{"id":559346,"date":"2024-11-05T18:23:40","date_gmt":"2024-11-05T18:23:40","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/esdu-960022011\/"},"modified":"2024-11-05T18:23:40","modified_gmt":"2024-11-05T18:23:40","slug":"esdu-960022011","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/esdu\/esdu-960022011\/","title":{"rendered":"ESDU 96002:2011"},"content":{"rendered":"

INTRODUCTION<\/strong><\/p>\n

Geneva mechanisms are used widely to generate intermittent
\nrotary motion from a continuously rotating input shaft. They have
\nmany features of interest to designers of industrial machinery
\nincluding simplicity of design, cost effectiveness, precise control
\nof the output position during motion and dwell periods, a wide
\nrange of feasible sizes, good reliability and long life.<\/p>\n

The principal disadvantage is the lack of versatility. Once the
\nnumber of the dwells per revolution of the wheel is chosen
\n(typically between 3 and 18), the shape of the motion curves and
\nthe ratio of motion period to dwell period are fixed. Finite
\naccelerations at the ends of the motion period will produce shock
\nloads. Although cam based indexing mechanisms can be designed with
\nbetter motion characteristics, these are usually more expensive and
\nin many applications a well designed Geneva mechanism is the most
\ncost-effective method for generating intermittent motion.<\/p>\n

There are two basic designs of Geneva mechanism; the external
\nGeneva (see Sketch 2.1a) and the internal Geneva (see Sketch 2.1b).
\nMany variations on these two types have been suggested (see
\nReferences 6 and 14) and most represent attempts to modify the
\nmotion characteristics for particular applications or to reduce
\nshock loads in mechanisms intended for high speed operation.
\nHowever, the basic designs have found wide use in many types of
\ninstruments and in industrial machinery and it is with these basic
\ndesigns that this Item is concerned. It is useful to calculate
\nvalues of many quantities (geometric parameters, kinematic
\ncharacteristics, forces, torques, stresses etc.) at the design
\nstage so that service failure by known modes can be avoided.<\/p>\n

This Data Item presents methods for calculating the important
\nindicators of performance of both internal and external Geneva
\nmechanisms. The analysis is time consuming and is best carried out
\nusing the associated computer program (ESDUpac A9611 \u2013 see
\nReference 11). The program determines values of wheel motion,
\nbearing forces, input torque, frame shaking force, contact stress
\nbetween the roller (or pin) and the slot, lubricant film thickness
\n(if applicable) and roller life (if applicable). In addition the
\nprogram finds limiting values of certain geometric parameters and
\nmakes a number of checks on the dimensions of the mechanism. In
\norder to communicate with other computer aided design software, a
\nDXF file (from which the outline of the Geneva wheel can be
\nplotted) is generated (for external Genevas only). This facility is
\ndescribed in greater detail in Section 5.2.4.<\/p>\n

Correct implementation of the calculation procedures suggested
\nin this Item should result in a decrease in design time together
\nwith improvements in machine reliability.<\/p>\n","protected":false},"excerpt":{"rendered":"

Geneva Mechanisms – Part 1: Design<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
ESDU<\/b><\/a><\/td>\n2011-02<\/td>\n60<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":559355,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2675],"product_tag":[],"class_list":{"0":"post-559346","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-esdu","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/559346","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\/559355"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=559346"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=559346"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=559346"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}