Optimization of Surface Roughness in Drilling Medium-Density Fiberboard with a Parallel Robot

Table 8

Estimated values and confirmation test results by Taguchi technique and regression values.

Level	Taguchi method			Linear regression method			Quadratic regression method
	Exp.	Pred.	Error (%)	Exp.	Pred.	Error (%)	Exp.	Pred.	Error (%)
Ra (μm)
A1B3C1 (optimum)	2.122	2.012	5.18	2.122	1.964	7.44	2.122	2.201	3.72
A2B2C3 (random)	4.758	4.834	1.59	4.758	4.935	3.72	4.758	4.820	1.30