Recent Blogs
Cylinder-on-cylinder Lower Pair Mechanism: How It Works, Diagram, Parts and Uses Explained
Explore independent sliding and rotation in a cylindrical joint. Compare bore and shaft diameters to calculate signed radial and diametral clearance.
Link Transmission Mechanism: How Four-Bar Linkages Work, Parts, Transmission Angle and Uses
Explore transmission angle at a coupler-to-rocker joint. Calculate normalized tangential and radial force components and compare the angle with a chosen band.
Three-link Kinematic Chain: Generic Planar Mobility
Compare open and closed ideal three-link chains, counting ground as one link. Calculate nominal mobility and joint constraints without solving dimensions or motion.
Six-bar Linkage Mechanism Explained: How It Works, Parts, Diagram and Uses
Explore a moving Watt-type six-bar linkage with seven pin joints and use the planar mobility calculator to compare link and joint counts.
Crank and Slotted Lever: Sweep-Time Calculator | FIRGELLI
Calculate slotted-lever sweep angles, unequal timing intervals and cycle time from crank radius, center distance and speed. The attached ram has separate turning points.
Closed Four-Link Chain: Planar Mobility Calculator | FIRGELLI
Explore planar link and joint counts, the Gruebler–Kutzbach equation and a four-bar illustration. Understand connectivity and constraint assumptions.
Eight-bar Linkage Mechanism Explained: How It Works, Parts, Diagram and Grübler DOF Formula
Explore a Jansen-type eight-bar walking leg with a calculated foot path. Adjust scale, crank radius and speed; see rigid links, joint count, travel and gait...
Crossed-slider Chain Mechanism Explained: How It Works, Parts, Formula, and Uses
Explore an elliptic trammel with a tracing point between two slider pins. Calculate ellipse width, height, area and pin spacing, and compare slider travel.
Planar Mechanism Mobility: Constraint-Count Worksheet
Calculate the generic planar mobility count from links and joints, and explore a four-bar example. Constraint independence and actual geometry require separate checks.
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.