Modeling of Drilling Forces Based on Twist Drill Point Angles Using Multigene Genetic Programming

Table 3

Predicted (bold) and experimental (italic) thrust forces.

Feed (mm/rev)	Speed (rpm)	Diameter (mm)	Point angle	Web thickness (mm)	Pilot hole diameter (mm)	⁢Entire drill thrust; force (N)
0.229	400	15.9	118	2.3	3.2	2247.01	2228.64
0.102	200	15.9	118	2.3	3.2	1279.97	1352.70
0.102	800	15.9	118	2.3	3.2	1157.96	1149.73
0.254	400	12.7	118	2.3	2.8	2001.38	1873.23
0.102	400	9.5	118	1.5	2.4	781.99	811.97
0.178	400	9.5	118	1.5	2.4	1184.69	1131.71
0.178	400	12.7	80	1.9	2.8	1221.16	1376.90
0.102	400	12.7	160	1.9	2.8	1765.58	1893.29
0.102	400	15.9	135	2.3	4.4	997.64	868.69
0.178	400	15.9	135	2.3	4.4	1528.14	1542.99