An adaptive tolerancing algorithm for freeform profiles

Luca Pagani*, Qunfen Qi, Jian Wang, Xiangqian Jiang, Paul J. Scott

*Corresponding author for this work

Research output: Contribution to journalSpecial issue (Academic Journal)peer-review


Manufacturing of freeform surfaces demands the development of tolerances based on the functionality of parts. Functionally critical portions of a surface can usually be described using the curvature of designed products. A uniform tolerance zone along the nominal freeform profile may not fulfill the functionality of the designed part, i.e. it allows the curvature to increase indefinitely inside the tolerance zone. This will affect greatly in the aerospace, automotive and other high value products. An adaptive tolerancing method based on the local curvature of a profile is presented to define smaller tolerance bands to reject non-functional products.

Original languageEnglish
Pages (from-to)185-189
Number of pages5
JournalProcedia CIRP
Publication statusPublished - 2018
Event15th CIRP Conference on Computer Aided Tolerancing, CIRP CAT 2018 - Milan, Italy
Duration: 11 Jun 201813 Jun 2018

Bibliographical note

Funding Information:
The authors gratefully acknowledge the UK’s Engineering and Physical Sciences Research Council (EPSRC) founding of the EPSRC Fellowship in Manufacturing: Controlling Variability of Products for Manufacturing (Ref: EP/K037374/1) and the EPSRC Future Metrology Hub (Ref: EP/P006930/1).

Publisher Copyright:
© 2018 The Authors. Published by Elsevier B.V.


  • Curvature
  • Freeform
  • Tolerance
  • Tolerance zone


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