Rheonomic phenomenon shrinkage of holes drilled in fibreglass and carbon fibre-reinforced polymer composites

Table 3 Results of error evaluation

Tool usage parameters	Tool	S	\( \overline{x} \), мм	x _∗, мм	t	t _n(0, 99)	Rejection condition
S_m = 50 mm/min n = 10,000 rev/min	Diamond drill	0.008667	10.077	10.090	1.499	3.54	No
S_m = 50 mm/min n = 10,000 rev/min	HAM 380 drill	0.0113	10.0355	10.060	2.168	3.54	No
S_m = 75 mm/min n = 15,000 rev/min	Diamond drill	0.0229	10.053	10.02	1.440	3.54	No
S_m = 75 mm/min n = 15,000 rev/min	HAM 380 drill	0.015	10.040	10.065	1.666	3.54	No
S_m = 300 mm/min n = 20,000 rev/min	Diamond drill	0.0123	10.051	10.03	1.707	3.54	No
S_m = 300 mm/min n = 20,000 rev/min	HAM 380 drill	0.00707	10.023	10.01	1.838	3.54	No