ASTM F1435-04
(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 the standard. The values given in parentheses are for information only.
General Information
Relations
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
An American National Standard
Designation: F 1435 – 04
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 (e) 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.
1.2 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for
FIG. 1 Arrow Assembly Employing an Interchangeable Point
information only. Insert (See 2.1.2.1)
2. Terminology
the arrow being in a perfectly balanced condition. It is the
2.1 Definitions of Terms Specific to This Standard:
longitudinal location of the center of gravity of the arrow
2.1.1 Archery Trade Association (ATA), n—the archery
assembly.
industry manufacturer’s organization that has originated some
2.1.5 front of center (FOC), n—for good flight characteris-
standardized terms and configurations that are accepted and
tics, the balance point or center of gravity of an arrow assembly
used universally.
must be located at some position forward of the longitudinal
2.1.2 ATA arrow length, n—the length dimension from the
dimensional center of the arrow. The FOC distance is not a
bottom of the nock slot forward to a designated point near the
fixed dimension. It can vary with the design of the arrow
front or leading end of the arrow assembly. The designated
assembly and its components. It is also not necessarily a
point varies to accommodate the different designs because of
precise dimension since satisfactory arrow flight can be
the differences in arrow point design and attachment.
2.1.2.1 For arrows incorporating interchangeable point sys-
tem 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
FIG. 2 Arrow Assembly Having the Front End of the Shaft
Tapered or Swaged (See 2.1.2.2)
of the full diameter of the shaft (Fig. 2).
2.1.2.3 For arrows incorporating outserts, the designated
3
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
FIG. 3 Arrow Assembly Incorporating an Outsert (See 2.1.2.3)
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
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 May 1, 2004. Published May 2004. Originally FIG. 4 Arrow Assembly With a Head That Has an Intergral
approved in 1994. Last previous edition approved in 1999 as F 1435 – 99. Cylindrical Socket (See 2.1.2.4)
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
F1435–04
achieved despite minor variations of this factor. Its location is shall be the ATA arrow length. This provides a constant base
determined by measurement from the longitudinal dimensional that does not change (except in rare instances) when arrow
center of the ATA arrow length, and it is expressed by a points of different weight or length, or both, are interchanged.
percentage figure related to the length of the arrow and noted 3.2 Configuration of the Arrow Assembly—When the bal-
as FOC. A typical location would be 9 % FOC. ance point of the arrow is determined, the arrow assembly shall
2.1.6 insert, n—a machined or molded component, usually be complete with all components, including the arrow point in
with a flange on the leading end, that is bonded into the front place and mounted securely ready for shooting.
end of the arrow shaft. The insert can have an internal thread 3.3 Determining the Balance Point—The arrow assembly
to accept the threaded shank of an arrow point. The insert can
shall be placed on a knife edge and moved longitudinally until
also have a tapered forward extension to permit mounting
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.