{"id":265750,"date":"2024-10-19T17:43:47","date_gmt":"2024-10-19T17:43:47","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-4261969\/"},"modified":"2024-10-25T13:42:09","modified_gmt":"2024-10-25T13:42:09","slug":"bs-4261969","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-4261969\/","title":{"rendered":"BS 426:1969"},"content":{"rendered":"<p><b>1.1 <\/b>This British Standard relates to fixed centres for use on machine tools and their auxiliary equipment, and in any other suitable circumstances such as on inspection or gauging equipment, etc.<\/p>\n<p><b>1.2 <\/b>The fixed centres specified in this standard fall into the following three series:<\/p>\n<ul>\n<li><i>Type <\/i>1. <i>Fixed centre, long series, standard Morse taper shank<\/i>. This type utilizes the Morse taper shank details, and conforms to relevant dimensions contained in ISO\/R 296<sup>1)<\/sup>, ISO\/R 298<sup>2)<\/sup> and BS 1660-1<sup>3)<\/sup>. The section forward of the gauge plane includes a parallel cylindrical portion (see Figure 1). When this type is fitted with a tungsten carbide tipped nose cone the amount of regrinding of the tip is strictly limited. Details showing the extent of regrinding are given in Figure 5.<\/li>\n<li><i>Type <\/i>2. <i>Fixed centre, short series, standard Morse taper shank<\/i>. This type conforms to Type 1 in respect of the dimensions rearward of the gauge plane. The section forward of the gauge plane conforms in part to Type 1, but it is arbitrary whether a parallel cylindrical portion is included forward of the gauge plane or whether the Morse taper is extended (see Figure 2).<\/li>\n<li><i>Type <\/i>3. <i>Half centre, long series, standard Morse taper shank<\/i>. This type utilizes the same basic dimensions as Type 1 with the exception that a portion of the centre forward of the gauge plane is cut away parallel to the axis of the centre (see Figure 3).<\/li>\n<\/ul>\n<blockquote>\n<p>NOTE The dimensions of the cutaway area align with those of DIN 806, \u201cLathe centres (60\u00b0)\u201d.<\/p>\n<\/blockquote>\n<p><sup>1)<\/sup> ISO\/R 296, \u201cSelf-holding tapers for tool shanks\u201d.<\/p>\n<p><sup>2)<\/sup> ISO\/R 298, \u201cLathe centres. Sizes for interchangeability\u201d.<\/p>\n<p><sup>3)<\/sup> BS 1660, \u201c<i>Machine tapers<\/i>\u201d, Part 1, \u201c<i>Self-holding tapers and gauges for self-holding tapers<\/i>\u201d.<\/p>\n<p>Materials, dimensions, tolerances, finish, etc., for three types of fixed centre for machine tools and auxiliary equipment, and for other suitable circumstances such as inspection or gauging equipment.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Specification for fixed centres for use on machine tools and in other applications<\/b><\/p>\n<table class=\"shortdes-table\" style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/bsi\/\"><b>BSI<\/b><\/a><\/td>\n<td>1969<\/td>\n<td>14<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":265759,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[390,2641],"product_tag":[],"class_list":{"0":"post-265750","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-25-060-20","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\/265750","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\/265759"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=265750"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=265750"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=265750"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}