From a mathematical point of view, concentricity is a property of rotationally symmetrical elements whose axes of symmetry coincide.<\/p>\n
Manufacturing technology sees it the other way around. For them, concentricity is a positional deviation that is characterized by an undesirable distance between the axes. <\/p>\n
Another word for this relationship is coaxiality<\/a>. Concentricity requirements mainly occur with stepped or grooved shafts<\/a> and bores. <\/p>\n <\/p>\n Concentricity belongs to the position tolerances<\/a> and there to the group of location tolerances that define the ideal location of an element in relation to specified reference elements.<\/p>\n Specifically, a concentricity tolerance describes a cylinder<\/a> with a specified diameter that is placed around the axis of rotation of a shaft or bore.<\/p>\n Its reference element is therefore always the axis of a rotationally symmetrical element. The tolerance of coaxiality<\/a> is therefore a special case of a location tolerance of the type position, which can also have other reference elements, for example plane surfaces. <\/p>\n The concentricity tolerance is a component of the concentricity tolerance<\/a> and itself includes the deviations of the toleranced element, or its axis of rotation, from straightness and parallelism<\/a> relative to the reference axis.<\/p>\n A lack of tolerance specifications for concentricity or an explicit specification of general tolerances for shape and position<\/a>, together with the third type of location tolerance, symmetry, is partly responsible for the fact that around four-fifths of technical drawings must be regarded as incomplete in practice, because properties essential for the function do not emerge from the dimensional tolerances alone.<\/p>\n As they can only tolerate concentricity for rotationally symmetrical parts and in relation to the axes of rotationally symmetrical elements, the tolerance specification<\/a> must always be connected to the corresponding diameter arrow.<\/p>\n The tolerance symbol for concentricity consists of two concentric circles and the tolerance value is marked with a diameter symbol, as is also possible with the related position tolerance<\/a> if you want to specify the position within a cylinder.<\/p>\n Another option is the specification as a general tolerance in accordance with DIN ISO 2768 by specifying general position tolerances<\/a> for your drawing by adding a lowercase letter to the designation of the general tolerance standard used.<\/p>\n Compliance with the specified limit values for concentricity is not possible via direct measurement.<\/p>\n Suitable testing devices generally determine the coaxiality<\/a> via a concentricity measurement, which also determines the relevant shape tolerances at the same time as the position tolerances<\/a>. Instead of explicit tolerance specifications for concentricity, you can therefore also tolerate concentricity. <\/p>\n This is particularly recommended if you do not have any measuring tools for determining the coaxiality deviation. Deviations can be easily identified in a visually designed measurement report<\/a> so that optimizations can be made quickly. <\/p>\n 3D measurement technology<\/a> offers suitable measuring systems. You can check concentricity with optical 3D measurement technology<\/a> without contact and therefore also inline during the production process. If you also want a complete view of the component in order to be able to check internal structures, we recommend industrial computed tomography<\/a>. <\/p>\n","protected":false},"excerpt":{"rendered":" From a mathematical point of view, concentricity is a property of rotationally symmetrical elements whose axes of symmetry coincide. Manufacturing technology sees it the other way around. For them, concentricity is a positional deviation that is characterized by an undesirable distance between the axes. Another word for this relationship is coaxiality. Concentricity requirements mainly occur […]<\/p>\n","protected":false},"author":4,"featured_media":12443,"template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"class_list":["post-12441","encyclopedia","type-encyclopedia","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/3dimetik.de\/en\/wp-json\/wp\/v2\/encyclopedia\/12441","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/3dimetik.de\/en\/wp-json\/wp\/v2\/encyclopedia"}],"about":[{"href":"https:\/\/3dimetik.de\/en\/wp-json\/wp\/v2\/types\/encyclopedia"}],"author":[{"embeddable":true,"href":"https:\/\/3dimetik.de\/en\/wp-json\/wp\/v2\/users\/4"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/3dimetik.de\/en\/wp-json\/wp\/v2\/media\/12443"}],"wp:attachment":[{"href":"https:\/\/3dimetik.de\/en\/wp-json\/wp\/v2\/media?parent=12441"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}What does concentricity mean in production metrology?<\/h2>\n
The relationship of concentricity to other tolerances<\/h2>\n
How are tolerances for concentricity specified?<\/h2>\n
Testing concentricity<\/h2>\n