ASTM F2219-04

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An American National Standard
Designation:F2219–04
Standard Test Methods for
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Measuring High Speed Baseball Bat Performance Factor
This standard is issued under the fixed designation F2219; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber 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 This specification defines a method for determining bat r i
mined by these test methods.
performancebymeasuringthebat-ballcoefficientofrestitution
3.1.4 ball inbound speed (v), n—inbound speed of a ball
(BBCOR),derivingthebatperformancefactor(BPF),deriving i
prior to impact with a bat as defined in this test method.
the ball exit speed ratio (BESR), and calculating a batted-ball
3.1.5 bat-ball coeffıcient of restitution (BBCOR)—CORofa
speed (BBS). It is applicable to baseball and softball bats of
specific ball colliding with a bat as defined in these test
any construction or material. The method provides a quantita-
methods. See coeffıcient of restitution (COR).
tive measure of bat dynamic performance that may be used for
3.1.6 bat performance factor (BPF), n—ratio of BBCOR to
comparison purposes.
ball COR as defined in these test methods.
1.2 The BBCOR, BPF, BESR, and BBS are each calculated
3.1.7 center of percussion (COP), n—also known as the
from measurements taken in the laboratory on test equipment
center of oscillation, the length of a simple pendulum with the
meeting the requirements defined in this specification.
same period as a physical pendulum, as in a bat oscillating on
1.3 The values stated in English units are to be regarded as
a pivot. Forces and impacts at this location will not induce
the standard.
axial reactions at the pivot point.
1.4 This standard does not purport to address all of the
3.1.8 coeffıcient of restitution (COR), n—measureofimpact
safety concerns, if any, associated with its use. It is the
efficiency calculated as the relative speed of the objects after
responsibility of the user of this standard to establish appro-
impact divided by the relative speed of the objects before
priate safety and health practices and determine the applica-
impact.
bility of regulatory limitations prior to use.
3.1.9 cycle, n—one complete performance of the oscillation
2. Referenced Documents
of the bat, specifically, one full swing of the bat.
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3.1.10 moment of inertia (MOI), n—measure of mass dis-
2.1 ASTM Standards:
tribution relative to an axis of rotation. It is the product of the
F1881 Test Method for Measuring Baseball Bat Perfor-
mass multiplied by the square of the distance to the mass,
mance Factor
summed over the entire bat.
F1887 Test Method for Measuring the Coefficient of Res-
3.1.11 period, n—time required for a pendulum to oscillate
titution (COR) of Baseballs and Softballs
through one complete cycle.
F 1888 Test Method for Compression-Displacement of
Baseballs and Softballs
4. Significance and Use
3. Terminology 4.1 This test method offers a laboratory the means to
measure the performance of baseball and softball bats.
3.1 Definitions of Terms Specific to This Standard:
4.2 Use of this test method can provide sports governing
3.1.1 balance point (BP), n—distance to the center of mass
bodies a means to compare calculated batted-ball speed and
of a bat when measured from the distal end of the bat knob.
other physical properties of the bat for the purposes of
3.1.2 ball exit speed (V), n—outbound speed of a ball
f
controlling the game.
following impact with a bat as defined in these test methods.
5. Apparatus
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This test method is under the jurisdiction ofASTM Committee F08 on Sports
5.1 Bat COP Apparatus:
EquipmentandFacilitiesandisthedirectresponsibilityofSubcommitteeF08.26on
5.1.1 Ruler, suitable for measuring lengths up to 42 in.
Baseball and Softball Equipment.
(1067 mm) to the nearest 0.031 in. (0.79 mm).
CurrenteditionapprovedJuly1,2004.PublishedJuly2004.Originallyapproved
e1
in 2002. Last previous edition approved in 2002 as F2219–02 . 5.1.2 Weight Scale, suitable for measuring weight up to 48
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
oz (1360 g) to the nearest 0.0035 oz (0.1 g).
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.1.3 Electronic Timer, suitable device sufficiently accurate
Standards volume information, refer to the standard’s Document Summary page on
for measuring time to the nearest 1 µs (0.000001 s).
the ASTM website.
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