Pitch time: In
industrial Engineering, Pitch time is a ratio of total SAM of garment and
number of operations to be set for the style. Or
Pitch
Time = Garment SAM/No. of operations.
Pitch time is used for line setting and calculating
production target for the line.
Pitch diagram:
A graphical presentation of individual operation’s time (SAM) and pitch time on a same chart is called pitch diagram. For example see the following chart (Fig.1). At this chart on Xaxis operations name and on Yaxis time value is depicted. The blue line is showing individual operation SAM and red line is showing pitch time.Usage of Pitch Diagram:
Pitch time is to calculating machine requirement in each
operation.
Pitch diagram is used for line balancing in an assembly
line. Pitch diagram is made on operator’s production capacity per hour and
target quantity per hour in pieces for easy understanding.
How to make a Pitch
Diagram
To make a pitch diagram on operator’s capacity Vs line
target collect information as following. First conduct a capacity study for all operators and find out how
many pieces operators are making at each operation. Where more than one
operator is doing same operation, sum up their capacity for that particular
operation. With the capacity study data make one table on spreadsheet as
following table1.
For example, the line is making ladies blouse. Operations
are listed in column B as per operation sequence (all operations are not taken).
In column C number of pieces is listed according to the operations that can be produced
by the operators. Add one more column ‘D’ and write target quantity (in the
example 27) against each operation.
Suppose that hourly production target is 27 pieces for the line.
So to meet the target at the end of the line you should get minimum 27 pieces
per hour from each operation and for the preparatory operations capacity should
be more than 27 pieces. Now draw a line chart with capacity and line target
(Fig. 2). This chart is also called as “Pitch Diagram”. The blue line is
showing actual capacity at each operation and Red line is presenting the target
quantity.
A

B

C

D

Sl. No.

Operations

Capacity/Hour
(Pieces)

Target/hr
(Pieces)

1

Collar run stitch

35

27

2

Back dart making

27

27

3

Sleeve slit binder

29

27

4

Front placket attach

21

27

5

Front placket finish

20

27

6

Front dart making

33

27

7

Shoulder Join O/L

30

27

8

Shoulder edge stitch

40

27

9

Sleeve attach O/L

50

27

10

Side attach

20

27

11

Cuff attach

17

27

12

Cuff finish & Tacking

16

27

13

Collar attach

24

27

14

Collar finish

24

27

15

Bottom Hem

27

27

Fig. 2: Pitch Diagram (Actual capacity Vs Target quantity)
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