{"id":357400,"date":"2024-10-20T01:16:45","date_gmt":"2024-10-20T01:16:45","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-67401987\/"},"modified":"2024-10-26T01:45:02","modified_gmt":"2024-10-26T01:45:02","slug":"bs-67401987","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-67401987\/","title":{"rendered":"BS 6740:1987"},"content":{"rendered":"

This International Standard specifies a method for determining departures from roundness by measuring variations in radius by means of contact (stylus) instruments.<\/p>\n

It establishes<\/p>\n

    \n
  1. types of instruments and gener requirements;<\/li>\n
  2. recommendations for the use of instrument<\/li>\n
  3. procedures for calibration of instruments a verification of their characteristics.<\/li>\n<\/ol>\n

    This International Standard applies to the assessment of the departures from ideal roundness of a workpiece through the medium of a profile transformation, obtained under reference conditions, expressed with respect to any one of the following centres:<\/p>\n

      \n
    1. centre of the least squares circl<\/li>\n
    2. centre of the minimum zone circl<\/li>\n
    3. centre of the minimum circumscribed circl<\/li>\n
    4. centre of the maximum inscribed circl<\/li>\n<\/ol>\n

      Each of these centres may have its own particular application. The position of the least squares centre can be calculated from a simple explicit equation given in Annex F.<\/p>\n

      Departures from roundness of the measured profile, procedure, calibration and determination of systematic errors of rotation are dealt with in Annex A to Annex D, respectively. Annex E gives rules for plotting and reading polar graphs.<\/p>\n

      \n

      NOTE 1 Profile transformation is defined in ISO 6318.<\/p>\n<\/blockquote>\n

      \n

      NOTE 2 Reference conditions include the stylus, frequency limitations of an electric wave filter (if used), permissible eccentricity of the graphical or digital representation of the profile (generally 7 % to 15 % of its mean radius, see Annex E), the position of the measured section or sections relative to some feature of the workpiece.<\/p>\n<\/blockquote>\n

      Uses contact (stylus) instruments.<\/p>\n","protected":false},"excerpt":{"rendered":"

      Method for determining departures from roundness by measuring variations in radius<\/b><\/p>\n\n\n\n\n
      Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
      BSI<\/b><\/a><\/td>\n1987<\/td>\n24<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":357411,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[256,2641],"product_tag":[],"class_list":{"0":"post-357400","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-17-040-30","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/357400","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/357411"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=357400"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=357400"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=357400"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}