ASTM F1888-02
(Test Method)Test Method for Compression-Displacement of Baseballs and Softballs
Test Method for Compression-Displacement of Baseballs and Softballs
SIGNIFICANCE AND USE
The static compression-displacement of a baseball or softball is a mechanical property which can correlate to dynamic properties.
This test method is suitable for obtaining data in research and development, quality control, and classifying balls by the compression-displacement.
Sports associations can use compression-displacement standards in specifications for official baseballs and softballs standards in specifications for official baseballs and softballs for purposes of consistency of performance.
This same test procedure can be utilized with other compressive forces and the specified force is not necessarily the same as experienced in actual use.
SCOPE
1.1 This test method describes a comparative measurement method for baseballs and softballs as defined by a static compression displacement test.
1.2 This test method is based on a slow rate force-displacement measurement.
1.3 This procedure is for baseballs and softballs meeting standards established by the sports' governing bodies.
Note 1—Since the compression-displacement of baseballs and softballs can influence the performance characteristics, this test provides a simple method to compare and categorize such balls based on force levels in a standardized compression-displacement test.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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An American National Standard
Designation:F1888–02
Test Method for
1
Compression-Displacement of Baseballs and Softballs
This standard is issued under the fixed designation F 1888; 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. Significance and Use
1.1 This test method describes a comparative measurement 4.1 The static compression-displacement of a baseball or
method for baseballs and softballs as defined by a static softball is a mechanical property which can correlate to
compression displacement test. dynamic properties.
1.2 This test method is based on a slow rate force- 4.2 This test method is suitable for obtaining data in
displacement measurement. research and development, quality control, and classifying
1.3 This procedure is for baseballs and softballs meeting balls by the compression-displacement.
standards established by the sports’ governing bodies. 4.3 Sports associations can use compression-displacement
standards in specifications for official baseballs and softballs
NOTE 1—Since the compression-displacement of baseballs and soft-
standards in specifications for official baseballs and softballs
balls can influence the performance characteristics, this test provides a
for purposes of consistency of performance.
simple method to compare and categorize such balls based on force levels
4.4 This same test procedure can be utilized with other
in a standardized compression-displacement test.
compressive forces and the specified force is not necessarily
1.4 This standard does not purport to address all of the
the same as experienced in actual use.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Apparatus
priate safety and health practices and determine the applica-
5.1 Compression Device, to compress the test ball between
bility of regulatory limitations prior to use.
two flat plates to 6.35 mm (0.25 in.) displacement. Compres-
sive force to 3560 N (800 lb) is sufficient.Ameans of centering
2. Terminology
the test ball so that the vertical axis of the ball aligns with the
2.1 Definitions of Terms Specific to This Standard:
vertical axis of the compression device piston.
2.1.1 baseballs and softballs, n—any such ball defined by
5.2 Compression Force Gage, to measure the compressive
the rules of the game as published by the sports’ governing
load in newtons or pounds. Device must be able to measure at
bodies.
least 4448 N (1000 lb).
2.1.2 compression-displacement, n—the reduction in ball
5.3 Compression-Displacement Gage, to measure the dis-
diameter under a specified compressive load between two flat
placement at the prescribed level of 6.35 mm (0.25 in.).
plates. Synonymous with compression-deflection.
5.4 Motor, Drive, and Speed Control, to drive the compres-
2.1.3 force, n—the resistance to displacement. The interac-
sion device to 6.35 mm (0.25 in.) displacement in a time of 12
tion between test machine and ball during compression.
to 18 s at a constant rate.
3. Summary of Test Method
6. Conditioning
3.1 The baseball or softball is placed between two flat-plate
6.1 Ball Conditioning:
surfaces of a compression machine and then compressed to a
6.1.1 Store test balls at the test environmental conditions for
standard displacement of 6.35-mm (0.25-in.).The compression
...
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