Research on New Helical-Conical Grinding Method for PCB Drill
A new grinding method for PCB drill-helical-conical grinding method which is combined helical method and conical method is introduced in this paper. Compared with conical grinding method, helical-conical grinding method avoids the tail rising problem and improves the clearance angle distribution along with the main cutting edge. The mathematical model of this method is given in this paper.
Chengyong Wang, Ning He, Ming Chen and Chuanzhen Huang
X. H. Zheng et al., "Research on New Helical-Conical Grinding Method for PCB Drill", Advanced Materials Research, Vol. 188, pp. 423-428, 2011