Process capability requirement under maximum material condition

Diplaris, SC; Sfantsikopoulos, MM

dc.contributor.author	Diplaris, SC	en
dc.contributor.author	Sfantsikopoulos, MM	en
dc.date.accessioned	2014-03-01T01:24:53Z
dc.date.available	2014-03-01T01:24:53Z
dc.date.issued	2006	en
dc.identifier.issn	0954-4054	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17493
dc.subject	geometrical tolerancing	en
dc.subject	position tolerance	en
dc.subject	process capability	en
dc.subject	machining cost	en
dc.subject.classification	Engineering, Manufacturing	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.other	INDEXES	en
dc.title	Process capability requirement under maximum material condition	en
heal.type	journalArticle	en
heal.identifier.primary	10.1243/09544054B08604	en
heal.identifier.secondary	http://dx.doi.org/10.1243/09544054B08604	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	A frequently used geometrical tolerance is the position tolerance. When it is assigned at the maximum material condition (MMC), an increase in the position tolerance is allowed, equal to the departure of the particular feature from the maximum material condition size. Neither concept - position tolerance and maximum material condition - analytically related with the exact coordinate dimensions that locate the feature. A feature position is usually allocated on the basis of its theoretically exact co-ordinate dimensions, whereas positional accuracy is pursued through an appropriate planning of the machining process in conjunction with appropriate machine tool(s) and/or jig(s). Exploitation of the MMC tolerance bonus is taken into account mainly during part inspection in order to reduce rejects. Such an approach is not systematic, considering that the MMC benefits are not taken directly into account in the process planning stage in order to control the overall process cost. In this paper, the permitted manufacturing errors of a feature size and position are considered and studied simultaneously in an analytical way. It is shown that a lower process capability (PC) requirement can then be established that leads to a significant process cost reduction. An application example demonstrates the use of the method and the obtained results are discussed.	en
heal.publisher	PROFESSIONAL ENGINEERING PUBLISHING LTD	en
heal.journalName	PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE	en
dc.identifier.doi	10.1243/09544054B08604	en
dc.identifier.isi	ISI:000242652200007	en
dc.identifier.volume	220	en
dc.identifier.issue	10	en
dc.identifier.spage	1629	en
dc.identifier.epage	1634	en