Inspection & Testing of CNC Metal Cutting Machine Tools - IMTMA/M004

Programme Background

CNC Machines are deployed in diverse range of manufacturing industries. Users need to test Machine tools at the time of purchase and also periodically during its use and operation. Periodic assessment of a machine tool is of paramount importance to sustain geometrical, functional & machine accuracy capabilities in order to prevent unexpected breakdowns. Evaluation needs to be done in accordance with international standards & procedures which can be broadly categorized into three areas, mainly geometrical alignment test, functional & machine accuracy capabilities. Conventional testing methods of machine tools are limited essentially to static measurement of geometrical machine structures under 'no load' conditions. However the performance of a Machine tool is evaluated in terms of compliance to tolerances, surface finish of components and so on. These are essentially determined by static & working accuracy of machine movements. A proper knowledge of static & working test, positioning & repeatability test, cutting trials on standard work piece will helps users in assessing the capability of the machine.

Focus Areas
  • Review of terminology
  • Geometrical testing of CNC Machine tools
  • Static tests – machine alignment testing using test charts
  • Working tests : Load test, NAS test, Circularity by ball bar
  • Positioning & Repeatability test – Laser testing
  • Interpreting test charts and corrective actions
  • Sources of errors and their rectification
  • Vibration & Noise
  • Cutting trials on standard work piece
  • Machine acceptance with process capability
  • Discussion about specific problems faced in industries reg. machine accuracy, testing and calibration

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