ASTM F2031-05
(Test Method)Standard Test Method for Measurement of Arrow Shaft Static Spine (Stiffness)
Standard Test Method for Measurement of Arrow Shaft Static Spine (Stiffness)
SIGNIFICANCE AND USE
This test method is intended to provide a stable industry standard by which benchmarks and comparisons can be made by manufacturers and consumers.
This test method is intended to clarify and define arrow spine or stiffness as it pertains to the archery industry and sport.
SCOPE
1.1 This test method covers the formulation and designation of arrow spine measurement standards and nomenclature for arrow shafts.
1.2 The English system of measurement, specifically inches of deflection, shall be used for all spine values expressed for a given arrow shaft.
1.3 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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Standards Content (Sample)
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An American National Standard
Designation:F2031–05
Standard Test Method for
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Measurement of Arrow Shaft Static Spine (Stiffness)
This standard is issued under the fixed designation F2031; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope with a known weight depending from or pressing upon the
arrow shaft at the exact center between the supports for the
1.1 This test method covers the formulation and designation
shaft. For this test method, a span type measurement is to be
of arrow spine measurement standards and nomenclature for
used. The length of the arrow shaft to be tested, the span
arrow shafts.
distance to be used, and the equipment to be used are defined
1.2 The English system of measurement, specifically inches
as follows:
of deflection, shall be used for all spine values expressed for a
4.1.1 Shaft Length— The shaft length to be used for
given arrow shaft.
standard spine measurement is the span distance plus 1 in. to
1.3 This standard does not purport to address all of the
allow for axial travel during deflection.
safety concerns, if any, associated with its use. It is the
4.1.2 Span Distance— The length of the span to be used for
responsibility of the user of this standard to establish appro-
this test is 28 in. (71.1 cm). For those shafts that are
priate safety and health practices and determine the applica-
manufactured less than 29 in. (73.7 cm) in length, the span
bility of regulatory limitations prior to use.
distance to be used is 23 in. (58.4 cm).
2. Terminology 4.1.2.1 Span = 28 in. (71.1 cm) for shafts longer than 29 in.
(73.7 cm).
2.1 Definitions of Terms Specific to This Standard:
4.1.2.2 Span = 23 in. (58.4 cm) for shafts shorter than 29 in.
2.1.1 arrow spine—the deflection of the shaft, measured in
(73.7 cm).
inches, in a three-point load scenario where a specified mass is
4.1.2.3 Approximate conversion formula to convert a spine
applied to the midpoint of the arrow shaft supported at a fixed
at 23 in. (58.4 cm) span to a 28 in. (71.1 cm) span:
span.
3 3 3 3
2.1.2 spine around shaft variation—spine variation between
28 in. ~71.1 cm ! 5 1.804
four readings taken at 90° spacing around the shaft. 3 3 3 3
23 in. ~58.4 cm !
2.1.3 static spine—stiffness of the arrow shaft at rest on a
or 23 in. (58.4 cm) spine 3 1.804 = 28 in. (71.1 cm) spine
spine measurement device.
4.1.3 Measurement Location—Arrow shafts shall be mea-
3. Significance and Use sured for spine at the center of the span. In instances where this
is not practical due to shaft design, the manufacturer shall
3.1 This test method is intended to provide a stable industry
disclose the measurement location(s) from an identifiable
standard by which benchmarks and comparisons can be made
datum on the shaft.
by manufacturers and consumers.
4.1.4 Measurement Equipment—Measurement equipment
3.2 This test method is intended to clarify and define arrow
may involve the use of dial indicators, probe indicators, and
spineorstiffnessasitpertainstothearcheryindustryandsport.
laser gauging devices.
4. Measurement Guidelines for Arrow Spine 4.1.4.1 Mechanical Indicators—In the case of mechanical
indicators, probe pressure should be limited to no more than
4.1 Arrow Spine Measurement—The most prevalent and
0.176 oz (5 g).
commonly accepted method of measuring arrow shaft spine
4.1.4.2 Noncontact Gauging Equipment—Noncontactgaug-
involves supporting the arrow shaft along a known, fixed span,
ing equipment, such as laser gauging equipment, shall read to
and using an indicator device while the arrow shaft is deflected
within0.001in.ofmechanicalcontactmeasurementequipment
conforming to the test methods and specifications outlined
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This test method is under the jurisdiction of ASTM Committee F08 on Sports
herein.
Equipment and Facilities and is the direct responsibility of Subcommittee F08.16 on
4.1.5 Span Support Points—Support points shall allow free
Archery Products.
axial travel of the shaft as the shaft is deflected during
Current edition approved Oct. 1, 2005. Published October 2005. Originally
approved in 2000. Last previous edition approved in 2000 as F2031 – 00. DOI:
measurement.
10.1520/F2031-05.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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F2031–05
4.1.5.1 Span Support Point Configuration—The shaft sup- 5.3 The shaft span for which the reading has been taken
port point shall have a maximum diameter of 0.125 in. (3.175 shall be clearly defined in English units, specifically inches (for
mm) at the point of contact
...
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