Calculation of SAM/SMV: |
Step 1: Select one operation for which you want to calculate SAM.
Step 2: Capture cycle time for that operation by stop watch standing beside of the operator. (cycle time: total time taken to do all works needed to complete one operation). Do time study for consecutive five cycles. Calculate average of the 5 cycles. Time we get from time study is called cycle time.
Basic Time = Cycle Time X Performance rating
* Performance rating: Performance rating means at what performance level operator doing the job, considering 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 3: 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 we get Standard Minute value (SMV) or SAM. SAM= (0.48+0.048+0.096) = 0.624 minutes.
OPERATION
BREAKDOWN AND SMV
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Name
of Operation
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M/C
name
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SMV
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Manpower
|
Placket Iron
|
IRON
|
0.40
|
2
|
Placket Join Position Mark
|
TABLE
|
0.30
|
1
|
Placket Join
|
1N2TLS
|
0.32
|
2
|
Placket Front Middle Cut
|
TABLE
|
0.28
|
1
|
Rib Placket Servicing
|
O/L
|
0.25
|
1
|
Lower Placket 2 Part Join
|
1N2TLS
|
0.30
|
1
|
Lower Placket O/L
|
2N4TOL
|
0.28
|
1
|
Lower Placket Join & Top Stitch
|
1N2TLS
|
0.32
|
2
|
Nose Tack
|
1N2TLS
|
0.35
|
1
|
Back & Front Part Matching
|
TABLE
|
0.30
|
1
|
Shoulder Joint & Trim
|
2N4TOL
|
0.33
|
1
|
Collar Servicing & Mark
|
O/L
|
0.30
|
1
|
Collar Tack to Neck
|
1N2TLS
|
0.40
|
2
|
Collar Join
|
2N4TOL
|
0.32
|
1
|
Collar Piping
|
1N2TFL
|
0.30
|
1
|
Collar Top Stitch
|
1N2TLS
|
0.60
|
2
|
Placket Close & 1/16 T/S
|
1N2TLS
|
0.71
|
3
|
Placket Inner Tack
|
1N2TLS
|
0.35
|
1
|
Placket Corner Cut
|
TABLE
|
0.25
|
1
|
Placket Box Make
|
1N2TLS
|
0.50
|
2
|
Cuff Servicing
|
O/L
|
0.25
|
1
|
Cuff Join
|
2N4TOL
|
0.40
|
1
|
Sleeve Matching
|
TABLE
|
0.30
|
1
|
Sleeve Join
|
2N4TOL
|
0.43
|
2
|
Arm Hole Top Stitch
|
2N3TFL
|
0.45
|
1
|
Cuff Opening Tack
|
1N2TLS
|
0.30
|
1
|
Sticker Remove+ Body Turn
|
TABLE
|
0.20
|
1
|
Side Seam
|
2N4TOL
|
0.50
|
2
|
Cuff Top Tack
|
1N2TLS
|
0.22
|
1
|
Bottom Hem
|
2N3TFL
|
0.24
|
1
|
Button Hole
|
1N2TBH
|
0.25
|
1
|
Button attach With Mark
|
1N2TBA
|
0.40
|
1
|
Label Make & Bottom Security Tack
|
1N2TLS
|
0.43
|
2
|
Total
|
11.53
|
44
|
Sewing Thread Consumption:
Sewing thread requirement 3.44 M for machine code 1N2TLS means to Stitch 1 Meter of Seam, 3.44 meter sewing thread is used.Here we need to consider operational allowance 3+3=6 cm (starting point+ ending point) for each operation for Lock Stitch and 3.5+3.5= 7 cm for chain stitch , 5+5=10 cm for Flat lock , 6+6=12 cm for over lock with the length of each operation.
Also we need to consider 10-15% wastage on the calculated sewing thread consumption.
SEWING THREAD CONSUMPTION
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M/C Name
|
CODE
|
Required Thread(M/M)
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Single Needle Lock Stitch
|
1N2TLS
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3.44
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Single Needle 2 Thread Flat Lock
|
1N2TFL
|
4.8
|
Double Needle 3 Thread Flat Lock
|
2N3TFL
|
13.2
|
Double Needle 4 Thread Over lock
|
2N4TOL
|
19.8
|
Without Needle Over lock M/C
|
O/L
|
0
|
Button Attach
|
1N2TBA
|
0.3
|
Button Hole
|
1N2TBH
|
0.95
|