Interest of the Inertial Tolerancing Method in the Case of Watch Making Micro Assembly

DOI: 10.1007/978-0-387-77405-3_18 In book: Micro-Assembly Technologies and Applications, Publisher: Springer US, pp.189-197
Source: OAI


A mechanical part to tolerance is traditionally expressed as a [Min Max] interval which allows the definition of the conformity
of the characteristic. Inertial tolerancing offers a new point of view of the conformity based on the mean square deviation
to the target. This article demonstrates the efficiency of inertial tolerancing and proposes a comparison with the traditional
tolerancing method in the case of watch making micro assembly.

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Available from: Maurice Pillet,
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    • "Inertial tolerancing is now a French standard [1]. The industrial application increase these last years in high quality companies such as watch making companies [7] In the case of products manufactured and sent by a supplier without any clear agreement on quality assurance, the customer must be ensured of the conformity of the lot by means of acceptance sampling. Standards currently available NFX 06-022 -MIL STD 105E [8] define how to calculate the size of the lot and the limits of acceptance in relation to the consumer and producer risks. "
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    ABSTRACT: Inertial tolerancing [1]-[3] presents is a statistical expression of a characteristic tolerance without defining the specification interval as is traditionally the case. Conformity is defined by "inertia" (Taguchi loss function [4]) around the target. Although this tolerancing method offers numerous advantages in terms of Quality/Cost ratio, it raises new problems in the customer/supplier relationship. This paper develops an acceptance sampling method design for inertial tolerancing and a sorting strategy when a lot is rejected
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    ABSTRACT: The weighted inertial piloting of processes presented in this paper is a break-away in terms of the quality of machined mechanical workpieces compared to the traditional piloting carried out by machine setters. However, sometimes one has a stability problem during the piloting phase due to over adjustment. We propose to study the causes of this instability and to develop an approach in order to correct the problems. Once we have reminded ourselves of the basics of weighted inertial tolerancing, we will propose an approach to identify the most probable decentring. The applications of the concepts discussed in this article were tested over a period of two months. The results are very convincing, especially with the elimination of the phenomenon previously observed in identical conditions.
    International Journal of Metrology and Quality Engineering 06/2011; 2(1):51-59. DOI:10.1051/ijmqe/2011009