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ASTM F1890-05

(Test Method)

Standard Test Method for Measuring Softball Bat Performance Factor

Standard Test Method for Measuring Softball Bat Performance Factor

SIGNIFICANCE AND USE
This test method offers a laboratory means to compare the performance of a softball bat.
Use of this test method can provide sports governing bodies a means to compare calculated BBS and other physical properties of bats.
SCOPE
1.1 This test method covers a method for determining bat performance by measuring the bat-ball coefficient of restitution (BBCOR), deriving the bat performance factor (BPF) and calculating a batted ball speed (BBS). It is applicable to softball bats of any construction or material. The method provides a quantitative measure of bat dynamic performance that may be used for comparison purposes.
1.2 The BBCOR, BPF, and BBS are each calculated from measurements taken in the laboratory on test equipment meeting the requirements defined in this specification.
1.3 The values stated in inch-pound units are to be regarded as the standard.
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 requirements prior to use.

General Information

Status
Historical
Publication Date
30-Sep-2005
ICS
97.220.40 - Outdoor and water sports equipment
Technical Committee
F08 - Sports Equipment, Playing Surfaces, and Facilities
Drafting Committee
F08.26 - Baseball and Softball Equipment
Current Stage
Ref Project

Relations

Replaces
ASTM F1890-04 - Standard Test Method for Measuring Softball Bat Performance Factor
Effective Date
01-Oct-2005
Replaced By
ASTM F1890-09 - Standard Test Method for Measuring Softball Bat Performance Factor
Effective Date
01-Jun-2009
Referred By
ASTM F2398-11(2020) - Standard Test Method for Measuring Moment of Inertia and Center of Percussion of a Baseball or Softball Bat
Effective Date
01-Oct-2005

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ASTM F1890-05 - Standard Test Method for Measuring Softball Bat Performance Factor
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
An American National Standard
Designation:F1890–05
Standard Test Method for
1
Measuring Softball Bat Performance Factor
This standard is issued under the fixed designation F 1890; 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 3.1.3 bat performance factor (BPF), n—ratio of BBCOR to
ball COR as defined in this test method.
1.1 This test method covers a method for determining bat
3.1.4 center of percussion (COP), n—also known as the
performance by measuring the bat-ball coefficient of restitution
center of oscillation, the length of a simple pendulum with the
(BBCOR), deriving the bat performance factor (BPF) and
same period as a physical pendulum, as in a bat oscillating on
calculating a batted ball speed (BBS). It is applicable to
a pivot. Forces and impacts at this location will not induce
softball bats of any construction or material. The method
axial reactions at the pivot point.
provides a quantitative measure of bat dynamic performance
3.1.5 coeffıcient of restitution (COR), n—measure of impact
that may be used for comparison purposes.
efficiency calculated as the relative speed of the objects after
1.2 The BBCOR, BPF, and BBS are each calculated from
impact divided by the relative speed of the objects before
measurements taken in the laboratory on test equipment
impact.
meeting the requirements defined in this specification.
3.1.6 moment of inertia (MOI), n—measure of mass distri-
1.3 The values stated in inch-pound units are to be regarded
bution relative to an axis of rotation. It is the product of the
as the standard.
mass multiplied by the square of the distance to the mass,
1.4 This standard does not purport to address all of the
summed over the entire bat.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Significance and Use
priate safety and health practices and determine the applica-
4.1 This test method offers a laboratory means to compare
bility of regulatory requirements prior to use.
the performance of a softball bat.
2. Referenced Documents 4.2 Use of this test method can provide sports governing
2
bodies a means to compare calculated BBS and other physical
2.1 ASTM Standards:
properties of bats.
F 1887 Test Method for Measuring the Coefficient of Res-
titution (COR) of Baseballs and Softballs
5. Apparatus
F 1888 Test Method for Compression-Displacement of
5.1 Test Balls—Official softballs approved for play and
Baseballs and Softballs
tested in accordance with the following procedures. Perform
F 2398 Test Method for Measuring Moment of Inertia and
ball compression test of Test Method F 1888 prior to ball COR
Center of Percussion of a Baseball or Softball Bat
test of Test Method F 1887.
3. Terminology 5.1.1 Compression—350 to 375 lb at 0.25-in. deflection
(1557 to 1668 N at 6.4-mm deflection) in accordance withTest
3.1 Definitions of Terms Specific to This Standard:
Method F 1888. Balls to be labeled with compression value.
3.1.1 balance point, n—distance to the center of mass of a
5.1.2 Weight—6.25to6.75oz(177.2to191.4g).Ballstobe
bat when measured from the distal end of the bat knob.
labeled with weight value.
3.1.2 bat-ball coeffıcient of restitution (BBCOR), n—COR
5.1.3 Size—12.00 to 12.25-in. (304.8 to 311.1-mm) circum-
of a specific ball colliding with a bat as defined in this test
ference. Balls to be labeled with size value.
method. See coeffıcient of restitution (COR).
5.1.4 Core Material—Polyurethane.
5.1.5 Ball COR—0.450 to 0.470 in accordance with Test
1
This test method is under the jurisdiction of ASTM Committee F08 on Sports
Method F 1887. Balls to be labeled with COR and test speed in
Equipment and Facilities and is the direct responsibility of Subcommittee F08.26 on
ft/s.
Baseball and Softball Equipment.
5.2 Bat-Ball COR Test Apparatus:
Current edition approved Oct. 1, 2005. Published November 2005. Originally
approved in 1998. Last previous edition approved in 2004 as F 1890 – 04.
5.2.1 Ball Cannon—A device capable of shooting a ball at
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
a speed of 88 ft/s. The ball shall not have a spin rate in excess
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
of 10 rpm. Typical pitching machines cannot yield the aiming
Standards volume information, refer to the standard’s Document Summary page on
accuracyrequiredbythistestmethod.Cannonexhaustairmust
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

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