•Classification test results of the condition of tool blades on a multi-tool head were presented.•Signals of the mining power by sharp and blunt mining tools were recorded.•The observed data were transformed into the probability density functions for two groups of ripping tools.•The probability density functions differ in almost all tested power ranges. In the article, the ripping tools wear in the process of concrete cutting is investigated. Data were observed as signals of mining power of sharp and blunt tools. Using nonparametric estimates combined with the recent approach of a functional data analysis, it is possible to statistically distinguish between the two knife states in terms of their wear.