{"id":559231,"date":"2024-11-05T18:23:20","date_gmt":"2024-11-05T18:23:20","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/esdu-940112010\/"},"modified":"2024-11-05T18:23:20","modified_gmt":"2024-11-05T18:23:20","slug":"esdu-940112010","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/esdu\/esdu-940112010\/","title":{"rendered":"ESDU 94011:2010"},"content":{"rendered":"<p><strong>Follower type<\/strong><\/p>\n<p>The method presented in this Item is applicable to the design of<br \/>\ndisc cams with any one of the four types of crowned follower<br \/>\nillustrated in Sketch 2.1. The algorithm used to calculate the<br \/>\ncompressive contact stress at the surface (taken from ESDU 78035,<br \/>\nDerivation 1) is strictly applicable only to static contacts where<br \/>\nno traction forces act. In the contact zone between a cam and a<br \/>\ndomed or a flat-faced follower traction forces (due to friction)<br \/>\nare present. However, if the cam and follower are separated by a<br \/>\nfilm of lubricant, the coefficient of friction is likely to be very<br \/>\nlow (less than 0.1) and the values of compressive contact stress<br \/>\npredicted by the algorithm will be sufficiently accurate. Therefore<br \/>\nthis Item is applicable to the analysis of sliding contact (domed<br \/>\nor flat-faced) followers only if the lubrication regime can be<br \/>\ndescribed as &#034;mixed&#034; or &#034;elastohydrodynamic&#034; as described in ESDU<br \/>\n94008 and ESDU 94017 (References 22 and 23). If &#034;boundary&#034;<br \/>\nlubrication is predicted (ESDU 94008 and ESDU 94017) it is more<br \/>\ndifficult to be certain that the coefficient of friction is less<br \/>\nthan 0.1 and so results obtained using the computer program (see<br \/>\nSection 7) should be treated with caution.<\/p>\n<p><strong>Follower motion<\/strong><\/p>\n<p>The method presented in this Item can be used to analyse cams<br \/>\nwith a wide range of profiles. In cam design the relationship<br \/>\nbetween the motion of the cam and the motion of the follower,<br \/>\nduring a dwell-rise-dwell (DRD) or a dwell-return-dwell (DRD)<br \/>\nmotion, is usually governed by a mathematical equation known as a<br \/>\ncam law (see ESDU 82006, Reference 6). Although the theory<br \/>\n(presented in Section 3 of this Item) is general, in that any<br \/>\nmathematical cam law can be specified, the computer program (see<br \/>\nSection 7) contains only six commonly-used cam laws (identified in<br \/>\nSection 7.3.1). If the required cam law for a particular motion<br \/>\nsegment is not included in the current version of ESDUpac A9411,<br \/>\nthen the data can be entered as a motion data file.<\/p>\n<p>This motion data file must contain values of follower<br \/>\ndisplacement, follower velocity, follower acceleration and follower<br \/>\njerk at intervals of one degree of cam rotation. The required<br \/>\nformat of the file is described in Section 7.3.2 and the reasons<br \/>\nfor specifying motion in this way are explained in Section<br \/>\n4.1.1.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Contact Stress in Disc Cams with Domed or Flat Faced Followers<\/b><\/p>\n<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\/esdu\/\"><b>ESDU<\/b><\/a><\/td>\n<td>2010-07<\/td>\n<td>NA<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":0,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2675],"product_tag":[],"class_list":{"0":"post-559231","1":"product","2":"type-product","3":"status-publish","5":"product_cat-esdu","7":"first","8":"instock","9":"sold-individually","10":"shipping-taxable","11":"purchasable","12":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/559231","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:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=559231"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=559231"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=559231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}