在金属切削中，众所周知，Q/P的值，即切向力Q和径向力P的比值，在加工和磨削中有着显著的不同。本文通过一个简单的模型试验，综合考虑加工和磨削两个因素，系统地研究了产生这种差异的基本因素的影响。实验结果表明，与机械加工相比，在磨削过程中，切削刃与工件的干涉深度、切削速度、切削刃状态等基本因素的值都朝着降低切削力比的方向发展。结果表明，磨削力比由干涉长度和磨粒每刃最大干涉深度的乘积控制。

IN METAL CUTTING, IT IS A WELL-KNOWN FACT THAT THE VALUE OF Q/P, WHICH IS THE RATIO OF THE TANGENTIAL FORCE Q AND THE RADIAL FORCE P, IS REMARKABLY DIFFERENT IN MACHINING AND GRINDING. IN THIS PAPER, CONSIDERING MACHINING AND GRINDING COLLECTIVELY, INVESTIGATION ON THE EFFECTS OF BASIC FACTORS WHICH PRODUCE SUCH DIFFERENCES SYSTEMATICALLY WAS CARRIED OUT BY A SIMPLE MODEL EXPERIMENT. THE RESULTS OF THE EXPERIMENT MADE IT CLEAR THAT COMPARED TO MACHINING, IN GRINDING ALL VALUES OF BASIC FACTORS INCLUDING INTERFERENCE DEPTH OF CUTTING EDGE AND WORKPIECE, CUTTING SPEED, CUTTING EDGE CONDITION, ETC. ARE IN THE DIRECTION OF REDUCING THE CUTTING FORCE RATIO. MOREOVER, THE RESULTS SHOWED THAT THE FORCE RATIO IN GRINDING IS CONTROLLED BY THE PRODUCT OF THE INTERFERENCE LENGTH AND THE MAXIMUM INTERFERENCE DEPTH PER CUTTING EDGE OF ABRASIVE GRAIN.