document: An adaptive sphere-fitting method for sequential tolerance control The machining of complex parts typically involves a logical and chronological sequence of n operations on m machine tools . Because manufacturing datums can not always match design constraints , some of the design specifications imposed on the part are usually satisfied by distinct subsets of the n operations prescribed in the process plan . Conventional tolerance control specifies a fixed set point for each operation and a permissible variation about this set point to insure compliance with the specifications , whereas sequential tolerance control -LRB- STC -RRB- uses real-time measurement information at the completion of one stage to reposition the set point for subsequent operations . However , it has been shown that earlier sphere-fitting methods for STC can lead to inferior solutions when the process distributions are skewed . This paper introduces an extension of STC that uses an adaptive sphere-fitting method that significantly improves the yield in the presence of skewed distributions as well as significantly reducing the computational effort required by earlier probabilistic search methods
doc_bio_tags: O O O O O B I I O O O O O O O O O O O O O O O O O B I O O O O O O O O B I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B O O O O O B I I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I O O O O O O B I O O O O O O
extractive_keyphrases: machine tools sequential tolerance control design constraints compliance skewed distributions computational effort
abstractive_keyphrases: adaptive sphere-fitting method real-time measurement information yield improvement