The term ‘needle down time (NDT)’ is often used in apparel industry to express total time or percentage of total work time of a machine runs in sewing garment. This is actually needle running time.
The word ‘down time’ (or 'downtime') sometimes makes confusion and many may mean it as machine idle time and is considered as one of kind of non-productive time.
Traditionally 'downtime' word is associated with 'anything not working'. However in case of sewing machine it is just opposite 'sewing machine works when needle is down'. It will be better for everyone to use the word 'needle running time' to avoid confusion.
It is also explained the “Needle down time” as ‘Needle up & down going time’.
Needle down time is considered as one of the performance measures (KPI) for sewing floor as well as sewing factory performance.
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