通常在切削時,進刀量和创削深度的比值總是小於1。在切削用量的參考書籍中,s/t的最大比值大體等於0.5～0.7。極大多數的有開切削力、创削溫度、和切屑收縮率等等的研究工作,也是在s/t<1的條件下進行的。科列索夫切削法的採用,顯著的擴大了比值s/t的變化範圍。例如:當s=3公厘,t=1公厘時,比值s/t=3;而在另一些场合下,這個數值可能還要大。由於這個緣故,發生了下面的問題,即:那些 When cutting, the ratio of infeed depth to cut depth is always less than one. In the cutting amount of reference books, s / t ratio is generally equal to 0.5 to 0.7. The vast majority of the research work with open cutting force, cutting temperature, and chip shrinkage, etc., are also carried out under the conditions of s / t <1. The adoption of the Koletsov cut significantly widened the range of variation of the ratio s / t. For example, when s = 3 mm and t = 1 mm, the ratio s / t = 3; on other occasions this value may be larger. For this reason, the following problems have occurred, namely: those