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ASTM A1087 - A 1087M - 13.pdf

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ASTM A1087 - A 1087M - 13.pdf

Designation A1087/A1087M − 13Standard Practice forUsing Hand Calipers to Measure the Width of Steel Sheet1This standard is issued under the fixed designation A1087/A1087M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice defines procedures for measuring thewidth of steel sheet when decimal, not fraction tolerances areindicated. The ability to accurately measure width using handcalipers is critical in determining if product meets decimalspecifications. The methods described are designed and in-tended for use in the laboratory, mill situations, and generaluse.1.2 The flat steel product shall conform to all the require-ments of the appropriate specifications as follows Specifica-tions A917 and A924/A924M.1.3 Quantitative limits are not addressed and are establishedin the general requirements, or individual productspecifications, or both; or when applicable, as agreed tobetween supplier and user.1.4 This specification is applicable to orders in eitherinch-pound units or SI units. Values in inch-pound and SI unitsare not necessarily equivalent. Within the text, SI units areshown in brackets. Each system shall be used independently ofthe other.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards2A902 Terminology Relating to Metallic Coated Steel Prod-uctsA917 Specification for Steel Sheet, Coated by the Electro-lytic Process for Applications Requiring Designation ofthe Coating Mass on Each Surface General Require-mentsA924/A924M Specification for General Requirements forSteel Sheet, Metallic-Coated by the Hot-Dip Process3. Terminology3.1 DefinitionsSee Terminology A902 for definitions ofgeneral terminology.3.2 The definitions and procedures for measuring widthcharacteristics of steel sheet products are provided so thatpurchasers and suppliers have common definitions and mea-suring procedures for width measurements. The intention ofthese definitions and measuring methods is not to providedimensional specifications for width characteristics, but rathercommon procedures for quantifying width values. For deter-mining compliance with width specifications, references areprovided to appropriate ASTM standards.4. Apparatus4.1 Calipers used for width measurement shall be con-structed with parallel blades so the sheet can be placed betweenthem for measurement. The outside blades of a caliper are usedto measure the width of steel sheet; inside blades of a caliperare used to measure internal dimensions of non-sheet products.Calipers can be electrical digital, dial or analog with vernierscale, as shown in the photographs. See Fig. 1 and Fig. 2.4.2 Unlock the caliper and if electrical digital, turn it on.4.3 Clean caliper blades prior to use. Place cleaningmaterial, such as clean dry paper, lint-free cloth, or fabric notabrasive such as sandpaper on the outside blades and wipeclean. Repeat until the caliper is clean. Usually once or twiceis adequate.4.4 The typical method to hold or secure the caliper is tograsp the caliper, as shown in Fig. 3, with right hand and thesheet in left hand.4.5 Close the caliper by rotating the thumb wheel or slidingthe movable blade toward the fixed blade. The caliper isacceptable for use if it reads zero. If not, for electronic digitalcalipers, zero out reset the caliper per manufacturer’s instruc-tions. For dial and vernier calipers, adjust them to read zero permanufacturer’s instructions.NOTE 1 Mechanical calipers are sensitive to use and adjusting,recalibrate per manufacturer’s instructions.1This test method is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05.07 on Methods of Testing.Current edition approved Dec. 15, 2013. Published January 2014. Originallyapproved in 2013. DOI 10.1520/A1087_A1087M-132For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standard’s Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.6 Measure the material width by holding the caliper withthe right hand and sheet with the left hand. Open the caliperblades large enough so the sheet can be placed between theblades. Place the sheet fully within the outside blades and thentighten the outside blades until contact is made on the outsideedges of the sheet. For electronic digital calipers, read theviewing screen for the measurement. Follow the manufactur-er’s instructions for vernier scale or dial readout calipers.4.7 Repeat the measurement at the same location. If thereading matches the original measurement value, accept thereading. If the value does not match, take an additional reading.Average the three readings to arrive at the measurement value.Note that the caliper readings are subject to the accuracy of thetype of caliper used.4.8 Recording readings4.8.1 If required on the sheet sample, identify where thereadings was made using a circle, box, cross hairs, etc.4.8.2 In the measurement record of readings, use a traceableidentification back to the sheet sample.5. Calibration Checks5.1 It is common practice to calibrate calipers to NISTtraceable standards on an annual basis.5.2 Zero out the caliper.5.3 Measure an NIST traceable standard. Use a widthstandard in increments of 6.000 in. [150 mm] that is in theFIG. 1 a–cFIG. 2FIG. 3A1087/A1087M − 132width range of the sheet steel being measured. Example tomeasure, use two standards that bracket the sample widthwithin a range of 6.000 in. [150 mm]. If the caliper readings ofthe standards are satisfactory the device can be used to measuresheet steel with confidence. If the caliper readings are out bymore than 0.001 in. [0.025 mm], the device requires adjust-ment. See manufacturer’s instructions.6. Proper Care of the Instrument6.1 Do not disassemble a digital caliper.6.2 Store the caliper at room temperature, typically 60 to100 F [16 to 38 C].6.3 Keep the caliper clean and in a clean environment.6.4 Keep caliper away from liquids of any kind.6.5 Do not subject the caliper to sudden shocks such as fromdropping, or to excessive force during measuring.6.6 Wipe off dust, cutting chips, oil, and moisture from thecaliper after each use.6.7 When cleaning the caliper, use a soft cloth using aneutral detergent. Do not use any organic solvent thinner, etc.as it may cause damage to the device.6.8 Do not use an electric marking pen or other such deviceon the caliper.7. Keywords7.1 caliper; steel sheet; steel-sheetmetallic-coatedASTM International takes no position respecting the validity 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 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 Headquarters. 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 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 websitewww.astm.org. Permission rights to photocopy the standard may also be secured from the ASTM website www.astm.org/COPYRIGHT/.A1087/A1087M − 133

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