ASTM E2624-15
(Practice)Standard Practice for Torque Calibration of Testing Machines
Standard Practice for Torque Calibration of Testing Machines
SIGNIFICANCE AND USE
4.1 Testing machines that apply and indicate torque are used in many industries, in many ways. They may be used in a research laboratory to measure material properties, and in a production line to qualify a product for shipment. No matter what the end use of the machine may be, it is necessary for users to know the amount of torque that is applied, and that the accuracy of the torque value is traceable to the SI. This standard provides a procedure to verify these machines and devices, in order that the indicated torque values may be traceable. A key element to having metrological traceability is that the devices used in the calibration produce known torque characteristics, and have been calibrated in accordance with Practice E2428.
4.2 This standard may be used by those using, those manufacturing, and those providing calibration service for torque capable testing machines or devices and related instrumentation.
SCOPE
1.1 This practice covers procedures and requirements for the calibration of torque for static and quasi-static torque capable testing machines. These may, or may not, have torque indicating systems and include those devices used for the calibration of hand torque tools. Testing machines may be calibrated by one of the three following methods or combination thereof:
1.1.1 Use of standard weights and lever arms.
1.1.2 Use of elastic torque measuring devices.
1.1.3 Use of elastic force measuring devices and lever arms.
1.1.4 Any of the methods require a specific uncertainty of measurement, displaying metrological traceability to The International System of Units (SI).
Note 1: – for further definition of the term metrological traceability, refer to the latest revision of JCGM 200: International vocabulary of metrology — Basic and general concepts and associated terms (VIM).
1.2 The procedures of 1.1.1, 1.1.2, and 1.1.3 apply to the calibration of the torque-indicating systems associated with the testing machine, such as a scale, dial, marked or unmarked recorder chart, digital display, etc. In all cases the buyer/owner/user must designate the torque-indicating system(s) to be calibrated and included in the report.
1.3 Since conversion factors are not required in this practice, either english units, metric units, or SI units can be used as the standard.
1.4 Torque values indicated on displays/printouts of testing machine data systems—be they instantaneous, delayed, stored, or retransmitted—which are calibrated with provisions of 1.1.1, 1.1.2 or 1.1.3 or a combination thereof, and are within the ±1 % of reading accuracy requirement, comply with this practice.
1.5 The following applies to all specified limits in this standard: For purposes of determining conformance with these specifications, an observed value or a calculated value shall be rounded “to the nearest unit” in the last right-hand digit used in expressing the specification limit, in accordance with the rounding method of Practice E29, for Using Significant Digits in Test Data to Determine Conformance with Specifications.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: E2624 − 15
Standard Practice for
1
Torque Calibration of Testing Machines
This standard is issued under the fixed designation E2624; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope expressing the specification limit, in accordance with the
rounding method of Practice E29, for Using Significant Digits
1.1 This practice covers procedures and requirements for
in Test Data to Determine Conformance with Specifications.
the calibration of torque for static and quasi-static torque
1.6 This standard does not purport to address all of the
capable testing machines. These may, or may not, have torque
safety concerns, if any, associated with its use. It is the
indicating systems and include those devices used for the
responsibility of the user of this standard to establish appro-
calibration of hand torque tools. Testing machines may be
priate safety and health practices and determine the applica-
calibrated by one of the three following methods or combina-
bility of regulatory limitations prior to use.
tion thereof:
1.1.1 Use of standard weights and lever arms.
2. Referenced Documents
1.1.2 Use of elastic torque measuring devices.
2
2.1 ASTM Standards:
1.1.3 Useofelasticforcemeasuringdevicesandleverarms.
1.1.4 Any of the methods require a specific uncertainty of E6Terminology Relating to Methods of Mechanical Testing
E29Practice for Using Significant Digits in Test Data to
measurement, displaying metrological traceability to The In-
ternational System of Units (SI). Determine Conformance with Specifications
E74Practice of Calibration of Force-Measuring Instruments
NOTE 1—– for further definition of the term metrological traceability,
for Verifying the Force Indication of Testing Machines
refer to the latest revision of JCGM 200: International vocabulary of
E2428Practice for Calibration and Verification of Torque
metrology — Basic and general concepts and associated terms (VIM).
Transducers
1.2 The procedures of 1.1.1, 1.1.2, and 1.1.3 apply to the
2.2 NIST Technical Notes:
calibrationofthetorque-indicatingsystemsassociatedwiththe
NIST Technical Note 1297Guidelines for Evaluating and
testing machine, such as a scale, dial, marked or unmarked
Expressing the Uncertainty of NIST Measurement Re-
recorderchart,digitaldisplay,etc.Inallcasesthebuyer/owner/
3
sults
user must designate the torque-indicating system(s) to be
4
2.3 BIPM Standard:
calibrated and included in the report.
