Recent Blogs
Flanged Flat-Belt Pulley: Rim Width and Clearance | FIRGELLI
Understand flange spacing, belt width and side clearance. Includes a cross-section, simple width examples and the distinction between tracking and edge restraint.
Expanding Pulley: V-Groove Geometry Calculator | FIRGELLI
Explore opposed conical sheaves and calculate pitch-diameter change from axial closure and groove angle. This model covers one pulley rather than a full drive.
Detachable Chain Link: Spring-Clip Roller-Chain Assembly and Load Comparison
See how a spring-clip roller-chain connecting link assembles, and compare static tension in two strands with an assumed strength threshold.
Crossed Belt Drive Mechanism: How It Works, Diagram, Belt Length Formula, Parts and Uses
Explore crossed-belt geometry and opposite pulley rotation. Calculate ideal centerline length, speed ratio, wrap angle and center-distance-to-width ratio.
Concave-grooved Pulley for Round Band: How It Works, Groove Sizing, Diagram & Uses
Explore a round belt in a concave pulley groove. Compare cord diameter, groove radius and depth in an enlarged section; belt motion is illustrative.
Chain and Pulley (form 2) Mechanism Explained: How It Works, Parts, Formula and Uses
Explore a rimmed chain wheel with teeth entering rectangular link openings. Calculate chain advance, compare pitch dimensions and find round-wire cross-sectional area.
Chain and Pulley (form 1) Mechanism Explained: How It Works, Diagram, Parts and Uses
See alternating-plane chain links engage a toothed wheel. Separately compare a load with hand pull to calculate the overall force ratio a complete system would...
Galle Chain Mechanism: Plate Stacks, Cross-Pins and Load Comparison
Explore Galle chain’s spaced plate strands and exposed cross-pins. Compare entered tensile loads, assumed load sharing and length from chain pitch.
Belt with Movable Tightening Pulley: How It Works, Parts, Formula, and Uses Explained
Explore a movable backside idler and compare ball-bearing basic rating life at two equivalent loads, with the same bearing and speed. Spring sizing is not...
Belt Engage/disengage/reverse for Upright Shaft Mechanism: How It Works, Diagram & Parts
Explore a single-belt reversing drive with concentric shafts, a loose centre pulley and opposed bevel gears. Compare pulley spacing, fork opening and force units.
Belt at Right Angles, Axes in Same Plane: Quarter-Turn Belt Drive Mechanism Explained
Explore an open flat-belt route with guide pulleys between perpendicular coplanar shafts. Compare pulley diameters, centre distance and belt-width references.
Belt at Right Angles Without Guide Pulleys: How a Quarter-Turn Flat Belt Drive Works
Explore a quarter-turn flat belt between perpendicular shafts without guide pulleys. Compare pulley sizes and a selected spacing reference in an animated layout.
Belt at Right Angles via Guide Pulleys: How the Quarter-Turn Drive Mechanism Works
Learn how a belt at right angles via guide pulleys transfers power between perpendicular shafts in conveyor, textile and industrial drive systems.
Open Belt Drive: Brown Movement 1
Explore same-direction rotation in an open belt drive. Calculate ideal belt speed and driven-pulley speed from pitch diameters and driver speed.
Anti-friction Bearing for Pulley Mechanism: How It Works, Parts, L10 Life Formula & Diagram
See a pulley turn on a ball bearing and compare basic L10 fatigue life at three steady loads. Explore rating, load and speed without treating...
Round-rope Drive Mechanism: How It Works, V-Groove Wedge Friction, Parts and Uses Explained
Round-rope Drive explained — how rope-and-grooved-pulley power transmission works, the math behind it, and real applications from textile mills to mine haulage.
V-grooved Rope Pulley: Ideal Groove-reaction Geometry
Compare ideal symmetric flank reactions for an entered V-groove angle. Clearance and wrap are displayed separately; traction, slip and drive capacity are not calculated.
Quarter-Turn V-Belt Drive: Gates Guideline Comparison
Quarter-turn Belt Drive explained — how the 90° twist transmits power between perpendicular shafts, design rules, and real industrial applications.
Trolley Car: Overhead Supply and Steady DC Power Calculator
Explore overhead current collection and rail return. Calculate ideal steady input power and current from motor output, motor count, voltage and entered efficiency.
Triple-expansion Engine and Multipolar Dynamo: Power-band Comparison
Explore serial steam expansion and a coupled dynamo. Compare a selected percentage band around entered shaft power; engine and generator performance are not calculated.
Telephone Transmitter: Fixed-voltage Resistance Comparison
Explore a carbon transmitter concept and compare two entered resistance states with Ohm’s law. Sound pressure and microphone sensitivity are not calculated.
Telephone Receiver: History and Ideal Conductor-force Calculator
Explore a historical electromagnetic receiver and a separate ideal BIL conductor-force calculation. Diaphragm force and acoustic output are not predicted.
Street Railway Single Motor: Traction Gear-ratio Calculator
Explore axle-hung motor support and ideal pinion-to-axle gearing. Calculate gear ratio, axle RPM and torque factor from entered tooth counts and motor speed.
Sparking Dynamo Mechanism: How It Works, Commutator Parts, Diagram, and Spark Energy Calculator
Sparking Dynamo explained — how the commutator brush gap throws visible sparks, why engineers used it for ignition, and where it still appears in industrial...
Solenoid Electric Fan Mechanism: How It Works, Parts, Diagram, and Resonance Formula Explained
Solenoid electric fans use a coil-and-armature pulse to drive blades for ventilation in HVAC, automotive cooling, and industrial enclosure applications.