A JH, S. et al. [3]. The

A process in the manufacturing industry is very special because the process needs the linkage of manpower, raw materials, machines, and
methods. In order to improve the quality level of products, the capability of
the process plays an important role in the manufacturing
industry. Rezaie, K. 6. The process capability
indices (PCIs) is also known as process
capability analysis which is widely used in manufacturing industry. The
PCIs is used to measure the ability of the process to meet the requirements of
the customers which are also known as specification limits. The analyst used
PCIs to control and monitor the performance of the process in the manufacturing industry. Besides, the PCIs can use to improve the performance of the process by reducing the variation of the
process. JH, S. et al. 3.

The process capability analysis can be presented graphically by using
histogram and probability plot.
Montgomery, D. C. 5. The graphics can determine whether the process is
within specification limits (SLs) or not. Steiner, S. et al. 9. The
histogram is the easiest and clear method to determine the performance of the process. If the process is in
control and the data is normally distributed, the potential capability analysis
can be used to improve the quality of the process. Spano, A. 8. The PCIs is used to
compare the output of in control process with the SLs by 6 sigmas. PCIs are quantitative measures based on the performance and potential of the
process. By doing so, the process can meet the requirements of the customers.
Rezaie, K. et al. 6.

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The process of the manufacturing
industry is considered as capable when the process is under control. Spano, A.
6. The automotive industry was applying the PCIs in Japan and United States
(US). The process capability with sampling properties and estimation procedures
is measured to determine the normality of the process and the process is in
statistical control or not. Kane, V.E. 4. The PCIs had been used in
manufacturing industry in quantitative measure form to ensure the performance
of the process. The cost spent in the process of rework and scrap will cause
the loss of the industry. Hence, the high-quality
production should practice in industry and try to meet the requirements. JH, S.
et al. 3.

According to the requirements of the
customers with the costs that needed to spend
by the suppliers, the suppliers still need to set the suitable cost for their
product and ensure that the products are under tolerance limits. If the process capability of the process is under
control by the suppliers, we can try to
improve the quality of products or the process by out of control action plan
(OCAP). The process capability indices
can help to analyze the capability and
try to predict the machining process that can meet the expectations and
tolerance limits of the customers. The process capability indices consist of

,

,

 and

. Abhijit S. et al., Montgomery, D. C. 1, 5. The

 value
will represent the performance of process. Table 1 summaries the six quality
condition with its

 value.
?hsan K.2.

Table 1: Quality conditions and

 value

Quality condition

 value

Super excellent

2.00 ?

Excellent

1.67 ?

 ? 2.00

Satisfactory

1.33 ?

 ? 1.67

Capable

1.00 ?

 ? 1.33

Inadequate

0.67 ?

 ? 1.00

Poor