Optimal Approaches for Hard Milling of SKD11 Steel Under MQL Conditions Using SIO₂ Nanoparticles

Table 5

Analysis of variance for surface roughness.

Source	DF	Adj-SS	Adj-MS	F-value	-value	C%
Model	14	0.082000	0.005857	6.15	0.002
Linear	4	0.074246	0.018562	19.50	≤0.001	79.47
C	1	0.019734	0.019734	20.73	0.001	21.12
V	1	0.004513	0.004513	4.74	0.050	4.83
ap	1	0.002156	0.002156	2.26	0.158	2.31
f	1	0.047844	0.047844	50.26	≤0.001	51.2
Square	4	0.006350	0.001587	1.67	0.222
C C	1	0.003143	0.003143	3.30	0.094
V V	1	0.000358	0.000358	0.38	0.551
ap ap	1	0.000003	0.000003	0.00	0.955
f f	1	0.002846	0.002846	2.99	0.109
2-Way interaction	6	0.001404	0.000234	0.25	0.952
C V	1	0.000207	0.000207	0.22	0.649
C a p	1	0.000075	0.000075	0.08	0.784
C f	1	0.000008	0.000008	0.01	0.928
V a p	1	0.000790	0.000790	0.83	0.380
V f	1	0.000213	0.000213	0.22	0.644
ap f	1	0.000052	0.000052	0.05	0.819
Error	12	0.011423	0.000952	—	—
Total	26	0.093424	—	—	—
R-sq = 87.77%