram, Animation, Calculator and FAQ
Explore compound bolt-cutter motion and compare jaw-contact force from hand force, two entered stage ratios and assumed overall efficiency. Tool capacity is separate.
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.