How to Calculate SAM of a Garment?

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SAM,  Standard Allowed Minute is used to measure task or work content of a garment. This term is widely used by industrial engineers and production people in the garment manufacturing industry. In this article, you will learn how to calculate standard minute (SAM) of individual sewing operations.

For the estimation of the cost of making a garment, SAM value plays a very important role. In past scientists and apparel technicians did research on how much time to be allowed to do a job when one follows standard method during doing the job. According to the research study minute value has been defined for each movement needed to accomplish a job. Synthetic data is available for each movement.
Calculation of garment SAM

General Sewing Data (GSD) has defined a set of codes for motion data for SAM calculation. There is also other methods through which one can calculate SAM of a garment without using synthetic data or GSD.
In this article, both methods are explained in the following.


Method #1: Calculation of SAM Using Synthetic Data

In this method 'Predetermined Time Standard' (PTS) code are used to establish 'Standard Time' of a garment or other sewing products. 


Step 1: Select one operation for which you want to calculate SAM.

Step 2: Study the motions of that operation. Stand by side of an operator (experienced one) and see the operator how he is doing it.

Note all movements used by the operator in doing one complete cycle of work. See carefully again and recheck your note if all movement/motion are captured and correct. (for example, motions are like - pick up parts one hand or two hands, align part on table or machine foot, realign plies, etc.)

Step 3: List down all motion sequentially. Refer the synthetic data for TMU (Time measuring unit) values. For synthetic data, you can refer GSD (without license use of GSD code prohibited but for personal use and study one can refer GSD code and TMU values) or Sewing Performance Data table (SPD).

Now you got TMU value for one operation (for example say it is 400 TMU). Convert total TMU into minutes (1 TMU=0.0006 minute). This is called as Basic Time in minutes. In this example, it is 0.24 minutes.

Step 4: Calculate SAM by adding bundle allowance and personal allowance to the basic time.

Standard allowed minutes (SAM) = (Basic minute + Bundle allowances + machine and personal allowances). 
Add bundle allowances (10%) and machine and personal allowances (20%) to basic time. 
Now you got Standard Minute value (SMV) or SAM. 
SAM= (0.24+0.024+0.048) = 0.31 minutes.

I like to refer you an article Secret Behind Calculation of Machine Time in SAM for better understand of SAM calculation. 


Method #2: Calculation of SAM Through Time Study


Step 1: Select one operation for which you want to calculate SAM.

Step 2: Take one stopwatch. Stand by side of the operator. Capture cycle time for that operation. (cycle time – total time is taken to do all works needed to complete one operation, i.e. time from pick up part of the first piece to next pick up of the next piece).

Conduct time study for consecutive five cycles. Discard data if you found abnormal time in any cycle.

Calculate the average time of the 5 cycles. the time you got from time study is called cycle time. To convert this cycle time into the basic time you have to multiply cycle time with operator performance rating.
Basic Time = Cycle Time X performance Rating

Step 3: Performance rating. Now you have to rate the operator at what performance level he was doing the job seeing his movement and work speed. Suppose that operator performance rating is 80%. Suppose cycle time is 0.60 minutes. Basic time = (0.60 X 80%) = 0.48 minutes

Step 4: Calculate SAM using the following formula

Standard allowed minutes (SAM) = (Basic minute + Bundle allowances + machine and personal allowances). 

Add bundle allowances (10%) and machine and personal allowances (20%) to basic time. Now you got Standard Minute value (SMV) or SAM. SAM= (0.48+0.048+0.096) = 0.624 minutes.

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Online Clothing Study: How to Calculate SAM of a Garment?
How to Calculate SAM of a Garment?
Standard minute calculation procedure is explained in this post with example. Two methods are shown to estimate the garment SAM.
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