# How to Calculate Sewing Time By Using Machine RPM?

**How to Calculate Sewing Time By Using Machine RPM?**

Sewing time calculation is an important matter in the **readymade garments sector**. It’s not a tough task that we have normally seemed. As its importance in **garments manufacturing**, today I will present here an easy method for calculating sewing time by using machine RPM (Revolution per minute).

**Method of Sewing Time Calculation by Using Machine RPM:**

Before calculating garments **sewing** times by using machine RPM (Revolution per minute), 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 times from machine RPM (revolution per minute).

**Machine cycle time or sewing times (in second),
**

Now, I will present here an example to clear all the confusion from the above discussions.

**Example:**

Suppose, for a lock stitch sewing machine, machine RPM is 1500. How much time needed to sew a 40” superimposed seam, where stitch per inch (SPI) is 10?

**Solution:**

Here,

Sewing machine RPM= 1500,

Seam length in inch= 40”,

Stitch per inch (SPI) = 10.

Now,

**Machine cycle times or sewing times (in second),**

= 16sec.

**So, machine cycle times or sewing times is 16sec.**

* Note: *During 16sec sewing time, no machine stopping occurred and this time is calculated by ignoring all the other factors.

* Speech from the writer:*If you read this article with full concentration then you can easily answer the below questions in the interview:

- How to estimate sewing times by machine RPM?
- How to determine the sewing machine times by using machine RPM?
- Mention an easy method for calculating sewing machine times from machine RPM?
- Show a sewing time calculation method by using sewing machine RPM followed in
**industrial engineering**.

**Written By-**

**Mayedul Islam**

Merchandiser at Fashion Xpress Buying House.

Badda, Dhaka, Bangladesh.

Email: mayedul.islam66@gmail.com

Mayedul Islam is a Founder and Editor of Garments Merchandising. He is an Expert in Garments Merchandising. Writing is his passion. He loves to write articles about Apparel, Textile and Garment Washing specially on Merchandising. Mail him at mayedul.islam66@gmail.com

I would like to give a special thanks

Sorry, this is not the formula, as per gsd MST is

MST = Stitches per cm (SPC or ST/CM)

RPM x 0.0006 minutes

The Minimum Sewing Time (MST), that is the fastest possible time to sew one centimeter on that machine, at that speed and stitch density.

Revolution per minute of a Sewing machine = How many stitch that machine can do per minute

Am I correct on above ?

Very nice

Hi

How do i get SAM FROM A GARMENT SEAM MEASUREMENTS IF I DONT USE THE CYCLE TIME FROM STOP WATCH

pls explain about NDT and NDT%