. 2010 Apr 7;10(4):3373–3388. doi: 10.3390/s100403373

Table 3.

Smart sensor tool-wear area estimation errors for different machining experiments.

Experiment	*Feed rate f (mm/rev)*	Depth of cuta_p(mm)	*Cutting speed v_c* (m/min)**	Current and Vibration based estimation absolute error (mm²)
Experiment	*Feed rate f (mm/rev)*	Depth of cuta_p(mm)	*Cutting speed v_c* (m/min)**	Mean (μ)	Standard deviation (σ)
1	0.3333	1.5	72	0.0053	0.0036
2	0.2778			0.0396	0.0533
3	0.2222			0.0599	0.0503
4	0.1667			0.0671	0.0631
5	0.1111			0.0650	0.0796
6	0.3333	2.5		0.0719	0.0504
7		2.0		0.0228	0.0255
8		1.5		0.0053	0.0036
9		1.0		0.0575	0.0663
10		0.5		0.0701	0.0902