Recent Blogs
Lever and Ratchet: Ideal Force Ratio and One-Tooth Indexing
An ideal lever-force comparison with an animated ratchet cycle that separates drive, holding and reset phases without implying a product capacity.
Bent-spring Driver with Strong-spring Catch: How the Mechanism Works, Parts, Formula, and Uses
Explore a bent spring on a rotating carrier engaging an intermittent ratchet through a fixed catch. Compare spring rates, preload and catch seating force.
Intermittent Motion: Geneva Index and Dwell Calculator | FIRGELLI
Compare ideal Geneva step and index/dwell fractions, including an overlap warning for equally spaced pins. Physical multi-pin compatibility is not established.
Quadrant Catch Hand-Gear Form A: Declared Arc-Index Ledger
Quadrant Catch Hand-gear Form A explained — how the toothed quadrant lever locks naval gun elevation, with diagrams, formulas and restoration examples.
Windlass Grip Pawl: Signed Force and Moment Comparison
Compare chain pull and signed pawl-offset moment. The negative-offset indicator describes the entered sign; it does not prove release or self-locking.
Intermittent Reciprocating Motion: Dwell Time Calculator | FIRGELLI
Convert a total dwell angle and constant input rpm into cycle, dwell and non-dwell time. Rack travel and gear engagement are illustrative.
Intermittent Rotary Motion: Geneva and Carousel Pitch Calculator | FIRGELLI
Compare external-Geneva output step, driver engagement and dwell with carousel station pitch. The calculator identifies a direct pitch match, not a complete mechanism design.
Windlass Mechanism Explained: How It Works, Parts, Formula, Diagram, and Calculator
Explore the ideal force balance between a windlass crank and drum. Adjust fixed radii and load mass; the results do not establish a lifting capacity.