ASTM_F_1436_-_11.pdf

Designation:F143611An American National StandardStandard Guide forCenter Serving Diameter Dimensions for Archery BowStrings1This standard is issued under the fixed designation F1436;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()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 the 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 cord 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 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 variousbows 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,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 braided line,or monofilament material,that is placed on the bow string nearits center.2.1.3.1 DiscussionThis wrapping covers the 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 height)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 string 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.2.1.7.1 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 specialcircumstances 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 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 prefer 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.Thealternative technique allows only the use of the fingers to drawand release the string and provide action on the nock to retain1This guide is under the jurisdiction of ASTM Committee F08 on SportsEquipment and Facilitiesand is the direct responsibility of Subcommittee F08.16 onArchery Products.Current edition approved Nov.1,2011.Published December 2011.Originallyapproved in 1992.Last previous edition approved in 2007 as F1436 07.DOI:10.1520/F1436-11.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 the arrow in position on the string.However,there are specificmethods of using the fingers,such as positioning 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 sn