Norm

ASTM F1503-02(2012)

Standard Practice for Machine/Process Capability Study Procedure

48,24

Over deze norm

Status Definitief
Aantal pagina's 4
Commissie F16.93
Gepubliceerd op 01-10-2012
Taal Engels

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:

Equation F1503-02R12_1


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 ??^ ???sigma hat???).

Using the existing sample size calculate:

??^ = 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

d2

1.13

1.69

2.06

2.33

2.53

2.70

2.85

2.97

3.08


Details

ICS-code 25.020
Nederlandse titel Standard Practice for Machine/Process Capability Study Procedure
Engelse titel Standard Practice for Machine/Process Capability Study Procedure

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