Recent Blogs
Mauser 98 Bolt Action: Historical Sequence and Model Boundaries
Explore five broad states of a historical Mauser-pattern turning bolt in a simplified, non-operational viewer. No strength or operating performance is calculated.
Martini-henry Rifle: Mechanism, How It Works, Diagrams, Detailed Explanation
How the Martini-Henry rifle's falling-block action works, with breech mechanics, lever geometry, and a worked extraction-force example for collectors and restorers.
Mainspring: Ideal Elastic-Strip Bending Estimate
Explore a mainspring barrel and arbor. Compare ideal strip torque, winding angle and stored energy under a uniform elastic-bending assumption.
Magnetorheological Damper: Annular-Flow Topology and Local Bingham Estimate
Explore an MR damper's piston, coil and annular passages. Compare ideal local yield and viscous shear-force contributions using entered material and gap values.
Lobe Pump Mechanism Explained: How It Works, Parts, Diagram, and Sanitary Pumping Uses
See how timed lobe rotors carry liquid around a pump casing. Calculate theoretical flow and compare it with flow adjusted by an entered volumetric efficiency.
Limit Switch: Plunger Animation and Datasheet Current Comparison
See a plunger switch change its normally open and normally closed contacts. Compare load current with a specified Honeywell LS2 AC15 carry/break rating.
Lever Tumbler Lock: Gate Animation and Nominal Combination Calculator
See how aligned lever gates allow a lock’s bolt fence to pass. Calculate nominal combinations from independent lever settings and a stated exclusion count.
Lee-Metford Magazine: Historic Component Cross-Section
An inert historical component map identifying five features in the 1899 Lee magazine cross-section: case, follower, spring, retaining projections and two-column arrangement.
Lebel Mle 1886 M.93: Museum Component Map
An inert museum component map of the Lebel Mle 1886 M.93, identifying the barrel, receiver, bolt, tubular magazine, spring, follower and carrier.
Kinematic Chain: Four-Bar Animation and Mobility Count | FIRGELLI
Explore a fixed four-bar linkage and calculate the planar lower-pair count 3(n−1)−2j. Link and joint totals do not specify geometry or establish constraint independence.
Karrusel Watch Mechanism and Separate Static-Load Calculator | FIRGELLI
See an illustrative rotating watch carriage and oscillating balance. A separate weight-and-moment calculator demonstrates general statics; it does not predict watch loads or timekeeping.
Jaw Coupling: Aligned Illustration and Torque Comparison Calculator | FIRGELLI
Compare entered load and rated torque and view an aligned jaw-and-spider section. Angle and offset use stated reference denominators, not universal allowable limits.
Iron Frame Turn-table: Ideal Support-Reaction Calculator | FIRGELLI
Calculate ideal reactions for an offset load between two supports, plus weight, overturning moment and a selected-radius friction estimate. The model does not rate turntable...
Inertia Wheel Pendulum: Reaction Torque Calculator | FIRGELLI
Compare ideal wheel torque, carrier reaction and a simplified arm-acceleration value. Gravity, pendulum motion, motor limits and feedback control are not simulated.
Indexing Motion: External Geneva Phase Calculator | FIRGELLI
Calculate ideal output step and index/dwell fractions for a standard external Geneva. An optional reference span rescales the reported phase angles.
Idler Wheel: Equal-Tension Resultant Load Calculator | FIRGELLI
Calculate an ideal idler load from two equal belt-span tensions and belt direction change. Actual drive tensions, shaft stress and bearing life are not calculated.
Hydraulic Shock Absorber: Energy and Average Force Calculator | FIRGELLI
Calculate equivalent average resisting force from energy and stroke, or stroke from an entered average-force threshold. Peak force and shock-absorber capacity are not calculated.
Hydraulic Servo: Ideal Bore and Tolerance Calculator | FIRGELLI
Calculate ideal circular bore from pressure and a multiplied mass-equivalent load, plus an independent ±tolerance band. Servo response and achievable accuracy are not calculated.
Hart's W-frame: Crossed-Link Animation and Stroke Calculator
See a Hart W-frame maintain an ideal straight tracing path. Compare bar sizes, input swing and stroke with a connected crossed-link animation.
Hart's A-frame: Straight-Line Linkage and Interactive Animation
Explore Hart's A-frame with connected rigid links and a straight tracing path. Compare bar dimensions and distinguish ideal geometry from build accuracy.
Hairspring: Balance Frequency and Energy Calculator | FIRGELLI
Compare ideal hairspring frequency, beats per hour, spring energy and rate change from stiffness trim. Includes a slowed balance-and-spring animation.
Gyroscope Mechanism Explained: How It Works, Parts, Precession Formula and Real-World Uses
How a gyroscope works, the precession formula, and real applications in aerospace, marine stabilisers, MEMS phones, and inertial navigation. Practical engineer's guide.
Gun Lock: Historical Meaning and Hiscox Illustration
See Hiscox’s historical gun-lock illustration and understand the distinction between a firearm’s firing lock and a modern storage lock.
Grid Coupling: Spring-Grid Animation and Torque Calculator
See a serpentine steel grid connect two slotted hubs. Calculate running torque, a service-factor comparison and equivalent tangential force from power and speed.
Gimbal Motion: Angle-Cancellation Calculator | FIRGELLI
Explore gimbal pivots and compare one rocking angle with an assumed cancellation percentage. Calculate pivot amplitude and residual payload tilt.