Recent Blogs
Wooden Road Bridge Truss: Ideal Support-reaction Calculator
Place one point load along a simply supported span and calculate left and right reactions. Truss member forces, timber capacity and bridge safety are not...
Suspension Bridges Mechanism: How Cable Tension, Towers, and Anchorages Work — Diagram & Calculator
See how suspenders, cables, towers and anchorages carry bridge loads. Explore ideal main-cable tension from span, load and sag with a statics calculator.
Shears with Winch or Tackle Block: How It Works, Diagram, Formula & Rigging Uses Explained
How a shears lifting rig works — the geometry, the tackle block math, and how riggers use it to set heavy loads on bridges, masts,...
Deck Bridge Trusses Explained: How They Work, Load Path Diagram, Parts, Uses, and Top-Chord Formula
Explore load transfer through an eight-panel deck truss. Calculate reactions, peak moment and top-chord compression for load assigned to one truss.
Bridge Truss Mechanism Explained: How It Works, Parts, Forces and Span Uses
Explore a Pratt-style side truss. Compare joint-equilibrium member forces and support reactions with beam estimates under a uniform load delivered at panel points.
Lewis Stone Lifter: Patent Component Map
Identify the jaws, central spreader, socket and upper connection of a patented Lewis stone lifter. Interactive highlights explain the arrangement without a load rating.
Wharf Crane: Load-radius and Counterweight Comparison
Explore a wharf-crane load and counterweight comparison. Adjust masses, radii and assumed factors; the results do not establish crane stability or capacity.
Truss Roof: Three-member Ideal Force Calculator
Explore an ideal three-member roof truss under a centered apex load. Calculate support reactions, rafter compression, tie tension and member length.
Toggle Stump Puller: Historical Arrangement and Ideal Toggle Ratios
Explore a historical stump-puller subject with an abstract two-link toggle model. Calculate ideal force and travel ratios, without predicting chain load or capacity.
Timber Splicing: Illustrative Scarf and Bolt-hole Dimensions
Explore nominal scarf-joint and bolt-hole dimensions. This drawing tool does not select a structural repair, assess fit or calculate joint capacity.
Timber Arches: Ideal Three-hinged Tied-arch Equilibrium
Compare ideal horizontal thrust and vertical reactions for a symmetric three-hinged parabolic tied arch under uniform load. This is not a structural design calculation.
Swivelling Dumping Car: Ideal Payload-moment Calculator
Compare payload weight and its ideal moments at two horizontal offsets from a tipping axis. The tool does not predict self-dumping or safe payload.
Swivel Shackle Slip Hook: Force-vector Illustration
Explore hook and swivel concepts alongside an illustrative cosine product. The calculation does not determine WLL, allowable load or permitted load direction.
Swinging Derrick Crane: Load-moment Comparison
Compare load times horizontal radius with an entered moment reference. Explore ideal moment arithmetic and illustrated boom geometry without inferring crane capacity.
Swing-boom Crane: Ideal Load-moment Calculator
Compare load-plus-hoist and uniform-boom weight moments from entered weights and distances. Results are moment demands, not crane capacity ratings.
Swing Derrick: Radius and Ideal Swing Calculator
Explore boom projection and ideal swing motion. Compare working radius, an entered moment/radius quotient, angular speed and hook plan speed.
Swing Bridge: Ideal Opening-motion Calculator
Explore a symmetric center-pivot swing bridge. Calculate ideal opening time, angular speed, half-span tip arc and speed from a constant entered slew rate.
Stone Grinding and Polishing: Guided-lap Animation and Calculator
Explore a single guided annular lap with a sliding shaft and universal joints. Calculate rim speed, turn count, guide path and nominal disk area.
Steel Arched Concrete Bridge Mechanism: How Melan Composite Arches Work, Parts, and Thrust Diagram
Steel Arched Concrete Bridge explained — how steel ribs embedded in concrete carry load, design ranges, span limits, and real bridge engineering examples.
Square Box Side-dumping Car Mechanism: How the Trunnion Pivot, Trip Latch, and Tipping Moment Work
Square box side-dumping cars tip their load sideways on construction and mining sites. See how the pivot, latch, and counterweight work, with real numbers.
Rolling Lift Bridge Mechanism: How Scherzer Bascule Spans Roll Open with Diagram and Calculator
Rolling lift bridge explained — how Scherzer-style bascule spans roll back on curved tread plates to clear shipping channels for rail and highway traffic.
Right and Left Hand Turnbuckle Mechanism: How It Works, Diagram, Parts and Uses Explained
Calculate turnbuckle take-up from equal thread pitch and body rotation. Opposite-hand threads move both ends, doubling the travel per revolution.
Releasing Grip: Latch Animation and Force-Ratio Calculator
Follow a hook-and-latch illustration and compare load divided by an entered force ratio. Includes a worked example and clear limits on what the calculation predicts.
Queen-Post Roof Truss: Ideal Apex-Joint Screen
Queen Post Roof Truss explained — geometry, loads, span limits, and a worked example for residential and barn construction. Practical engineering from FIRGELLI.
Twin-Shaft Pugmill: Hold-Up, Throughput, and Shaft-Turn Ledger
Pug mill explained — how the mixing shaft, paddles and discharge work in ceramics, brick making and soil stabilisation, with sizing math and a worked...