**Introduction:**

Calculation of sewing time is an important task for industrial engineers. Because it will be effective to get actual time to be taken by a sewing operator to sew a specific length of the seam. From this, we can get an operator production efficiency easily. If you read the article with concentration then I think you easily calculate sewing time. In this article, we discuss sewing time with machine RPM.

**Estimation of Sewing Time Using Machine RPM:**

Machine RPM means Revolution Per Minute of that machine. By machine RPM we can get time to sew a specific length of the seam with a specific Stitch per Inch (SPI). Before calculating garments sewing time by using machine RPM, an industrial engineer should confirm the below points:

- Stitch per inch (SPI) of the garments,
- Seam length in an inch of the garments,
- Sewing machine RPM (Revolution per minute).

Now by using the below formula, an industrial engineer can easily calculate the required garments sewing time.

Machine cycle time or sewing time (in second),

….Stitch per inch (SPI) x Seam length in inch x 60

= …………………………………………………………………….

………………………Sewing Machine RPM

**How to Find Out Sewing Time with Machine RPM**

If we see an example then the concept will be clear,

**Example:**

If a plain stitch sewing machine RPM is 1400. How much time needed to sew a 40-inch length seam, where stitch per inch (SPI) is 8?

Solution:

Here,

Sewing machine RPM= 1400,

Seam length in inch= 50”,

Stitch per inch (SPI) = 8.

We know that,

Machine cycle time or sewing time (in second),

….Stitch per inch (SPI) x Seam length in inch x 60

= ………………………………………………………………………

………………………….Sewing Machine RPM

…..8 x 50 x 60

= ………………….

……….1400

….24000

= ………….

…..1400

= 17.14 sec

So. The sewing time of that machine is 17.14 sec.

Authot of this Article:Noor Ahmed RaazB.Sc. in Textile Engineering (CU) Specialized in Apparel Manufacturing Merchandiser A.M.C.S Textile Ltd (AEPZ) Email: [email protected]