Recent Blogs
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.
Rock-drill Tappet Valve: Concept and Rate Interpolation
Explore a conceptual rock-drill valve alongside a two-point rate interpolation. Entered anchors do not predict real pressure, impact or pneumatic performance.
Steam Hoisting Engine Mechanism: How Mine Winders Work, Parts, Diagram, and Rope Speed Formula
How a Steam Hoisting Engine lifts ore and miners up a vertical shaft — drum sizing, rope speed, named installations, and a worked example for...
Portable Diamond Core Drill: Declared Annular Geometry and Kinematics
Portable diamond drills cut continuous core samples for mineral exploration. Learn how the bit, swivel, and feed system work, with sizing math and field examples.
Log Conveyor: Discrete Log Spacing and Rate
Explore discrete logs moving on a chain conveyor. Calculate ideal logs per minute, time between logs and mass flow from spacing, speed and average log...
Hunt Conveyor Driving Mechanism: Fixed Cam, Pawls and Chain Calculator
See a fixed cam guide rotating pawls into conveyor-chain pins. Calculate chain travel, speed, ideal faceplate torque and useful power for a six-pawl layout.
Windmill and Steel Tower: Hypothetical Pumping Sensitivity
Explore a hypothetical wind-pump scaling model. Its assumed delivery curve illustrates sensitivity and does not select a pump or predict site performance.
Hydraulic Air Compressor: Static Head and Pressure Calculator | FIRGELLI
Learn the falling-water air-compression principle and compare static water head, gauge pressure, absolute pressure and ideal isothermal gas volume. Air delivery is not calculated.
Direct Air Pressure Pump Mechanism: How It Works, Parts, Formula and Uses Explained
Follow two water chambers driven alternately by air pressure and suction. Calculate nominal water displacement flow and compare chamber pressure with static lift.
Proportional Dividers: Exact Similar-Triangle Scaling
How proportion compasses and hyperbola-drawing linkages work, with the geometry, real shop scenarios, and a worked example for pattern-makers and drafters.
Watt Parallel Motion: Linkage Illustration and Coupler Division
Explore a fixed illustrative Watt four-bar and calculate an inverse-length coupler division. Entered dimensions do not define a complete custom linkage.
Leg-of-mutton Sail Mechanism Explained: How It Works, Parts, Uses, and Aerodynamic Force Diagram
A historical leg-of-mutton sail profile with a first-order lift-only calculator using triangular area, wind speed, entered lift coefficient and declared mathematical axes.
Lateen-rigged Felucca Mechanism Explained: Sail Diagram, Parts, Rig Geometry & Uses
Explore the two-masted lateen-rigged felucca and an interactive yard-hoisting diagram with adjustable yard, mast, halyard and rake proportions.
Floating Dry-dock: Ballast, Buoyancy and Ship Support | FIRGELLI
Learn how a floating dry-dock lifts a supported vessel. Distinguish displaced-water volume from ballast pump-out volume using a clear buoyancy example.
Whitworth Quick-return: Angular Timing and Clearance Comparison
Compare ideal working and return crank sweeps, plus clearance against an assumed 0.050 mm reference. Stroke, linkage closure and wear are not calculated.
Travelling Crane: Plan-view Geometry Calculator
Compare bridge span and an illustrative endpoint offset. Calculate geometric skew angle, offset/span ratio, a selected length quotient and diagonal excess.
Barrel Cam: Rise–Dwell–Return Timing
Explore barrel-cam rise, dwell and return phases. Check that angles fit one revolution and calculate mean follower speeds and dwell time.
External Geneva Drive: Index and Dwell
Explore an external Geneva drive and calculate index, engagement and dwell angles from slot count, plus the driver period from rotation speed.
Hirth Coupling Indexing: Ideal Pitch and Angle Calculator | FIRGELLI
Find the nearest whole-tooth index, angular pitch and target residual for an entered tooth count. Manufacturing accuracy, repeatability and torque capacity are not calculated.
Curvic Coupling Indexing Mechanism Explained: How It Works, Parts, Formula and Uses
See Curvic coupling faces separate, index and re-engage. Calculate angular tooth pitch, requested move angle and available positions without confusing pitch with accuracy.
Stud-and-Hole Clutch: Animation and Index Calculator | FIRGELLI
See one radial pin couple two rotating members. Calculate hole pitch, arc spacing, pin area and an ideal torque estimate from an entered shear-stress assumption.
Sliding Clutch-box Mechanism Explained: How It Works, Parts, Diagram, Formula and Uses
Sliding Clutch-box explained — how the sliding dog clutch engages gears in tractors, lathes, and gearboxes, with formulas, tolerances, and a worked example.
Frictional Clutch-box: Plate-stack Torque Calculator | FIRGELLI
Compare ideal plate-clutch torque capacity with demand using clamp force, coefficient, mean radius and active interfaces. Read force sums and torque margin.