ASTM F1436-2007 Standard Guide for Center Serving Diameter Dimensions for Archery Bow Strings《射箭弓弦用中心卷缠直径尺寸的标准指南》.pdf

1、Designation: F 1436 07An American National StandardStandard Guide forCenter Serving Diameter Dimensions for Archery BowStrings1This standard is issued under the fixed designation F 1436; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisi

2、on, 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 guide covers the formulation of preliminary guide-lines for the outside diameter dimensions of t

3、he center servingsfor the shooting strings for archery bows.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 bow string, nspecial multi-strand co

4、rd that spans anarchery bow from end to end and is used to engage the rear endof an arrow in order to launch it into flight.2.1.2 bow string material, nstrands of various materials,both natural and synthetic, from which bow strings are made.2.1.2.1 DiscussionMost bow strings today are manufac-tured

5、from synthetic materials that have superior strength andresistance to wear and atmospheric conditions. Difference inthe tensile strength of the materials is responsible for adifference in the size and number of the strands in a bowstring.In addition, difference in the force necessary to draw various

6、bows may dictate varying numbers of strands of a givenmaterial to provide adequate strength for satisfactory service.The material used for wrapping to create a center serving isavailable in several sizes or diameters. This, combined withvariation in the number of strands used to make the mainstring,

7、 permits adjustment of the outside diameter of the centerserving within reasonable limits so that standardization ispractical.2.1.3 center serving, nwrapping of twisted or braidedline, or monofilament material, that is placed on the bow stringnear its center.2.1.3.1 DiscussionThis wrapping covers th

8、e area wherethe nock of the arrow engages the bow string. It is used to resistthe abrasive wear of repeated shots and also to provide a properfit with the slot of the nock.2.1.4 draw weight of the bow, npeak or maximum forcerequired to draw the bow string of a bow from its position atrest (brace hei

9、ght) to the full draw position.2.1.5 nock, nslot, or a special fitting that contains a slot,that is positioned at the rear end of an arrow to engage the bowstring.2.1.5.1 DiscussionThe slot maintains secure contact withthe bow string while the bow is being drawn, and also duringthe release of the st

10、ring and the return of the string to itsoriginal position before being drawn.2.1.6 string groove width or slot throat dimension,nnarrowest portion of the slot opening in the nock, usuallylocated near the open end of the slot.2.1.7 string hole size, ndimension at the bottom or base ofthe nock slot.2.

11、1.7.1 DiscussionThis is the area where the bow stringsits when it is seated in the slot.3. Significance and Use3.1 This guide is not meant to be all inclusive since thereare, and will continue to be, special circumstances that willdictate the use of nonconforming dimensions. These specialcircumstanc

12、es and the requirements that they establish cannotbe totally anticipated and therefore must be treated individu-ally.3.2 These guidelines are based on an analysis of presentlyused materials for the manufacture of bow strings and thestrength requirements dictated by archery bows falling withina draw

13、weight range of 0 to 100 lb (0 to 444.8 N).3.3 These guidelines also address the desirability of properfit of the arrow nock to the center serving.4. Fit of the Nock on the Center Serving4.1 Preferable FitWhile there are some instances wherethe practice is not followed, the majority of archers prefe

14、r thatthe nock of the arrow be retained on the bow string with aslight “snap-fit.” This is mandatory when the archer uses amechanical device to hook onto the string to draw the bow, andto aid in releasing the string to launch the arrow. The1This guide is under the jurisdiction of ASTM Committee F08

15、on SportsEquipment and Facilities and is the direct responsibility of Subcommittee F08.16 onArchery Products.Current edition approved Oct. 1, 2007. Published November 2007. Originallyapproved in 1992. Last previous edition approved in 2002 as F 1436 02.1Copyright ASTM International, 100 Barr Harbor

16、Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.alternative technique allows only the use of the fingers to drawand release the string and provide action on the nock to retainthe arrow in position on the string. However, there are specificmethods of using the fingers, such as pos

17、itioning all fingersunder the nock, that also require “snap-fit” action of the nock.In general, whether using a mechanical device or exclusivefinger release technique, most archers desire some “snap-fit” ofthe nock on the string.4.1.1 Too much snap-fit or pinch of the nock on the string isnot desira

18、ble, since it can cause shooting inaccuracies as wellas reduction in the velocity of the arrow in flight. Extremeinterference fit can result in failure of the nock as a result ofshock loading when the bow string is released. For thesereasons, it is important to be able to control nock-to-string fitw

19、ithin reasonable limits. Some snap-fit is desirable; too muchis undesirable.4.2 Influence of the Design and Manufacture of NocksMost of the separate nocks in use today are injection moldedplastic. Various designs take different approaches to obtain thedesired fit of the nock to the string. It is mos

20、t common toprovide a throat at the opening of the slot that is smaller thanthe diameter of the center serving and then enlarge the bottomof the slot to accept the serving diameter with a slightly looseor slight interference fit. The tangs of the nock have sufficientresilience to spring open to permi

21、t the nock to slip over theserving and then recover to retain the nock on the string. Tosome degree, the design of the nock and the amount ofresilience influences the dimension of the opening in the throatof the nock.4.3 Importance of Controlling Center Serving DiameterInorder to provide nock manufa

22、cturers with basic dimensions andtolerances on which to base their nock designs for the sizesused in greatest volume, it is necessary to establish standard-ized dimensions and tolerances for the outside diameter of thecenter servings on bow strings.5. Recommended Dimensions and Tolerances5.1 Center

23、Serving DiameterAnalysis has determined thattwo sizes of center serving diameter can permit sufficientlatitude to cover appropriate bow strings for bows ranging indraw weight from 0 to 100 lb (0 to 444.8 N). This is madepossible by varying the type of material used, the number ofstrands employed to

24、form the string, and the type and diameteror size of the material used to form the center serving. Theamount of tension used to apply the center serving will affector influence the diameter of the center serving. Experience hasrevealed that it is practical to hold the tolerance on the diameterto 60.

25、004 in. (0.10 mm). Therefore, the recommended diam-eters for the center servings of bow strings with the bow stringunder 100 lb tension are as follows:5.1.1 A serving size of 0.105 6 0.004 in. (2.667 6 0.10mm) is to be used for nocks with small throat sizes.5.1.2 A serving size of 0.118 6 0.004 in.

26、(2.997 6 0.10mm) is to be used for nocks with large throat sizes.6. Keywords6.1 bow string; center serving; nock; slot; string holeASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard

27、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 to revision at any time by the responsible technical committee and must be reviewed every five years andif no

28、t 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 Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which

29、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 is 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).F1436072