Table 9. Roughness evaluation for different plates (in µm).

Plate	Manufacture	Coated	Direction	R a	R z	R z /R a
1	Milling & Grinding	N	Long	0.15	1.03	6.87
1	Milling & Grinding	N	Long	0.27	2.64	9.78
1	Milling & Grinding	Y	Long	0.16	1.27	7.94
1	Milling & Grinding	Y	Cross	0.13	0.91	7.00
2	Laser	N	Long	0.41	2.75	6.71
2	Laser	N	Cross	0.38	2.70	7.11
3	Laser	N	Long	1.24	7.52	6.06
3	Laser	N	Cross	1.20	7.25	6.04
4	Laser	N	Long	2.50	16.80	6.72
4	Laser	N	Cross	2.54	16.46	6.48
5	Laser	N	Long	5.88	35.46	6.03
5	Laser	N	Cross	5.76	33.66	5.84