top of page



Expand your knowledge in manufacturing




Chatter vibrations are encountered in all types of component machining - whether it is high speed aluminum machining or low speed steel, titanium machining. If not eliminated, chatter not only degrades part quality and tool life but also lowers productivity and increases cost per component. Chatter cannot be easily suppressed by trial-and-error type testing unless cutting parameters such as axial and radial depths are reduced at the cost of production slowdown.


This course focuses on the practice, more than the theory, of establishing a systematic approach to chatter avoidance prior to or encountered during actual machining. Participants will walk through the process of analyzing a problematic cutting process; identifying the root cause; and taking necessary corrective actions to reduce or completely eliminate chatter vibrations. The following topics will be covered during this course


  • Basics of chatter vibrations in machining

  • Introduction to industry standard tap-testing

  • Identification and troubleshooting of chatter in machining

  • Tips and tricks in determining ideal cutting conditions for CAM




By the end of this course, participants will be able to

  • Identify chatter in machining and most likely the root cause, e.g. tool/tool holder vs spindle

  • Systematically find ideal cutting conditions to eliminate existing chatter in production

  • Evaluate and compare chatter resistance of different tool/tool holder/machine sets

  • Determine optimum cutting parameters for a tool/tool holder/machine sets


This 2-day course is designed for test engineers and technicians who conduct modal deflection shape tests; perform experimental modal analysis; and, in general, are involved in acquisition and analysis of vibration data for the development of a modal model. Practical aspects of modal analysis theory, digital signals processing, excitation techniques, and modal parameter estimation are addressed. Upon completion of this course, the attendees will be able to plan, set-up and conduct a modal test from start to finish.


  1. Structural dynamics background

    • Structural dynamics of single and multiple degrees of freedom structures;

    • Physical and modal domains;

    • Frequency response function characteristics

  2. Frequency response measurements

    • Instrumentation;

    • Impact testing;

    • Measurement interpretation;

    • Improving measurement accuracy

  3. Modal parameter estimation

    • Single-mode method;

    • Multiple mode curve fitting; 

  4. Structural analysis

    • Multiple point impact testing;

    • Identification and interpretation of mode shapes;

    • Modal nodes

  5. Machine tool analysis

    • Machine tool specific modes;

    • Industrial case studies

bottom of page