Focus Areas

• Test code for machine tools and test parameters for machine tool qualification
• Functional tests- Axes response for position and velocity, Spindle Vibrations, Machine Noise Accuracy aspects-Positioning
• Accuracy and Repeatability of axes, Interpolation accuracy (ball bar), Finish machining accuracy on IS/ISO test piece
• Static, Dynamic and Thermal aspects
• Sources of errors and their root cause identification
• National and International standards for determining Positional accuracy and Repeatability of machine tools
• Discussion on specific issues faced in industries-Accuracy, Chatter, Testing and Calibration.

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. Evaluation needs to be done in accordance with relevant parts of National / 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 measurements of geometrical alignments, and few functional tests under 'no load' conditions to qualify the machine performance and also for machine acceptance. However, the performance of a Machine tool is evaluated in terms of static and dynamic compliance to tolerances, surface finish of components and so on. These are essentially determined by static & dynamic accuracy of machine movements. A proper knowledge of, Static & Dynamic aspects, Calibration aspects like positioning & repeatability, cutting trials on standard work piece will helps users in assessing the capability of the machine.
Keeping this in view, Indian Machine Tool Manufacturers' Association (IMTMA) is organizing an online training on "Testing, calibration and Accuracy Measurement of CNC machine tools".

Key Takeaways

After undergoing the training, participants will be able to –

• Understand the various Testing Standards and methods
• Evaluation of Positional accuracy and Repeatability as per standards
• Understand the Spindle vibrations and Frequency analysis
• Understanding the Natural frequencies of machine structure
• Understanding the chatter occurrence and root cause analysis to reduce chatter
• Static, Dynamic and Thermal aspects of machine effecting accuracies
• Finish machining accuracies for machine acceptance
• Safety aspects of machines as per recent developments in standards.

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