Monitoring of thread quality when tapping nodular cast iron with TiN-coated HSS cutting taps

A. Gil Del Val, J. Fernández, E. Del Castillo, M. Arizmendi, F. Veiga

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Tapping is a widely employed but complex manufacturing process in which a multi-toothed tool, known as a tap, cuts a mating thread when driven into a hole. In this paper, the experiments, statistical analysis and the on-line implementation of a new thread quality monitoring system are presented for a tapping process in high-speed conditions. A multivariate statistical process control chart, for each tap, is presented based on the principal components of the torque directly measured from spindle motor drive. The on-line implementation of the multivariate chart provides tap wear warnings and alarms before the process starts producing unacceptable screw threads. The system is cost-effective since the tapping process can be run automatically without any operator intervention, does not require intrusive sensors, does not result in false negatives (defects) and provides an acceptable number of false positives.

Original languageEnglish (US)
Pages (from-to)1273-1282
Number of pages10
JournalInternational Journal of Advanced Manufacturing Technology
Issue number5-8
StatePublished - Nov 2013

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Software
  • Mechanical Engineering
  • Computer Science Applications
  • Industrial and Manufacturing Engineering


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