Recent Blogs
Right-and-left Hand Screw Nut Traverse Mechanism: How It Works, Parts, Diagram, and Uses
How a Right-and-left Hand Screw Nut Traverse drives bidirectional spooling on wire winders, textile bobbins, and lab stages — formula, worked example, and design tradeoffs.
Reverse-thread Cylinder Reciprocator Mechanism: How It Works, Diagram, Parts and Uses
See how opposite-hand grooves produce back-and-forth travel from continuous rotation. Calculate ideal axial speed and travel time from pitch, rpm and stroke.
Rectilinear Motion of Slide by Screw: How It Works, Diagram, Parts and Calculator Explained
Calculate ideal screw-driven slide speed, feed and travel from lead, RPM and turn count. Compare axial backlash with one screw lead.
Spiral Push Drill: Lead and Stroke Geometry
How a Persian drill converts push force into reciprocating rotation through a quick-thread spindle. Used in jewellery, watchmaking, and dental tool design.
Movable Lathe Head: Handwheel, Screw, and Center-Spindle Travel
Explore the handwheel-driven center spindle of a movable lathe head. Calculate ideal screw travel and final extension from lead, turns and starting extension.
Differential Micrometer Screw: Same-Hand Lead-Difference
Explore a same-hand differential micrometer screw and calculate shaft motion, nut motion and net output from the two thread leads and signed turns.
Reversing Grooved Drum: Helix Lead Calculator | FIRGELLI
Calculate axial advance from groove diameter and lead angle. Explore constant-lead geometry, slope and the distinction between helix advance and a complete reversing stroke.
Grooved Barrel Cam: Reciprocating Timing Calculator | FIRGELLI
Convert rise, dwell and return angles into milliseconds at a selected cam rpm. Check the 360-degree angle sum and explore a schematic barrel-cam cycle.
Wood Screw: Pitch, Advance and Ideal Work Calculator | FIRGELLI
Explore wood-screw geometry and ideal axial advance. Compare pitch, core diameter, work per turn and a frictionless force bound, separate from joint capacity.
Common Screw Bolt and Nut: Thread Pitch, Axial Travel and Helix Angle
Explore single-start bolt-and-nut motion. Calculate free axial travel from pitch and turns, and compare circumference and helix angle at the entered diameter.
Archimedes' Screw Mechanism: How It Works, Parts, Formula, Diagram and Calculator
See water pockets travel through an inclined screw. Compare annular sector volume, lead, starts and estimated displacement using a fixed illustrative fill factor.
Differential Screw (compound Pitch) Mechanism: How It Works, Diagram, Formula & Uses Explained
Explore two same-hand screw leads acting through fixed and guided nuts. Calculate signed output travel and ideal motion per degree from their lead difference.
Weiss CV Joint Mechanism Explained: How It Works, Parts, Geometry, and Uses on Steered Drive Axles
Explore the ideal constant-velocity principle and angle-bisecting ball plane. Compare its speed ratio with a separate single-Hooke-joint calculation.
Union Coupling: Bore-area and Wrench-force Comparison
Explore a threaded pipe union. Calculate circular bore area, a pressure-area reference and ideal wrench force; the tool does not specify sealing, preload or installation...
Tripod CV Joint: Plunge Motion and Ideal Force Comparison
Explore a tripod joint and calculate torque-to-radius force, an assumed equal roller share and a plunge-to-travel ratio. Actual contact loads and joint limits are not...
Thompson Coupling: Ideal Constant-velocity Comparison
Compare ideal 1:1 Thompson coupling motion with the maximum and minimum speed ratios of a single Hooke joint. Real product accuracy and operating limits are...
Rzeppa CV Joint: Six-Ball Mechanism, Animation and Geometry Calculator
Explore a six-ball Rzeppa CV joint. Vary articulation and ball-centre radius to compare cage tilt and axial ball travel while ideal shaft speeds remain equal.
Magnetic Coupling: Containment Shell and Power–Torque Calculator
Explore a radial magnetic coupling with a stationary containment shell. Convert entered mechanical power and rotational speed into torque for an ideal synchronous state.
Linked Hinges Mechanism: How Coupled Hinges Work, Diagram, Parts, Formula and Uses Explained
Explore two hinge arms joined by a rigid coupling rod. Calculate follower angle and geometric closure, with an explicit gap for unreachable combinations.
Hirth Joint: Facing Serrations and Ideal Force Calculator | FIRGELLI
Explore Hirth face serrations and an ideal wedge-force comparison using torque, radius, model angle and clamp force. The calculator does not rate a joint or...
Double Spherical Socket Mechanism: How It Works, Diagram, Parts, Uses & Formula Explained
Explore a concentric spherical instrument mounting. Adjust bearing radii, stem size and tilt to check the illustrated aperture and base clearances.
Double Hooke Joint (constant Velocity) Mechanism: How It Works, Diagram, Parts, Uses & Calculator
Explore two Hooke joints in series. Adjust bend angles and yoke phasing to compare intermediate and output speeds and find ideal speed cancellation.
Curvic Coupling Mechanism: How Self-Centering Face Teeth Work, Parts, Formula and Uses
Explore curved annular coupling teeth, ideal two-flank preload forces and local flank movement. Learn why summed force magnitudes are not a net centering force.
Bayonet Joint Mechanism: How It Works, Parts, L-Slot Geometry, and Uses Explained
Bayonet joint mechanism explained — twist-and-lock coupling design, pin and slot geometry, and real applications in lighting, optics, and military fittings.
Anti-friction Roller Bearing: Animation, Parts and Friction Comparison
Explore a cylindrical roller-bearing cutaway and compare assumed friction coefficients. Learn what the ratio and relative-loss outputs mean and what they cannot predict.