ASTM F2219-05
(Test Method)Test Methods for Measuring High-Speed Bat Performance
Test Methods for Measuring High-Speed Bat Performance
SCOPE
1.1 This specification defines a method for determining bat performance by measuring the bat-ball coefficient of restitution (BBCOR), deriving the bat performance factor (BPF), deriving the ball exit speed ratio (BESR), and calculating a batted-ball speed (BBS). It is applicable to baseball and 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, BESR, 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 English 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 limitations prior to use.
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An American National Standard
Designation:F2219–05
Standard Test Methods for
1
Measuring High-Speed Bat Performance
This standard is issued under the fixed designation F 2219; 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 ball exit speed ratio (BESR), n—ratio of ball exit
speed (v ) to ball inbound speed (v) plus one-half, as deter-
1.1 These test methods define a method for determining bat r i
mined by these test methods.
performance by measuring the bat-ball coefficient of restitution
3.1.4 ball inbound speed (v), n—inbound speed of a ball
(BBCOR), deriving the ball exit speed ratio (BESR), and i
prior to impact with a bat as defined in this test method.
calculating a batted-ball speed (BBS). It is applicable to
3.1.5 bat-ball coeffıcient of restitution (BBCOR)—COR of a
baseball and softball bats of any construction or material. The
specific ball colliding with a bat as defined in these test
test methods provide quantitative measures of bat dynamic
methods. See coeffıcient of restitution (COR).
performance that may be used for comparison purposes.
3.1.6 center of percussion (COP), n—also known as the
1.2 The BBCOR, BESR, and BBS are each calculated from
center of oscillation, the length of a simple pendulum with the
measurements taken in the laboratory on test equipment
same period as a physical pendulum, as in a bat oscillating on
meeting the requirements defined in this specification.
a pivot. Forces and impacts at this location will not induce
1.3 The values stated in English units are to be regarded as
axial reactions at the pivot point.
the standard.
3.1.7 coeffıcient of restitution (COR), n—measure of impact
1.4 This standard does not purport to address all of the
efficiency calculated as the relative speed of the objects after
safety concerns, if any, associated with its use. It is the
impact divided by the relative speed of the objects before
responsibility of the user of this standard to establish appro-
impact.
priate safety and health practices and to determine the
3.1.8 moment of inertia (MOI), n—measure of mass distri-
applicability of regulatory limitations prior to use.
bution relative to an axis of rotation. It is the product of the
2. Referenced Documents mass multiplied by the square of the distance to the mass,
2
summed over the entire bat.
2.1 ASTM Standards:
F 1887 Test Method for Measuring the Coefficient of Res-
4. Significance and Use
titution (COR) of Baseballs and Softballs
4.1 This test method offers a laboratory the means to
F 1888 Test Method for Compression-Displacement of
measure the performance of baseball and softball bats.
Baseballs and Softballs
4.2 Use of this test method can provide sports governing
F 2398 Test Method for Measuring Moment of Inertia and
bodies a means to compare calculated batted-ball speed and
Center of Percussion of a Baseball or Softball Bat
other physical properties of bats.
3. Terminology
5. Apparatus and Equipment
3.1 Definitions of Terms Specific to This Standard:
5.1 Test Balls—Official baseballs and softballs approved for
3.1.1 balance point (BP), n—distance to the center of mass
play and tested in accordance with the following procedures.
of a bat when measured from the distal end of the bat knob.
5.1.1 Baseballs:
3.1.2 ball exit speed (V), n—outbound speed of a ball
f
5.1.1.1 Compression—300 to 375 lb at 0.25-in. deflection
following impact with a bat as defined in these test methods.
(1335 to 1668 N at 6.4 mm deflection), as determined in
accordance with Test Method F 1888. Balls to be labeled with
compression value.
1
This test method is under the jurisdiction of ASTM Committee F08 on Sports
5.1.1.2 Weight—5.00 to 5.25 oz (142 to 149 g). Balls to be
Equipment and Facilities and is the direct responsibility of Subcommittee F08.26 on
labeled with weight value.
Baseball and Softball Equipment.
5.1.1.3 Size—9.00 to 9.50 in. circumference (228.6 to 241.3
Current edition approved Oct. 15, 2005. Published November 2005. Originally
approved in 2002. Last previous edition approved in 2004 as F 2219 – 04.
mm). Balls to be labeled with size value.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.1.1.4 Ball COR—.525 to .550, as determined in accor-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
dance with Test Method F 1887. Balls to be labeled with COR
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. value and test speed in ft/s.
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