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ASTM International - ASTM F1503-02(2012)

Standard Practice for Machine/Process Capability Study Procedure (Withdrawn 2018)

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Organization: ASTM International
Publication Date: 1 October 2012
Status: inactive
Page Count: 4
ICS Code (Manufacturing forming processes): 25.020
significance And Use:

5.1 This practice is designed to evaluate a machine or process isolated from its normal operating environment. In its normal operating environment, there would be many sources of variation that... View More

scope:

1.1 This practice covers provision of a proper method for determining process capability for new or existing machine processes. It is recommended that available statistical software be used for the calculation of the descriptive statistics required for decision making when using this practice. Where software is not available, Section 8 and Tables 1 and 2 are provided for manual calculations.

TABLE 1 Machine/Process Average and Range

Calculate the average Range (

R) and the Process Average X For the study period, calculate:

 

where:

k

  =  the number of subgroups,

R1

  =  the range and average of the first subgroup,

X1

  =  the range and average of the first subgroup,

R2

  =   from the second subgroup, and

X2

  =   from the second subgroup, etc.

TABLE 2 Machine/Process Standard Deviation

 
Estimate the process standard deviation (the estimate is shown as σ^ "sigma hat").
Using the existing sample size calculate:
σ^ =

R/d2

Where

R is the average of the subgroup ranges (for periods with the ranges in control) and d 2 is a constant varying by sample size, as shown in the table below:

n 2 3 4 5 6 7 8 9 10
d

2

1.13 1.69 2.06 2.33 2.53 2.70 2.85 2.97 3.08

Document History

ASTM F1503-02(2012)
October 1, 2012
Standard Practice for Machine/Process Capability Study Procedure (Withdrawn 2018)
1.1 This practice covers provision of a proper method for determining process capability for new or existing machine processes. It is recommended that available statistical software be used for the...
July 1, 2007
Standard Practice for Machine/Process Capability Study Procedure
This practice is designed to evaluate a machine or process isolated from its normal operating environment. In its normal operating environment, there would be many sources of variation that may not...
October 10, 2002
Practice for Machine/Process Capability Study Procedure
1.1 This practice covers provision of a proper method for determining process capability for new or existing machine processes. It is recommended that available statistical software be used for the...
January 1, 1995
Standard Practice for Machine/Process Potential Study Procedure
1.1 This practice covers the proper method for establishing process potentials for new or existing processes.
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