Recent Blogs
Cable Robot Mechanism Explained: How Cable-Driven Parallel Robots (CDPRs) Work, Parts and Uses
Explore a four-cable planar robot example. Change frame dimensions and target position to compare selected-target and live free-span cable lengths.
Mercury Tilt Switch: Make and Break Angle Calculator
Explore a mercury tilt switch and compare make and break thresholds after applying a mounting offset to manufacturer-specified angles.
Human Treadmill Mechanism Explained: Belt, Deck, Drive Roller, Incline Actuator and Motor Power
How a human treadmill mechanism works — belt, deck, rollers, drive motor — with formulas, sizing examples and real applications in fitness, rehab and gait...
Hotchkiss Magazine Gun: Historical and Museum References | FIRGELLI
Historical context for the Hotchkiss magazine rifle, with Winchester-Hotchkiss museum records and a reference to Hiscox’s mechanical collection.
Hand Pump: Displacement, Flow and Force Calculator | FIRGELLI
Understand a piston lift pump and calculate water per cycle, estimated flow and hydrostatic force from bore, stroke, rate, efficiency and lift height.
Bellows Coupling Mechanism Explained: How It Works, Diagram, Parts, Formula and CNC Servo Uses
Bellows couplings transmit torque between misaligned shafts in CNC and servo systems. Learn how they work, sizing math, failure modes, and selection tradeoffs.
Worm-gear Winch: How It Works, Parts and Drum-Rotation Calculator
Explore worm-gear winch rotation. Calculate reduction ratio and ideal drum turns from wheel teeth, worm starts and crank turns; no lifting rating is calculated.
Wooden Frame Turntable: Entered Static-load Allowance
Apply chosen derating factors to an entered central bearing rating and compare a centered payload. Bearing life, off-axis loads and wooden frame strength are not...
Windlass Mechanism Explained: How It Works, Parts, Formula, Diagram, and Calculator
Explore the ideal force balance between a windlass crank and drum. Adjust fixed radii and load mass; the results do not establish a lifting capacity.
Winchester Magazine Rifle: Historical Mechanism Illustration
An educational illustration of the historical Winchester magazine-rifle arrangement, with the limits of the simplified diagram stated alongside it.
Winch Mechanism Explained: Diagram, Parts, Gear Reduction and Line Pull Calculator
Compare ideal hand-crank torque and winch line pull from gear ratio and drum radius. The results are calculations of ideal force, not lifting ratings.
Wheel Train Mechanism Explained: How It Works, Gear Ratio Formula, Parts, and Horology Uses
Explore three ideal gear-train stages. Compare the combined speed multiplier, output rate, revolution time and lossless torque ratio.
Wheel Hub Assembly: Ideal Moment and Bearing-row Reaction Calculator
Explore an ideal hub moment and two-row bearing reaction. The calculator does not predict bearing life, preload, runout or a safe hub rating.
Wheel and Axle Mechanism: How It Works, Formula, Diagram, and Real-World Uses Explained
Explore a wheel and axle rotating together. Compare ideal mechanical advantage and the distance travelled at each radius during one revolution.
Wafer Tumbler Lock: Illustration and Single-offset Comparison
Explore a generic wafer and plug boundary with a one-offset tolerance comparison. The tool does not predict lock operation, security or a physical jam angle.
Viscous Damper: Animation, Force-Law and Work Calculator
Evaluate an entered viscous damping law at one speed. Calculate force magnitude, instantaneous dissipated power and a constant-force work estimate.
Viscous Coupling: Plate Animation and Normalized Comparison Calculator
Explore interleaved plates in a viscous coupling and compare normalized speed indices, gap and viscosity. The comparison proxy is not transmitted torque.
Typewriter Action: Schematic Motion and Displacement Comparison
Explore a key, typebar and escapement sequence. Compare scaled displacement and average speed using an entered ratio and time; actual impact and typing rate are...
Trundle Wheel: Ideal Rolling Distance Calculator
Calculate ideal distance from wheel diameter and full revolutions, then compare it with a target. The model assumes no slip and does not replace wheel...
Tripod: Ideal Leg Splay and Footprint Geometry
Calculate ideal footprint size and apex height for three equal legs. Compare a separate two-point slope without predicting tipping stability or platform level.
Treadle Mechanism: Pitman, Flywheel and Ideal Rate Comparison
Explore a treadle and pitman driving a flywheel. Compare entered cycle rate, speed multiplier and crank dimensions without predicting power or linkage fit.
Tourbillon: Rotating Cage and Timing Calculator
Explore the rotating cage and convert balance frequency, cage period and elapsed time into timing quantities. The calculator does not predict watch accuracy.
Toggle Switch: Snap-action Arrangement and Observation Calculator
Explore snap-action switch components and calculate midpoints, reciprocal travel times and event rates from entered observations. No product performance is predicted.
Tipping-bucket Rain Gauge: Raw Count and Rainfall Conversion
Convert completed tips and a calibrated increment to accumulated depth and interval-average rainfall rate. No exposure, dynamic or calibration correction is applied.
Tilting-disc Check Valve: Eccentric-pivot Geometry
Explore eccentric disc-pivot dimensions and ideal thin-disc projected opening. The calculator does not predict flow, closure time, slam or valve selection.