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Needle looms are sold on picks per minute but paid for in metres of tape. The pick density between them decides which number matters.
— m/shift
All tapes together at the stated efficiency
Needle looms lose more time to warp change and pattern set-up than to stops, so take the efficiency figure from a full order cycle rather than from a steady run.
Needle Loom Production Calculator (Tapes & Webbing) — free, with the formula and a worked example, at Textile School.