ASTM D6205 - 20

    Standard Practice for Calibration of the James Static Coefficient of Friction Machine

    Active Standard ASTM D6205 | Developed by Subcommittee: D21.06

    Book of Standards Volume: 15.04

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    Significance and Use

    5.1 This practice is used to calibrate the James Machine for determination of static coefficient of friction of polish surfaces in accordance with Test Method D2047. Over considerable time and repeated use the James Machine may tend to mechanical misalignment, giving self-evident, anomalous readings. The periodic accumulation and comparison of data generated by this practice provides an indication of when the machine is no longer within the calibration limits and can no longer be expected to provide accurate and reliable data.

    5.2 Semi-automated James machines may perform an internal calibration/alignment test. These automated tests should be routinely run per the manufacturer's recommendation. If the repeatability tests of this practice indicate that the machine is out of calibration, the manufacturer should be contacted and their suggestions followed. Unqualified disassembly, modification, or adjustment may void the instrument warranty of semi-automated James Machines.

    1. Scope

    1.1 This practice covers the testing of the James Machine for repeatability of static coefficient of friction, relative to a standard reference interface consisting of the working surfaces of Borco2 board and standard leather shoe sole material, or a control polish film and standard leather shoe material. The practice provides basis data on the stability of the James Machine to ensure accurate static coefficient of friction determinations over time and repeated use and for determining if the James Machine is mechanically calibrated and properly aligned.

    1.2 This practice is written specifically for James Machines with manual or motorized test table transport. Variations of this practice for the calibration of versions of James Machines which are semi-automated are obvious. Calibration practices suggested by the manufacturer of semi-automatic James Machines should be followed in preference to this practice.

    1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D2047 Test Method for Static Coefficient of Friction of Polish-Coated Flooring Surfaces as Measured by the James Machine

    D2825 Terminology Relating to Polishes and Related Materials

    D4103 Practice for Preparation of Substrate Surfaces for Coefficient of Friction Testing

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E178 Practice for Dealing With Outlying Observations

    Federal Specification

    KK-L-165C Leather, Cattlehide, Vegetable Tanned and Chrome Tanned, Impregnated, and Soles Available from Standardization Documents Order Desk, Bldg 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Atten: NPODS.

    ICS Code

    ICS Number Code 19.060 (Mechanical testing); 61.060 (Footwear)

    UNSPSC Code

    UNSPSC Code 53110000(Footwear); 11162300(Leathers)

    Referencing This Standard
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    DOI: 10.1520/D6205-20

    Citation Format

    ASTM D6205-20, Standard Practice for Calibration of the James Static Coefficient of Friction Machine, ASTM International, West Conshohocken, PA, 2020,

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