CBN grinding wheels use the synthetic abrasive cubic boron nitride to easily grind tough, ferrous materials like high-speed tool steel. However, even superabrasives dull and wear over time, and will need to be dressed and re-trued occasionally. Two main aspects of the grinding process affect wheel performance, the quality of the grinding wheel and the quality of the machine. Let’s take a look at the best ways you can maintain and even improve the performance of your CBN grinding wheel.
To ensure your grinding wheel is performing optimally there are a few standards of operation you must follow. First, you must ensure the wheel is mounted on flanges and spindles that are clean, free of burrs or debris and the spindle bearings are tight with no play. Next, the grinding wheel needs to run at an optimal spindle speed (RPM) based on its diameter. This is a vital step to ensure proper wheel life, material removal rates, and surface finish. For CBN wheels, we recommend a SFPM speed of between 5500 and 7500 SFPM. You can calculate this using the formula below or download the SFPM calculator.
Truing and dressing your grinding wheel are two essential actions to perform before executing your first cut. They are also necessary for general wheel maintenance. Truing removes both the bond and abrasive to create a smooth, even wheel shape that runs perfectly true to your machine spindle. Truing leaves the surface of the wheel glazed and not yet ready for cutting.