ASTM F1435-08
(Specification)Standard Specification for Designation of the Balance Point Location for Archery Arrows
Standard Specification for Designation of the Balance Point Location for Archery Arrows
ABSTRACT
This specification covers the method of determining and designating the balance point location of an arrow assembly for use with an archery bow. The base for determining the percentage location of the balance point of the arrow assembly shall be the ATA (Archery Trade Association) arrow length. When the balance point of the arrow is determined, the arrow assembly shall be complete with all components, including the arrow point in place and mounted securely ready for shooting. In determining the balance point, the arrow assembly shall be placed on a knife edge and moved longitudinally until perfect balance is achieved. The FOC (front of center) shall be measured as follows: from the bottom of nock slot, measure the distance from the bottom of the nock slot to the balance point; or from the front of the shaft assembly, measure the distance from the designated point to the balance point. The percent FOC shall be calculated using the specified formula. The following arrow assemblies are illustrated: (1) arrow assembly employing an interchangeable point insert (2) arrow assembly having the front end of the shaft tapered or swaged, (3) arrow assembly incorporating an outsert, and (4) arrow assembly with a head that has an integral cylindrical socket.
SCOPE
1.1 This specification covers the method of determining and designating the location of the balance point of an arrow assembly for use with an archery bow.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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Designation:F1435 −08 AnAmerican National Standard
Standard Specification for
Designation of the Balance Point Location for Archery
1
Arrows
This standard is issued under the fixed designation F1435; 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 2.1.4 balance point, n—that location along the length of the
arrow which, when positioned over a knife edge, will result in
1.1 This specification covers the method of determining and
the arrow being in a perfectly balanced condition. It is the
designating the location of the balance point of an arrow
longitudinal location of the center of gravity of the arrow
assembly for use with an archery bow.
assembly.
1.2 The values stated in inch-pound units are to be regarded
2.1.5 front of center (FOC), n—for good flight
as standard. The values given in parentheses are mathematical
characteristics, the balance point or center of gravity of an
conversions to SI units that are provided for information only
arrow assembly must be located at some position forward of
and are not considered standard.
the longitudinal dimensional center of the arrow. The FOC
2. Terminology
distance is not a fixed dimension. It can vary with the design of
the arrow assembly and its components. It is also not neces-
2.1 Definitions of Terms Specific to This Standard:
sarily a precise dimension since satisfactory arrow flight can be
2.1.1 Archery Trade Association (ATA), n—the archery in-
achieved despite minor variations of this factor. Its location is
dustry manufacturer’s organization that has originated some
determined by measurement from the longitudinal dimensional
standardized terms and configurations that are accepted and
center of the ATA actual arrow length, and it is expressed by a
used universally.
percentage figure related to the length of the arrow and noted
2.1.2 ATA actual arrow length, n—the length dimension
as FOC. To reference typical FOC locations see 3.4.1.
from the bottom of the nock slot forward to a designated point
2.1.6 insert, n—a machined or molded component, usually
near the front or leading end of the arrow shaft. The designated
with a flange on the leading end, that is bonded into the front
point varies to accommodate the different designs because of
end of the arrow shaft. The insert can have an internal thread
the differences in arrow point design and attachment.
to accept the threaded shank of an arrow point. The insert can
2.1.2.1 For arrows incorporating interchangeable point sys-
also have a tapered forward extension to permit mounting an
tem inserts and other point or adaptor types that insert into the
arrow point with a tapered socket. The majority of arrow
open forward end of the arrow shaft, the designated point is the
assemblies are fitted with an insert of the first type to permit the
front end of the arrow shaft, often referred to as the “cut
arrow point to be interchanged very readily.
length” (Fig. 1).
2.1.2.2 For arrows having the front end of the shaft tapered
2.1.7 integral socket arrow points, n—many arrow points,
or swaged, the designated point is the most forward extension
particularly those used on target or field arrows and including
of the full diameter of the shaft (Fig. 2).
some hunting arrow heads, have integral sockets incorporated
2.1.2.3 For arrows incorporating outserts, the designated
into the arrow point itself in order to accept the forward end of
3
point is ⁄4 in. (19 mm) forward of the rearward end of the
the arrow shaft. Arrows using points of these types require
outsert (Fig. 3).
special consideration when determining the standard ATA
2.1.2.4 For arrows using heads that have integral cylindrical
arrow length and method of establishing the FOC distance of
sockets incorporated within the basic head configuration, the
the center of gravity or balance point of the arrow assembly.
designated point is the rearward end of the socket (Fig. 4).
