Recent Blogs
Traction Recording Dynamometer Mechanism: How It Works, Diagram, Parts, Formula and Uses
Traction recording dynamometers measure drawbar pull on tractors, locomotives and ploughs. Learn how the spring-and-drum mechanism logs force vs distance.
Tracing Bar Mechanism: How It Works, Parts, Formula, and Drafting Uses Explained
Tracing Bar explained — how draughtsmen and instrument makers use a sliding bar with a stylus to copy, scale, and transfer curves with sub-millimetre accuracy.
Pressure Gauge (form 3) Mechanism Explained: How It Works, Diagram, Parts & Uses
Form 3 pressure gauge explained — how the back-flange Bourdon tube works, sizing rules, panel-mount applications, and a worked example for hydraulic test rigs.
Pressure Gauge (form 2) Mechanism Explained: How Diaphragm Gauges Work, Parts, Formula & Uses
Diaphragm pressure gauge explained — how it works, accuracy, formula, and worked example for HVAC, food processing, and chemical dosing systems.
Pressure Gauge (form 1) Mechanism Explained: Bourdon Tube Parts, How It Works, Diagram & Uses
How a Bourdon-tube Pressure Gauge works, with the formula, a worked brewery steam-jacket example, failure modes, and selection rules for industrial use.
Parabola Scriber Mechanism: How the Focus-Directrix Linkage Draws a True Parabola
A Parabola Scriber draws true parabolic curves directly on stock for solar dish layout, antenna reflectors, and optical tooling. Geometry, formulas, examples.
Parabola Drawing Instrument Mechanism: How It Works, Parts, Focus-Directrix Diagram and Uses Explained
How a Parabola Drawing Instrument traces true parabolic curves for optics, antenna dish layout, and architectural drafting — geometry, formulas, worked example.
Operation of a Counter: Mechanism, Geneva Carry Diagram, Parts and Uses Explained
How a mechanical or electronic counter works, the formula for pulse-to-revolution conversion, and worked examples for power measurement on rotating machinery.
Neer's Rotary Transmitting Dynamometer Explained: How It Works, Diagram, Parts, Formula & Uses
Neer's Rotary Transmitting Dynamometer measures shaft power inline by reading the angular twist of a calibrated torsion bar. Used in marine and industrial drive testing.
Micrometer Screw Adjustment Mechanism Explained: Parts, Diagram, Formula, and Precision Uses
Micrometer screw adjustment delivers sub-micron positioning for optics, metrology and machining. See the formula, worked example and selection guide from FIRGELLI.
Meter Dial Mechanism Explained: Parts, How It Works, Accuracy Zones and FSD Diagram
Meter dials translate shaft motion into a calibrated angular reading on instruments like wattmeters, ammeters, and torque arms. See how engineers spec them.
Lippincott Planimeter Mechanism: How It Works, Parts, and MEP Measurement Explained
How the Lippincott Planimeter measures indicator-diagram area to compute mean effective pressure and engine power, with formula, worked example, and uses.
Lazy-tongs Pantograph Mechanism: How It Works, Parts, Scale Formula & Engraving Uses Explained
How a lazy-tongs pantograph copies and scales drawings using crossed extensible links. Used in drafting, sign-making, and engraving since the 1600s.
Hyperbola Scriber Mechanism: How It Works, Parts, Formula, and Drafting Uses Explained
Hyperbola scribers draw true conic curves for optics, drafting and stonework. See how the string-and-pin method works, with formulas and a worked example.
Helicograph Mechanism Explained: Parts, Archimedean Spiral Formula, and Drafting Uses
Helicograph explained — how this geometric drawing instrument generates precise helical and spiral curves for engineering, surveying, and pattern layout work.
Geared Ellipsograph Mechanism: How It Works, Cardan-Circle Geometry, Parts, and Uses Explained
Geared ellipsograph explained — how the 2:1 epicyclic gearing traces true ellipses for draughting, optics tooling, and architectural layout. Formula, examples, specs.
Friction Test Mechanism: How It Works, Tribometer Parts, Coefficient Formula and Uses Explained
Friction Test explained — how engineers measure static and kinetic coefficients of friction, the formulas, real lab setups, and worked example for slip-critical bolted joints.
Friction Machine Mechanism: How a Prony Brake Dynamometer Measures Torque and Brake Power
How a friction machine measures shaft power through a calibrated brake band. Formulas, worked example, and real lab applications for engineering teams.
Flexible Curve Scriber Mechanism Explained: Parts, How It Works, Diagram and Bending Formula
How a Flexible Curve Scriber traces irregular curves for naval architects, patternmakers and surveyors — bending mechanism, accuracy limits, and worked examples.
Engine Counter Mechanism: How It Works, Diagram, Worm-Gear Parts, RPM Formula & Uses
Engine counter explained — how mechanical revolution counters measure engine power output, used in dyno labs, marine diesels, and stationary genset testing.
Ellipsograph Turntable Mechanism: How It Works, Parts, Formula and Diagram Explained
How an Ellipsograph Turntable draws true ellipses for draughtsmen, jewellers and pattern-makers — geometry, formula, worked example, and selection trade-offs.
Eidograph Mechanism Explained: Parallel-Bar Drawing Copier, How It Works, Parts, Formula, Diagram
Eidograph explained — how the pivoted-bar copying mechanism scales drawings, where it beats the pantograph, and how draughtsmen still use it today.
Dynamometer (rope/strap Brake) Mechanism: How It Works, Diagram, Parts, Formula and Uses Explained
Rope brake dynamometer explained — how the strap brake measures engine power, sizing math, worked example, and real lab applications for engineers and students.
Dynamometer (form) Mechanism Explained: How It Works, Parts, Diagram, Formula & Uses
Dynamometer explained — how it measures torque, force and power, with worked numbers, real machines, and selection rules for engine, motor and brake testing.
Drawing Instrument (form) Mechanism: How It Works, Parts, Diagram & Error Calculator
How a drawing instrument form works in technical drafting — geometry, tolerances, and accuracy targets used in engineering, cartography, and architecture.