Recent Blogs
Four-Motion Sewing Feed: Average Speed Calculator | FIRGELLI
See rise, advance, fall and return, and compare ideal average fabric feed from stitch length and three rates. Machine limits and timing are separate.
Sewing-machine Mechanism Explained: Lockstitch Parts, Hook Timing Diagram and Speed Formula
How a sewing machine forms a lockstitch — needle bar timing, rotary hook geometry, feed dog action, and the numbers that decide whether a garment...
Sewing-machine Shuttle Mechanism: How Rotary and Oscillating Hooks Form a Lockstitch
How a Sewing-machine Shuttle forms a lockstitch, with timing tolerances, real-world examples from apparel and leather goods factories, and a worked calculation.
Sewing Machine Rotary Hook Mechanism Explained: How It Works, Parts, Timing & Lockstitch Formation
Explore rotary-hook lockstitch formation and calculate tip speed from hook diameter and stitch rate. Learn why timing, clearance and lubrication settings are model-specific.