ASTM F2031-05(2010)

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.

General Information

• Status: Historical
• Publication Date: 30-Apr-2010
• ICS: 97.220.40 - Outdoor and water sports equipment
• Technical Committee: F08 - Sports Equipment, Playing Surfaces, and Facilities
• Drafting Committee: F08.16 - Archery Products

Relations

• Replaces: ASTM F2031-05 - Standard Test Method for Measurement of Arrow Shaft Static Spine (Stiffness)
• Effective Date: 01-May-2010

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
Designation: F2031 − 05(Reapproved 2010) An American National Standard
Standard Test Method for
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 Thistestmethodcoverstheformulationanddesignation
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=23in.(58.4cm)forshaftsshorterthan29in.
2.1.1 arrow spine—the deflection of the shaft, measured in
inches, in a three-point load scenario where a specified mass is (73.7 cm).
applied to the midpoint of the arrow shaft supported at a fixed
4.1.2.3 Approximate conversion formula to convert a spine
span.
at 23 in. (58.4 cm) span to a 28 in. (71.1 cm) span:
2.1.2 spine around shaft variation—spine variation between 3 3 3 3
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 × 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
suredforspineatthecenterofthespan.Ininstanceswherethis
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
involves supporting the arrow shaft along a known, fixed span, 4.1.4.2 Noncontact Gauging Equipment—Noncontact gaug-
andusinganindicatordevicewhilethearrowshaftisdeflected
ing equipment, such as laser gauging equipment, shall read to
within0.001in.ofmechanicalcontactmeasurementequipment
conforming to the test methods and specifications outlined
This test method is under the jurisdiction of ASTM Committee F08 on Sports
herein.
Equipment
...