2.1.8 nock slot, n—the slot located at the extreme rear of the
2.1.3 arrow point, n—a general term used to describe any
arrow to permit it to be positioned on the shooting string of the
point or head attached to the front end of an arrow.
bow and to be retained on the string during the drawing and
launching of that arrow.Almost all arrows being manufactured
1
This specification is under the jurisdiction of ASTM Committee F08 on Sports
presently are fitted with independent, replaceable, molded
Equipment and Facilitiesand is the direct responsibility of Subcommittee F08.16 on
plastic nock units that contain the slot.
Archery Products.
Current edition approved Nov. 1, 2008. Published December 2008. O
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
An American National Standard
Designation:F1435–04 Designation: F 1435 – 08
Standard Specification for
Designation of the Balance Point Location for Archery
1
Arrows
This standard is issued under the fixed designation F 1435; 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
1.1 This specification covers the method of determining and designating the location of the balance point of an arrow assembly
for use with an archery bow.
1.2The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information
only.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
2. Terminology
2.1 Definitions of Terms Specific to This Standard:
2.1.1 Archery Trade Association (ATA), n— the archery industry manufacturer’s organization that has originated some
standardized terms and configurations that are accepted and used universally.
2.1.2 ATA actual arrow length, n—the length dimension from the bottom of the nock slot forward to a designated point near
the front or leading end of the arrow assembly.shaft. The designated point varies to accommodate the different designs because
of the differences in arrow point design and attachment.
2.1.2.1 For arrows incorporating interchangeable point system inserts and other point or adaptor types that insert into the open
forward end of the arrow shaft, the designated point is the front end of the arrow shaft, often referred to as the “cut length” (Fig.
1).
2.1.2.2 For arrows having the front end of the shaft tapered or swaged, the designated point is the most forward extension of
the full diameter of the shaft (Fig. 2).
3
2.1.2.3 For arrows incorporating outserts, the designated point is ⁄4 in. (19 mm) forward of the rearward end of the outsert (Fig.
3).
2.1.2.4 For arrows using heads that have integral cylindrical sockets incorporated within the basic head configuration, the
designated point is the rearward end of the socket (Fig. 4).
2.1.3 arrow point, n—a general term used to describe any point or head attached to the front end of an arrow.
2.1.4 balance point, n—that location along the length of the arrow which, when positioned over a knife edge, will result in the
arrow being in a perfectly balanced condition. It is the longitudinal location of the center of gravity of the arrow assembly.
2.1.5 front of center (FOC), n—for good flight characteristics, the balance point or center of gravity of an arrow assembly must
belocatedatsomepositionforwardofthelongitudinaldimensionalcenterofthearrow.TheFOCdistanceisnotafixeddimension.
It can vary with the design of the arrow assembly and its components. It is also not necessarily a precise dimension since
satisfactory arrow flight can be achieved despite minor variations of this factor. Its location is determined by measurement from
the longitudinal dimensional center of theATAactual arrow length, and it is expressed by a percentage figure related to the length
of the arrow and noted as FOC. A To reference typical location would be 9% FOC. FOC locations see 3.4.1.
2.1.6 insert, n—a machined or molded component, usually with a flange on the leading end, that is bonded into the front end
of the arrow shaft. The insert can have an internal thread to accept the threaded shank of an arrow point. The insert can also have
a tapered forward extension to permit mounting an arrow point with a tapered socket. The majority of arrow assemblies are fitted
with an insert of the first type to permit the arrow point to be interchanged very readily.
2.1.7 integral socket arrow points, n—many arrow points, particularly those used on target or field arrows and including some
hunting arrow heads, have integral sockets incorporated into the arrow point itself in order to accept the forward end of the arrow
shaft. Arrows using points of these types require special consideration when determining the standard ATA arrow length and
1
This specification is under the jurisdiction of ASTM Committee F08 on Sports Equipment and Facilities and is the direct responsibility of Subcommittee F08.16 on
Archery Products.
Current edition approved MayNov. 1, 2004.2008. Published May 2004.Dece
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