Recent Blogs
Plate Sawing Machine: Declared Circular-Blade Traverse Geometry
How a Plate Sawing Machine cuts thick steel plate to size — blade speed, feed rate, kerf control, and real shop examples from heavy fabrication...
Radial Pin Clutch: Clearance and One-Revolution Timing
Pin clutch explained — how the sliding pin engages a driven hub for single-revolution control on punch presses, mill drives, and packaging machinery.
Pendulum Saw: Swing Geometry and Blade Tip Speed
Explore pendulum-saw swing geometry. Calculate blade-edge speed, arbor arc travel, horizontal sweep and vertical drop from dimensions, rpm and parked angle.
Oil-Circulating Step: Hiscox Item 1283
Explore the grooved shaft foot and oil passages of Hiscox item 1283. Calculate section proportions for a vertical-shaft step bearing.
Multiple-Plate Friction Clutch: Active Interfaces and Ideal Torque
Explore a multi-plate friction clutch stack and calculate ideal uniform-wear torque from double-sided disc count, clamp force, friction coefficient and radii.
Multiple-Spindle Drilling Head: Common Drive and Simultaneous Feed
Explore a common-drive multiple-spindle drilling head. Calculate ideal spindle rpm from gear tooth counts and input speed, with schematic tool positions.
Modern Saw Cotton Gin: Cylinder Kinematics and Measured Output
Explore how a saw cotton gin separates lint from seed. Calculate saw-tip travel and convert an entered lint collection measurement into an hourly mass rate.
Eccentric Mangle Wheel: Guided Pinion and Variable-Speed Reversal
Explore an eccentric mangle wheel with a guided pinion. Calculate driving-pinion pitch diameter and speed; the guide drawing is qualitative.
Mangle-Rack Form 3: Module-Defined Pinion and Straight Run
Explore a guided mangle-rack path. Calculate pinion pitch diameter from metric module and tooth count, then estimate ideal straight-run speed and time.
Mangle-Rack Form 2: Guided Pinion and Straight-Run Estimate
Explore a reciprocating rack with guided pinion transfer. Calculate ideal straight-run pitch travel, speed, revolutions and time from entered dimensions.
Hanger Journal Bearing Lubrication: Oil Ring and Sommerfeld Number
Explore oil-ring lubrication in a hanger journal bearing. Calculate a defined Sommerfeld number, clearance ratio, journal surface speed and diametral clearance.
Jacquard Loom: Hooks, Harness Cords and Repeated Ties
Explore Jacquard hooks, harness cords and repeated ties. Calculate allocated hook positions, repeated warp ends and patterned width for the stated tie convention.
Loom Dobby Mechanism: Hook, Knife and Heald-Shaft Selection
Explore how a hook-and-knife dobby selects heald shafts. Convert loom pick rate and user-defined crank-angle intervals into pick period and elapsed time.
Lenticular Step Bearing: Pressure-Oil-Fed Vertical-Shaft Arrangement
A vertical-shaft lenticular step bearing with alternating bronze and steel discs, central pressure-oil feed, water cooling and a limited nominal F/A pressure check.
Lens-grinding Machine: Historical Motion and Ideal Radius Geometry
A historical lens-grinding bell-crank animation beside a separate ideal tilted-axis calculator for radius, curvature and local angle sensitivity.
Lathe Back-Gear Engagement: Eccentric Shaft, Direct Pin and Speed Calculator
See how a cone-pulley lathe engages its eccentric back gear, and compare an ideal spindle-speed series with a user-entered reduction.
Lapidary or Lithological Lathe Mechanism: How It Works, Parts, Surface Speed Formula & Diagram
Lapidary or lithological lathe explained — how the spindle, mud-feed and abrasive system shape stone, with worked numbers and examples from gem and stone shops.
Knitting Cam Mechanism: Straight-Flank Speed Calculator | FIRGELLI
Calculate needle speed on a straight cam flank from relative horizontal speed and angle. Explore an illustrative track with explicit transition and contact limits.
Knitting Machine: Latch-Needle Cycle and Timing Calculator | FIRGELLI
Explore latch-needle stitch stages and convert entered course rate and stroke to cycle time and average needle travel speed.
Hopper and Bell: Furnace Charging and Event-Count Example | FIRGELLI
Learn how a lowering bell releases a furnace charge. Explore a separate mass-per-tap calculator using entered event frequency and mass, with explicit limits.
Harvester and Mower Field-Capacity Calculator | FIRGELLI
Compare area-rate scenarios from cutting width, speed and field efficiency. Learn the cutting and crop-handling functions without assuming machine-specific operating settings.
Harrington CB Hoist: Catalog Pull and Chain Travel | FIRGELLI
Look up listed CB model ratings and calculate hand-chain travel from overhaul ratio and desired hook lift. This tool does not select a hoist or...
Hanging Shaft: Overhead Belt Drive and Shaft-Span Calculator
Explore overhead line-shaft bearings and belt take-offs. Compare a chosen span reference and the first bending frequency of an ideal bare steel shaft.
Portable Drill Power Train: Declared Ratio, Torque and Speed
How a Portable Drill works — chuck, motor, gearbox, torque clutch. Real RPM, feed, and torque numbers from construction, MRO, and fabrication shops.
Tumbling Grinding Mill: Critical Speed Calculator | FIRGELLI
Estimate tumbling-mill critical rpm from internal diameter and compare a chosen percentage range. Includes assumptions, a worked example and schematic charge motion.