Detecting Safety Zone Drill Process Parameters for Uncoated HSS Twist Drill in Machining GFRP Composites by Integrating Wear Rate and Wear Transition Mapping

Table 3

Normalised wear rate data of 10 mm HSS drill.

Spindle speed (rpm)	Drill feed (mm/rev)	Average weight difference (gms)	Machining time (min)	Weight lost in unit time (g/min)	Wear rate (mm^3/min)	Normalised wear rate	log(norm. wear rate)
1200	0.1	0.1379	10	0.01379	1.5905421	0.000450032	−3.34676
1300	0.1	0.1807	8	0.0225875	0.2605248		−4.13245
1400	0.1	0.2167	7.4285714	0.029171154	0.33646083		−4.02137
1500	0.1	0.2459	6.9333333	0.035466346	0.40906974	0.000115743	−3.9365
1600	0.1	0.2683	6.5	0.041276923	0.47608908	0.000134706	−3.87061
1700	0.1	0.2841	6.1176471	0.046439423	0.53563348	0.000151553	−3.81943
1800	0.1	0.293	5.7777778	0.050711538	0.58490817	0.000165495	−3.78121
1200	0.15	0.1057	5.7777778	0.018294231	0.21100612		−4.22401
1300	0.15	0.1606	5.3333333	0.0301125	0.34731834		−4.00757
1400	0.15	0.2087	4.952381	0.042141346	0.48605936	0.000137527	−3.86161
1500	0.15	0.25	4.6222222	0.054086538	0.62383551	0.000176509	−3.75323
1600	0.15	0.2846	4.3333333	0.065676923	0.7575193	0.000214334	−3.66891
1700	0.15	0.3124	4.0784314	0.076598077	0.88348416	0.000249975	−3.6021
1800	0.15	0.3334	3.8518519	0.086555769	0.99833644	0.000282472	−3.54903
1200	0.2	0.0849	4.3333333	0.019592308	0.22597817		−4.19424
1300	0.2	0.1519	4	0.037975	0.43800461	0.00012393	−3.90682
1400	0.2	0.2121	3.7142857	0.057103846	0.65863721	0.000186356	−3.72966
1500	0.2	0.2655	3.4666667	0.076586538	0.88335108	0.000249937	−3.60217
1600	0.2	0.3121	3.25	0.096030769	1.10762133	0.000313393	−3.50391
1700	0.2	0.352	3.0588235	0.115076923	1.32730015	0.000375549	−3.42533
1800	0.2	0.3852	2.8888889	0.133338462	1.5379292	0.000435145	−3.36137
1200	0.25	0.0755	3.4666667	0.021778846	0.25119776		−4.14829
1300	0.25	0.1545	3.2	0.04828125	0.55687716	0.000157564	−3.80254
1400	0.25	0.2268	2.9714286	0.076326923	0.88035667	0.00024909	−3.60364
1500	0.25	0.2923	2.7733333	0.105396635	1.21564746	0.000343958	−3.46349
1600	0.25	0.3511	2.6	0.135038462	1.55753704	0.000440693	−3.35586
1700	0.25	0.4031	2.4470588	0.164728365	1.89998115	0.000537585	−3.26955
1800	0.25	0.4483	2.3111111	0.193975962	2.23732366	0.000633033	−3.19857
1200	0.3	0.774	2.8888889	0.267923077	3.09023157	0.000874357	−3.05831
1300	0.3	0.1686	2.6666667	0.063225	0.72923875	0.000206332	−3.68543
1400	0.3	0.2529	2.4761905	0.102132692	1.17800106	0.000333306	−3.47716
1500	0.3	0.3305	2.3111111	0.143004808	1.64942108	0.000466691	−3.33097
1600	0.3	0.4014	2.1666667	0.185261538	2.13681129	0.000604594	−3.21854
1700	0.3	0.4655	2.0392157	0.228274038	2.63291855	0.000744964	−3.12786
1800	0.3	0.5228	1.9259259	0.271453846	3.13095555	0.00088588	−3.05263