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Estimation of Sewing Time using Machine RPM

By using the below formula, an industrial engineer can easily calculate the

required garments sewing time from machine RPM.


Machine cycle time = Stitch per inch (SPI) x Seam length in inch x 60

or sewing time (in second), ..........................................................................................

Sewing Machine RPM




If we see an example then concept will be clear,

If a plain stitch sewing machine RPM is 1400. How much time needed to sew a 50 inch length seam, where stitch per inch (SPI) is 8?


Solution:

Sewing machine RPM= 1400, Seam length in inch= 50”, Stitch per inch (SPI) = 8

we know that,

Machine cycle time = Stitch per inch (SPI) x Seam length in inch x 60

or sewing time (in second) ..........................................................................................

Sewing Machine RPM

= 8 x 50 x 60

…………………

1400

= 24000

…………

1400


Sewing time of that machine = 17.14 sec

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