We now have a wide variety tools to help us perform Precision Maintenance® on belt driven machines. These include laser alignment to optimize the alignment of the pulleys, sonic tension gauges to optimize the static tension of the belts, but what about wear on the pulleys?We often just look at it and make a judgement based on appearance. Here is a more scientific approach to help you get the more life out of your belt drive and bearings. https://kvgo.com/Example/groove_gauge