ASME B107.28:2005 pdf download Electronic Torque Instruments
1 SCOPE
This Standard provides performance and safetyrequirements for manually operated electronic torqueinstruments with integral or interchangeable heads.Itincludes requirements for endurance, torque valueranges, and accuracy for these torque instruments.It isnot intended to describe products infrequently utilizedor those designed for special purposes.
2 CLASSIFICATION
Type I: Electronic torque instruments, 1% accuracyType II: Electronic torque instruments, 4% accuracy
3 REFERENCES
The following is a list of publications referenced inthis Standard
ASME B107.4M-1995, Driving and Spindle Ends for Portable Hand,Impact, Air and Electric Tools (PercussionTools Excluded)ASME B10710M-1996Handles and Attachments forHand Socket Wrenches – Inch and Metric SeriesPublisher: American Society of Mechanical Engineers(ASME), Three Park Avenue, New York, NY 10016-5990: Order Department: 22 Law Drive, Box 2300 orBox 2900 Fairfield,NJ 07007-2300 or -2900
ASTM E18-00, Standard Test Methods for RockwellHardness and Rockwell Superficial Hardness ofMetallic Materials
Publisher: American Society of Testing and Materials(ASTM)，100 Barr Harbor Drive, West Conshohocken.PA19428-2959
Guide to Hand Tools, Selection, Safety Tips, Proper Useand CarePublisher: Hand Tools Institute (HTI), 25 North Broadway,Tarrytown,NY 10591
4DEFINITIONS
accuracy: the allowable inaccuracy, also known as permissible deviation, tolerance, or error band. A highervalue means a lower certainty of correctness.
rated capacity: the maximum intended torque the usershall measure or apply.
5 REQUIREMENTS
The illustration shown herein is descriptive and notrestrictive, and is not intended to preclude the manufacture of an electronic torque instrument that is otherwisein accordance with this Standard. Conformance withrequirements not verified by test shall be established byvisual examination.Coatings composition and charac-teristics shall be determined either by appropriate testsor reference to manufacturer’s specifications, drawingsor procurement documents.
5.1 Design
The torque instrument shall be capable of electroni-cally indicating the torque applied through the use of atransducer and digital display. The torque value readoutshall be visible at a viewing angle up to 45 deg fromnormal.It shall have an integral power supply capable otmeeting the requirements specified in para.5.11.Whentested in accordance with para. 6.2, the maximum allowable digital conversion time shall not exceed 100 msec(minimum of 10 times per second).
5.2 Finish
Exterior surfaces of the torque instrument shall besmoothly finished. Sharp edges and corners capable ofcausing injury shall be removed, and parts subject tocorrosion shall be appropriately protected. Minor blemishes shall be permitted, provided they do not detractsubstantially from the appearance or operation of thetorque instrument. Protection from environmental damage shall be provided by suitable coating or transparentcover.
5.3 Coatings
Coatings shall be tightly adherent, uniform in appearance, and free from conditions that would prevent fullcompliance with the requirements of this Standard. Theyshall protect the base metal from corrosion under useand storage conditions normally associated with handtools, and they shall not peel. crack, or blister in such useor storage. Minor blemishes shall be permitted, providedthey do not detract substantially from the appearanceor operation of the torque instrument, Cadmium platingshall not be used as a coating.
5.4 Drives
Drives shall conform to the requirements of ASMEB107.4M.
ASME B107.28:2005 pdf download
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