JCGM 200: International vocabulary of metrology — Basic
1.3 Since conversion factors are not required in this
and general concepts and associated terms (VIM)
practice, either english units, metric units, or SI units can be
used as the standard. 3. Terminology
1.4 Torque values indicated on displays/printouts of testing
3.1 Definitions: In addition to the terms listed, see Termi-
machine data systems—be they instantaneous, delayed, stored, nology E6.
or retransmitted—which are calibrated with provisions of
3.1.1 accuracy—the permissible variation from the correct
1.1.1, 1.1.2 or 1.1.3 or a combination thereof, and are within value.
the 61% of reading accuracy requirement, comply with this
3.1.1.1 Discussion—Atestingmachineissaidtobeaccurate
practice. if the indicated torque is within the specified permissible
variation from the actual torque. In this practice the word
1.5 The following applies to all specified limits in this
“accurate” applied to a testing machine is used without
standard: For purposes of determining conformance with these
numerical values. For example, “An accurate testing machine
specifications, an observed value or a calculated value shall be
rounded“tothenearestunit”inthelastright-handdigitusedin
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
1
ThispracticeisunderthejurisdictionofASTMCommitteeE28onMechanical Standards volume information, refer to the standard’s Document Summary page on
Testing and is the direct responsibility of Subcommittee E28.01 on Calibration of the ASTM website.
3
Mechanical Testing Machines and Apparatus. Available from National Institute of Standards and Technology (NIST), 100
Current edition approved Dec. 1, 2015. Published January 2016. Originally Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.
4
approved in 2009. Last previous edition approved in 2009 as E2624– 09. DOI: Available from BIPM (Bureau International des Poids et Mesures)- Pavillon de
10.1520/E2624-15. Breteuil F-92312 Sèvres Cedex FRANCE http://www.bipm.org
Copyright © ASTM International, 100 Barr Harb
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: E2624 − 09 E2624 − 15
Standard Practice for
1
Torque Calibration of Testing Machines and Devices
This standard is issued under the fixed designation E2624; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This practice covers procedures and requirements for the calibration of torque for static and quasi-static torque capable
testing machines or devices. machines. These may, or may not, have torque indicating systems and include those devices used for
the calibration of hand torque tools. Testing machines may be calibrated by one of the three following methods or combination
thereof:
1.1.1 Use of standard weights and lever arms.
1.1.2 Use of elastic torque measuring devices.
1.1.3 Use of elastic force measuring devices and lever arms.
1.1.4 Any of the methods require a specific uncertainty of measurement and a traceability derived from national standards of
mass and length.measurement, displaying metrological traceability to The International System of Units (SI).
NOTE 1—– for further definition of the term metrological traceability, refer to the latest revision of JCGM 200: International vocabulary of metrology
— Basic and general concepts and associated terms (VIM).
1.2 The procedures of 1.1.1, 1.1.2, and 1.1.3 apply to the calibration of the torque-indicating systems associated with the testing
machine, such as a scale, dial, marked or unmarked recorder chart, digital display, etc. In all cases the buyer/owner/user must
designate the torque-indicating system(s) to be calibrated and included in the report.
1.3 Since conversion factors are not required in this practice, either english units, metric units, or SI units can be used as the
standard.
1.4 Torque values indicated on displays/printouts of testing machine data systems—be they instantaneous, delayed, stored, or
retransmitted—which are Calibratedcalibrated with provisions of 1.1.1, 1.1.2 or 1.1.3 or a combination thereof, and are within the
61 % of reading accuracy requirement, comply with this practice.
1.5 The following applies to all specified limits in this standard: For purposes of determining conformance with these
specifications, an observed value or a calculated value shall be rounded “to the nearest unit” in the last right-hand digit used in
expressing the specification limit, in accordance with the rounding method of Practice E29, for Using Significant Digits in Test
Data to Determine Conformance with Specifications.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
E6 Terminology Relating to Methods of Mechanical Testing
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E74 Practice of Calibration of Force-Measuring Instruments for Verifying the Force Indication of Testing Machines
E2428 Practice for Calibration and Verification of Torque Transducers
2.2 NIST Technical Notes:
3
NIST Technical Note 1297 Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results
1
This practice is under the jurisdiction of ASTM Committee E28 on Mechanical Testing and is the direct responsibility of Subcommittee E28.01 on Calibration of
Mechanical Testing Machines and Apparatus.
Current edition approved April 1, 2009Dec. 1, 2015. Published May 2009January 2016. Originally approved in 2009. Last previous edition approved in 2009 as E2624–
09. DOI: 10.1520/E2624-09.10.1520/E2624-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from National Institute of Standards and Technology (NIST), 100 Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E2624 − 15
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2.3 BIPM Standard:
JCGM 200 : International vocabulary of m
...
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