Machine Performance
Stops per hour measures the machine. Stops per hundred thousand picks measures the yarn.
— stops/100k picks
Speed-normalised stop rate
Warp and weft CMPX should be read separately and rarely have the same cause — warp stops point at sizing, drawing-in and shed geometry, weft stops at package build, insertion setting and the weft accumulator. Picks are computed from nameplate speed and efficiency rather than counted, so a loom whose actual speed differs from its setting will misreport; take the pick counter reading where one exists. The efficiency lost figure counts stop duration only and omits the ramp back to speed, which on a high-speed air-jet is a material addition to every stop.
Loom Stops per Hundred Thousand Picks (CMPX) Standardizer — free, with the formula and a worked example, at Textile School.