Ball bar analysis is a method used to assess the accuracy and performance of a CNC machine by measuring the deviation of a circular path traced by a small ball bearing mounted on a probe, allowing technicians to identify potential issues like backlash, servo errors, and mechanical wear by analyzing the data collected during the test, ultimately leading to improved machine efficiency and part quality through early detection of problems and preventative maintenance. Ball bar analysis can pinpoint specific machine errors like backlash, reversal spikes, and geometric inaccuracies, providing detailed information about the source of the problem. By regularly performing ball bar tests, potential problems with a machine can be identified before they lead to significant quality issues or downtime, allowing for proactive maintenance and repairs.