Table 4.

Signal to noise ratios for wear rate responses.

Smaller is better
Level	Reinforcement (%)	Load (N)	Disc speed (m/s)	Sliding distance (m)
1	34.78	38.87	39.90	35.58
2	36.55	36.17	36.13	35.04
3	37.26	36.38	35.12	37.24
4	38.10	35.28	35.54	38.84
Delta	3.32	3.59	4.78	3.80
Rank	4	3	1	2