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Concurrent dimensioning for accuracy and cost
This item is provided by the institution :
National Technical University of Athens
Repository :
Digital Library of National Technical University of Athens | Dspace@NTUA
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ΕΚΤ item type
Journal part
(EN)
Scientific article
(EN)
EKT year
1995
(EN)
EKT historical period
Title
Concurrent dimensioning for accuracy and cost (EN)
Creator
Sfantsikopoulos, MM (EN)
Diplaris, SC (EN)
Papazoglou, PN (EN)
Description
The Cartesian coordinate system used for the geometrical, dimensional and accuracy description of a part is critical for programming CNC machining and achieving the required tolerances. Datum surfaces, fixture design, workpiece positioning and orientation in the machine tool workspace are directly influenced by the system which is adopted. On the other hand, constraints imposed by the available machining axes accuracy capabilities (i.e. accuracy of the available machine tools for the particular job) and the always present minimum machining cost requirement cannot be readily incorporated into the relevant considerations. In mechanical design, dimensional chains are frequent and observation of the specified tolerances - in conjunction with the geometrical ones - guarantees the part functionality. Definition of the workpiece zero point and the Cartesian coordinate system for CNC machining and/or measurement (CMM) and tolerance transfer to this system of the functional tolerances under the constraints mentioned is, as the industrial practice has shown, a difficult, tedious, experience demanding and time consuming task. In the paper an approach which has been developed for a systematic handling of this important engineering problem is presented. It is shown that the proposed algorithm and its CAD implementation constitute efficient tools for the analysis of the possible part dimensioning solutions. The designation of that zero workpiece point (ZWP) and Cartesian coordinate system which provide for minimum machining accuracy cost and for acceptable tolerances lying well within the machine tool accuracy capabilities is thus achieved. The complete methodology is further demonstrated and discussed in a 2 1/2 D case study and appropriate conclusions are drawn. © 1995 Springer-Verlag London Limited. (EN)
Type
journalArticle (EN)
Subject
Dimensioning (EN)
Tolerance optimisation (EN)
Automation & Control Systems (EN)
Manufacturability (EN)
Engineering, Manufacturing (EN)
Tolerancing (EN)
Manufacturing cost (EN)
Machine accuracy (EN)
Provider
National Technical University of Athens
Repository / collection
Digital Library of National Technical University of Athens | Dspace@NTUA
Subcollections
Κεντρική Βιβλιοθήκη Ε.Μ.Π.
Ιδρυματικό Αποθετήριο
Δημοσιεύσεις μελών Δ.Ε.Π. σε περιοδικά
Journal
The International Journal of Advanced Manufacturing Technology (EN)
Language
English
Issued
1995 (EN)
Identifier
http://hdl.handle.net/123456789/11476
4 (EN)
268 (EN)
ISI:A1995RQ55300004 (EN)
10.1007/BF01186877 (EN)
0268-3768 (EN)
10 (EN)
263 (EN)
Publisher
Springer-Verlag (EN)
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