Spindle Speed Optimisation
topic
Spindle speed is limited by: traveller speed limit (max 35–40 m/s surface speed before fly-off due to centrifugal heating), balloon tension limits (end breakage rate), and spindle vibration (critical speed). For cotton, typical operating speeds are 16,000–22,000 RPM for medium counts (20–40 Ne) and 12,000–16,000 RPM for coarser counts. Speed is optimised by balancing productivity (output ∝ speed) against end-breakage rate (cost ∝ speed²).
Role
Spindle speed optimisation is the core productivity engineering task in ring spinning. A 10% increase in spindle speed increases output by 10% but may increase end-breakages by 20%. Finding the economic optimum requires understanding the cost of breakages versus the value of production, and is the basis for ROI calculations on high-speed ring frame upgrades.