# 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

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%