ASTM_F_1889_-_05_2014.pdf

Designation:F188905(Reapproved 2014)An American National StandardStandard Guide forStraightness Measurement of Arrow Shafts1This standard is issued under the fixed designation F1889;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.INTRODUCTIONArrow shaft straightness is a desired characteristic.Unfortunately,straightness is currentlymeasured using varying methods at varying span lengths.The archery industry,as well as consumers,have recognized that it is difficult to compare measurements at these various spans using differentmeasurement methods.This guide proposes the use of a fixed span distance,for all but a few very short shafts,instead ofusing various spans based on various manufactured shaft lengths.The span length of 28 in.wasselected based on typical manufactured shaft lengths,as well as other ATA/ASTM industry standards.Using this arrow shaft straightness guide will benefit consumers as well as the archery industry.1.Scope1.1 This guide covers the formulation and designation ofstraightness measurement standards and nomenclature forarrow shafts.1.2 This guide is designed to provide manufacturers andconsumers a means for measuring the straightness of arrowshafts with tools and devices available in the archery industryand sport.1.3 The values stated in inch-pound units are to be regardedas the standard.The SI units given in parentheses are forinformation only.2.Terminology2.1 Definitions of Terms Specific to This Standard:2.1.1 arrow straightness,nthe conformance of the mate-rial or load axis of an arrow shaft to the true linear,longitudinalaxis of the shaft.2.1.2 standard total indicator reading(TIR),ntotal indi-cator reading of arrow shaft straightness obtained throughmethods outlined in this guide.3.Significance and Use3.1 The measurement system presented in this guide isintended to ensure uniform arrow shaft straightness measure-ment standards to avoid confusion of the consumer,whichresults from the use of different straightness measurementsystems.4.Measurement Guidelines for Arrow Shaft Straightness4.1 Straightness MeasurementThe most prevalent andcommonly accepted method of measuring arrow shaft straight-ness involves supporting the arrow shaft along a known,fixedspan,and using an indicator device while the arrow shaft isrotated about its axis on wheels or bearings.For this guide,aspan type measurement is to be used.The length of the arrowshaft to be tested,the span distance to be used,and theequipment to be used are defined as follows:4.1.1 Shaft LengthThe shaft length to be used for straight-ness measurement is the actual manufactured shaft length ofeach arrow shaft size/type.4.1.2 Span DistanceThe length of the span to be used forthis test is 28 in.(0.711 m)with a length tolerance of 60.125in.(3.2 mm).For those shafts that are manufactured less than29 in.in length,the span distance to be used is 25 in.(63.5 cm)and adjusted to an equivalent 28 in.reading using the approxi-mate conversion formula:Approximate Conversion Formula:28-in.straightness value=25-in.straightness value 28/25For example:straightness at 25 in.=0.0030 in.straightness at 28 in.=0.0030 in.28/25where 28/25=1.12,straightness at 28 in.=0.0030 in.1.12=0.0034 in.4.1.3 Measurement LocationArrow shafts shall be mea-sured for straightness at the center of the span.The tolerancefor the measurement location shall be equal to or better than60.250 in.(6.35 mm).1This guide is under the jurisdiction of ASTM Committee F08 on SportsEquipment,Playing Surfaces,and Facilities and is the direct responsibility ofSubcommittee F08.16 on Archery Products.Current edition approved Sept.1,2014.Published November 2014.Originallyapproved in 1998.Last previous edition approved in 2010 as F1889 05(2010).DOI:10.1520/F1889-05R14.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.1.4 Measurement EquipmentMeasurements shall betaken with a noncontact laser type optical measurement device.4.1.5 Support WheelsSupport wheels must feature low-friction bearings and exhibit a positive crown in order to limitthe contact area with the arrow shaft.4.1.6 Test DescriptionThe arrow shafts shall be rotatedabout its longitudinal axis while being measured for straight-ness at the center of the span.This rotation cancels out theeffect of gravity-induced sag.The rotation speed shall notexceed the resolution ability of the measurement device toensure accurate measurements.4.1.7 Shaft RoundnessAccuracy of this measurementmethod depends upon consistent roundness of the arrow shaft.In situations where shafts are not round,this attribute can befactored out of the straightness measurement by the use ofadditional measurement devices at the span supports.If thisadjustment method is used,