Attainable speeds for typical spindle bearing systems

A typical spindle bearing system, which can contain various bearing types, comprises a bearing arrangement on the tool end and another arrangement on the non-tool end. The arrangement on the tool end is usually the critical one. It typically uses larger bearings, forcing a higher speed factor A. Diagram 1 provides a comparison of possible bearing systems and their relative speed capability. The comparison is based on bearings with an 80 mm bore on the tool end and 70 mm bore on the non-tool end. For details about the bearing series, refer to the designation system of:
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