Recent Blogs
Pin Wheel and Slotted Pinion: Three Selectable Speed Changes
How a pin-wheel and slotted pinion converts continuous rotation into stepped indexing motion — design rules, formulas, and real-world examples from packaging and watchmaking.
Oblique-Tooth Gears Form 2: Brown Movement 41
Explore the double-oblique gear pair in Brown movement 41. Calculate ideal driven speed, reduction ratio and mesh-event rate from tooth counts and input speed.
Oblique-Tooth Gears Form 1: Brown Movement 40
Explore the single-oblique tooth pair in Brown movement 40. Calculate ideal driven speed, reduction ratio and mesh-event rate from tooth counts and input speed.
Oblique-Shaft Gears Form 2: Brown Movement 43
Explore the shallow bevel-like gear pair in Brown movement 43. Calculate ideal driven speed, tooth-count ratio and mesh-event rate.
Oblique-Shaft Gears Form 1: Brown Movement 42
Explore crossed cylindrical helical gears on oblique shafts. Calculate ideal driven speed, tooth-count ratio and mesh-event rate for Brown movement 42.
Brown Movement 27: Three-Roller Carrier and Radial-Groove Wheel
Explore Brown movement 27: a triangular three-roller carrier and radial-groove wheel. Calculate roller pitch and radial-distance limits from center offset and orbit.
Multiple-Speed Gear Set: Three Selectable Fixed-Center Ratios
Compare three selectable spur-gear ratios at one shaft center distance. Calculate ideal output speed from tooth counts, input rpm and common module.
Rolling Contact: Ideal No-Slip Cylinder Ratio and Travel
Calculate the ideal ratio, opposite follower rotation, surface travel and center distance of two externally tangent cylinders rolling without slip.
Link Chain Hoist: Manual-Hoist Animation and Ideal Hand-Pull Calculator
Follow a manual chain hoist from hand chain to load hook. Calculate ideal hand pull from load mass and an entered mechanical advantage.
Irregular Vibratory Motion: Normalized Speed-Profile Calculator | FIRGELLI
Compare modulation depths implied by two peak-to-minimum speed ratios for a stated sinusoidal law. The plot does not calculate gears, machine vibration or screening performance.
Irregular Circular Motion: Eccentric Gear Train and Speed Calculator
Follow an eccentric circular gear and moving idler driving a fixed-axis output. Explore the speed variation of an illustrative gear-and-link arrangement.
Internal Worm Wheel: Ratio and Assumed-Efficiency Calculator | FIRGELLI
Calculate an ideal worm-input reduction, wheel speed, torque and power loss using an entered efficiency. Physical contact and self-locking are not determined.
Intermittent Spur Gear: Angular Closure Calculator | FIRGELLI
Compare toothed and locking angle shares and their signed difference from 360°. Tooth geometry, output travel and locking clearances are not calculated.
Intermittent Gears: Angular Segment Calculator | FIRGELLI
Compare toothed and locking angle shares and check whether they total 360°. Output travel, tooth geometry and working lock dimensions are not calculated.
Hypocyclic Gear Train: Fixed-Ring Count-Ratio Calculator | FIRGELLI
Compare ideal fixed-ring speed-ratio magnitudes and output rotation from ring and inner counts. Tooth profiles, output geometry and load capacity are not calculated.
Hunting Tooth Worm Gear: History and Pairing Calculator | FIRGELLI
Learn about Hiscox’s two-wheel hunting tooth arrangement and explore a separate modular pairing calculator for worm starts, wheel teeth and repeat intervals.
Friction-clutch Wheels: Torque Threshold and Demand | FIRGELLI
Compare ideal wheel-contact torque with load demand using coefficient, normal force and radius. Understand margin, demand excess and the limits of slip modeling.
Friction Gearing: Driver Torque and Utilization | FIRGELLI
Compare a driver-shaft friction torque limit with demand using normal force, coefficient and driver radius. Keep driver and follower torque distinct.
Friction Disc and Roller: Speed and Disc Torque | FIRGELLI
Calculate ideal roller speed and disc-side torque from contact radius, roller radius, normal force and friction, with separate input/output torque meanings.
Friction Cone Variator: Contact Radius and Roller Speed
See a rotating cone drive a movable friction roller. Compare output speed and contact surface speed from cone radius, roller radius and input RPM.
Flying Machine: Rotating-Arm Worm Drive Calculator | FIRGELLI
Explore a worm-driven rotating arm. Compare speed reduction and assumed torque multiplication while keeping backdrive behavior and actual load capacity separate.
Evans Friction Cones: Ring-Belt Ratio Calculator | FIRGELLI
Move a leather ring between opposed friction cones and compare mean contact diameters and ideal speed ratio. Finite ring width introduces slip.
Equalizing Pulley: Sheave Motion, Rope Tension and Calculator
Explore an equalizer sheave with two vertical rope legs. Compare ideal tension, sheave-to-rope ratio, groove clearance and a measured breakaway difference.
Epicyclic Train (slow-motion Form) Mechanism Explained: How It Works, Diagram, Parts and Uses
Explore a two-ring compound epicyclic train. Compare signed output motion, reduction magnitude and module scaling needed for a common carrier radius.
Epicyclic Train (form 5) Mechanism Explained: How It Works, Diagram, Formula & Calculator
Explore a carrier-driven planetary step-up with fixed ring and sun output. Compare speed multiplication and ideal torque fraction from ring and sun tooth counts.