提出了一种评价砂轮性能的新方法。该程序利用对磨削功率、磨削比和表面粗糙度的测量来估计最佳磨削条件，并表征试验轮相对于一系列不同硬度等级的标准轮的性能。测试车轮性能以一个称为坡度分布的新参数为特征。六个优质氧化铝车轮的结果显示，相对于一系列标准单晶氧化铝车轮，其等级范围为3到7。

A NEW METHOD IS PRESENTED FOR EVALUATING THE PERFORMANCE OF GRINDING WHEELS. THE PROCEDURE UTILIZES MEASUREMENTS OF THE GRINDING POWER, GRINDING RATIO, AND SURFACE ROUGHNESS TO ESTIMATE OPTIMAL GRINDING CONDITIONS AND CHARACTERIZE THE PERFORMANCE OF A TEST WHEEL RELATIVE TO A SERIES OF STANDARD WHEELS OF VARIOUS HARDNESS GRADES. TEST WHEEL PERFORMANCE IS CHARACTERIZED IN TERMS OF A NEW PARAMETER CALLED THE GRADE SPREAD. RESULTS ARE PRESENTED FOR SIX PREMIUM ALUMINUM OXIDE WHEELS WHICH SHOW GRADE SPREADS RANGING FROM 3 TO 7 RELATIVE TO A SERIES OF STANDARD MONOCRYSTALLINE ALUMINUM OXIDE WHEELS.