ASTM F1503-02

Practice for Machine/Process Capability Study Procedure

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.

General Information

• Status: Historical
• Publication Date: 09-Oct-2002
• ICS: 25.020 - Manufacturing forming processes
• Technical Committee: F16 - Fasteners
• Drafting Committee: F16.93 - Quality Assurance Provisions for Fasteners

Relations

• Replaces: ASTM F1503-95 - Standard Practice for Machine/Process Potential Study Procedure
• Effective Date: 10-Oct-2002
• Replaced By: ASTM F1503-02(2007) - Standard Practice for Machine/Process Capability Study Procedure
• Effective Date: 01-Jul-2007

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:F 1503–02
Standard Practice for
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Machine/Process Capability Study Procedure
This standard is issued under the fixed designation F 1503; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope* 4. Summary of Practice
1.1 This practice covers provision of a proper method for 4.1 Amachine/process capability (MPC) study is conducted
determining process capability for new or existing machine to provide a level of confidence in the ability of a machine/
processes. It is recommended that available statistical software process to meet engineering specification requirements. This is
be used for the calculation of the descriptive statistics required accomplished through statistical process control techniques as
for decision making when using this practice. Where software defined in this practice.
is not available, Section 8 and Tables 1 and 2 are provided for 4.2 For new equipment purchases, the purchaser’s manufac-
manual calculations. turing engineering department, or equivalent discipline, shall
have primary responsibility for ensuring that the requirements
2. Referenced Documents
of this practice are met. The purchaser’s quality assurance
2.1 ASTM Standards:
department shall be available to assist on an as-requested basis.
F 1469 Guide for Conducting a Repeatability and Repro- 4.3 New machines/processes will not be accepted for use in
ducibility Study on Test Equipment for Nondestructive
production with C values less than 1.67. If a manufacturing
p
2
Testing process must be conditionally accepted, a process
improvement/product control plan shall be developed.
3. Terminology
4.3.1 The machine/process control plan shall identify spe-
3.1 Definitions of Terms Specific to This Standard:
cific process improvement activities, which will be imple-
3.1.1 bilateral specifications—specifications that have both
mented to make the process more capable as well as an interim
upper and lower values.
inspection plan to ensure that nonconforming product is not
3.1.2 C —an index that indicates the variability of the
shipped to a customer.
p
process with respect to tolerance.
4.4 Product Specifications:
3.1.3 C k—an index of process variability and centering.
4.4.1 Prior to any MPC study, the product specifications
p
This is a widely-used index which considers the process mean,
(nominal dimension and tolerances) must be identified, and an
range, and its relation to the specification nominal.
appropriate method of variables type inspection selected.
3.1.4 inspection plan—a set of instructions defining product
4.4.2 This practice is limited to bilateral specifications
characteristics, specifications, frequency of inspection, accep-
whose distributions can be expected to approximate a normal
tance criteria, and methods of inspection for product at a
curve. This practice should not be applied to unilateral speci-
specified operation.
fications (flatness, concentricity, minimum tensile, maximum
3.1.5 process parameters—combination of people, equip-
hardness, etc.).
ment, materials, methods, and environment that produce out-
4.5 Gage Capability Analysis:
put.
4.5.1 All gaging systems used to evaluate product involved
3.1.6 unilateral specifications—specifications that have
in the study must have documentation for a gage repeatability
only upper or lower values.
and reproducibility study in accordance with Guide F 1469
3.1.7 s—an estimate of the standard deviation of a process
before the machine/capability study is conducted.
characteristic.
4.5.1.1 Gaging systems which consume #10 % of the
applicable product tolerance are considered acceptable.
4.5.1.2 Gaging systems which consume over 10 to 30 % of
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the applicable product tolerance are generally considered to be
This practice is under the jurisdiction of ASTM Committee F16 on Fasteners
and is the direct responsibility of Subcommittee F16.93 on Quality Assurance
unacceptable. However, users of this guide may authorize their
Provisions for Fasteners.
use depending on factors such as the criticality of the specifi-
Current edition approved Oct. 10, 2002. Published December 2002. Originally
cation in question, the cost of alternative gaging systems, and
approved in 1994. Last previous edition approved in 1995 as F 1503 – 95.
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Annual Book of ASTM Standards, Vol 01.08. so forth.
*A Summary of Changes section appears at the end of this standard.
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F 1503–02
4.5.1.3 Gaging systems which consume more than 30 % of 7. Pro
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