1、Designation: F 1435 04An American National StandardStandard Specification forDesignation of the Balance Point Location for ArcheryArrows1This standard is issued under the fixed designation F 1435; the number immediately following the designation indicates the year oforiginal adoption or, in the case
2、 of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers the method of determining anddesignating the location of the bala
3、nce point of an arrowassembly for use with an archery bow.1.2 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.2. Terminology2.1 Definitions of Terms Specific to This Standard:2.1.1 Archery Trade Association (ATA), nthe
4、archeryindustry manufacturers organization that has originated somestandardized terms and configurations that are accepted andused universally.2.1.2 ATA arrow length, nthe length dimension from thebottom of the nock slot forward to a designated point near thefront or leading end of the arrow assembl
5、y. The designatedpoint varies to accommodate the different designs because ofthe 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 theopen forward end of the arrow shaft, the desig
6、nated point is thefront end of the arrow shaft, often referred to as the “cutlength” (Fig. 1).2.1.2.2 For arrows having the front end of the shaft taperedor swaged, the designated point is the most forward extensionof the full diameter of the shaft (Fig. 2).2.1.2.3 For arrows incorporating outserts,
7、 the designatedpoint is34 in. (19 mm) forward of the rearward end of theoutsert (Fig. 3).2.1.2.4 For arrows using heads that have integral cylindricalsockets incorporated within the basic head configuration, thedesignated point is the rearward end of the socket (Fig. 4).2.1.3 arrow point, na general
8、 term used to describe anypoint or head attached to the front end of an arrow.2.1.4 balance point, nthat location along the length of thearrow which, when positioned over a knife edge, will result inthe arrow being in a perfectly balanced condition. It is thelongitudinal location of the center of gr
9、avity of the arrowassembly.2.1.5 front of center (FOC), nfor good flight characteris-tics, the balance point or center of gravity of an arrow assemblymust be located at some position forward of the longitudinaldimensional center of the arrow. The FOC distance is not afixed dimension. It can vary wit
10、h the design of the arrowassembly and its components. It is also not necessarily aprecise dimension since satisfactory arrow flight can be1This specification is under the jurisdiction of ASTM Committee F08 on SportsEquipment and Facilities and is the direct responsibility of Subcommittee F08.16 onAr
11、chery Products.Current edition approved May 1, 2004. Published May 2004. Originallyapproved in 1994. Last previous edition approved in 1999 as F 1435 99.FIG. 1 Arrow Assembly Employing an Interchangeable PointInsert (See 2.1.2.1)FIG. 2 Arrow Assembly Having the Front End of the ShaftTapered or Swage
12、d (See 2.1.2.2)FIG. 3 Arrow Assembly Incorporating an Outsert (See 2.1.2.3)FIG. 4 Arrow Assembly With a Head That Has an IntergralCylindrical Socket (See 2.1.2.4)1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.achieved despite minor
13、variations of this factor. Its location isdetermined by measurement from the longitudinal dimensionalcenter of the ATA arrow length, and it is expressed by apercentage figure related to the length of the arrow and notedas FOC. A typical location would be 9 % FOC.2.1.6 insert, na machined or molded c
14、omponent, usuallywith a flange on the leading end, that is bonded into the frontend of the arrow shaft. The insert can have an internal threadto accept the threaded shank of an arrow point. The insert canalso have a tapered forward extension to permit mounting anarrow point with a tapered socket. Th
15、e majority of arrowassemblies are fitted with an insert of the first type to permit thearrow point to be interchanged very readily.2.1.7 integral socket arrow points, nmany arrow points,particularly those used on target or field arrows and includingsome hunting arrow heads, have integral sockets inc
16、orporatedinto the arrow point itself in order to accept the forward end ofthe arrow shaft. Arrows using points of these types requirespecial consideration when determining the standard ATAarrow length and method of establishing the FOC distance ofthe center of gravity or balance point of the arrow a
17、ssembly.2.1.8 nock slot, nthe slot located at the extreme rear of thearrow to permit it to be positioned on the shooting string of thebow and to be retained on the string during the drawing andlaunching of that arrow. Almost all arrows being manufacturedpresently are fitted with independent, replace
18、able, moldedplastic nock units that contain the slot.2.1.9 outsert, na component similar to an “insert,” exceptthat the rear is configured to fit over rather than into theforward end of the arrow shaft. In this manner, the “outsert” fitson the outside of the arrow shaft instead of on the inside, asd
19、oes the insert. Like the insert, the outsert can have an internalthread in its forward end to accept the threaded shank of anarrow point.3. Establishing the FOC Measurement3.1 Arrow Length BaseThe base for determining thepercentage location of the balance point of the arrow assemblyshall be the ATA
20、arrow length. This provides a constant basethat does not change (except in rare instances) when arrowpoints of different weight or length, or both, are interchanged.3.2 Configuration of the Arrow AssemblyWhen the bal-ance point of the arrow is determined, the arrow assembly shallbe complete with all
21、 components, including the arrow point inplace and mounted securely ready for shooting.3.3 Determining the Balance PointThe arrow assemblyshall be placed on a knife edge and moved longitudinally untilperfect balance is achieved. The location of the balance pointshall be marked accurately to permit s
22、ubsequent measurement.3.4 Calculation of Percent FOC:3.4.1 RecommendedFrom the bottom of nock slot, mea-sure the distance from the bottom of the nock slot to thebalance point. Calculate percent FOC using the followingformula:FOC, % 5 100A 2 L/2!L(1)where:A = distance from balance point to bottom of
23、slot, andL = ATA arrow length (see 2.1.2).3.4.2 OptionalFrom the front of the shaft assembly,measure the distance from the designated point (see 2.1.2) tothe balance point. Make certain to include the added incrementwhen dealing with arrow assemblies using outserts (see2.1.2.3). Calculate percent FO
24、C using the following formula:FOC, % 5 100L/2 2 B!L(2)where:B = distance from balance point to designated point (see2.1.2), andL = ATA arrow length (see 2.1.2).4. Keywords4.1 ATA arrow length; balance point; front of center; insert;nock slotASTM International takes no position respecting the validit
25、y of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject
26、 to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarter
27、s. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard i
28、s copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).F1435042
