In this paper, a mathematic relationship between space position of gage surface and bit size, and other design parameters is derived on the basis of geometry of cone bit.
本文从新的几何关系出发，推导了牙轮背锥规径圆空间位置与钻头直径及其它设计参数的数学关系。
2
New type PDC cutters and heavyset gage design promote longer bit life in hard and abrasive formations.
新型切削齿及高密度保径布齿提高钻头在硬研磨性地层中的使用寿命。
3
The overflow tank level and the speed of both the role of Chip can be changed by changing the factors such as the nozzle inlet pressure, drill gage width, nozzle diameter of the PDC bit.