## 4 The Results of the Experimental Studies
Reporting cuttings were made from the surface (pre-formed) typical for a staggered- cutting pattern. The parameters of the rock-breaking mechanism of the samples by staggered cuttings were analyzed using three oscilloscope waveforms obtained under equal conditions (see Figure 5c). The average value of the cutting force was \(P_{zs}\) = 2564.8 N, the specific energy costs of the rock-breaking mechanism of the potash mass by staggered cuttings was \(H_{us}\) = 1.72 kW\(\cdot\)h/m\({}^{3}\), which corresponds to the results obtained by the authors of the paper [10] during similar studies. There is an isolated surge of the spectrum in the Figure 5d, at a frequency of 3 Hz, which characterizes the frequency of the formation of a large cleavage in the cutting. The value of the root-mean-square deviation of the cutting force during the potash ore cutting sample by the staggered cuttings at \(h\) = 10 mm was \(\sigma_{cs}\) = 1045.8 N.  
The results of the analysis of grain-size distribution of the potash ore separated from the destroyed block by staggered cuttings (see Table 1) show that the implementation of a staggered cutting pattern allows mildly reducing the number of small fractions of \"\(-\)0.25\" size, which are hard to enrich, in the rock chips in comparison with the cutting from a leveled surface method (from 3.69% to 2.94%). The study of the rock-breaking mechanism of potash ore was carried out according to a cross pattern with a cutting step of \(t\) = 35 mm and a cutting depth in relation to the layer of previous cuttings \(h_{c}\) = 5 mm (the total thickness of the cleavage was \(h\) = 10 mm). Reporting cuttings were made from the surface (pre-formed) typical for a cross-cutting pattern. Propulsion parameters of the rock-breaking mechanism of the samples by cross-cutting were analyzed using three oscilloscope waveforms (Figure 5d) obtained under equal conditions. The average value of the cutting force was \(P_{zc}\) = 1910 N, the root-mean-square deviation of the cutting force was \(\sigma_{cc}\) = 1045.8 N, the specific energy costs of the rock-breaking mechanism of the potash mass by cross-cutting was \(H_{wc}\) = 1.46 kW\(\cdot\)h/m\({}^{3}\). There are isolated surges of the spectrum in the Figure 5f, at frequencies of 3 Hz and 8 Hz. The formation of large cleavages of a stable shape is happening at a frequency of 3 Hz, small intermediate cleavages are formed at a frequency of 8 Hz. The grain-size distribution of the destruction products of the ore block by cross-cutting is presented in Table 1. A summary of the load-bearing and energy characteristics of the process of potash ore cutting with a single cutter for each experiment is given in Table 2.  
The relative error of the experimental data does not exceed 10%. Therefore, the decrease in specific energy costs of the cross-cutting process with the cutting parameters \(b_{c}\) = 10 mm, \(h\) = 10 mm, \(t\) = 35 mm in comparison with the staggered pattern is:  
\[\left(1-\frac{H_{wc}}{H_{ws}}\right)\cdot 100\%=\left(1-\frac{1.46}{1.72} \right)\cdot 100\%=15\%, \tag{9}\]  
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Cut Number**} & \multicolumn{2}{c}{**Cuttings from a Leveled Surface**} & \multicolumn{2}{c}{**Staggered Cuttings**} & \multicolumn{3}{c}{**Cross Cuttings**} \\ \cline{2-10}  & \(P_{zl}\) & \(\sigma_{cl}\) & \(H_{ul}\) & \(P_{zs}\) & \(\sigma_{cs}\) & \(H_{ws}\) & \(P_{zc}\) & \(\sigma_{cc}\) & \(H_{wc}\) \\ \hline
1 & 2510.3 & 1061.6 & 3.80 & 2677.1 & 1313.5 & 1.70 & 1850.1 & 1051.9 & 1.43 \\
2 & 2430.8 where \(H_{\rm{acc}}\)--specific energy costs of the rock-breaking mechanism of the sample by cross cutting, \(H_{\rm{acc}}\) = 1.46 kW\(\cdot\)h/m\({}^{3}\); \(H_{\rm{loss}}\)--specific energy costs of the rock-breaking mechanism of the sample by staggered cutting, \(H_{\rm{ss}}\) = 1.72 kW\(\cdot\)h/m\({}^{3}\).