*2.3. Material Removal Rate Measurement*

The material removal rate Qm was measured by means of the weight difference of the workpieces, before and after the honing test. Workpieces were weighed with a Kern FCB 3K0.1 scale (Kern &Sohn GmbH, Balingen, Germany).

Qm is defined as the volume of material removed in cm<sup>3</sup> per min and per unit area of abrasive wheel in cm2. Qm in cm/min is calculated as follows (Equation (1)):

$$\text{Qm} = \frac{\text{V}}{\text{S} \cdot \text{t}} \tag{1}$$

where V is removed volume in cm3, S is abrasive surface in cm2 and t is honing time in min.

The removed volume V in cm3 is calculated from the weight W of the workpiece before and after honing (Equation (2)).

$$\mathbf{V} = \frac{\mathbf{W}\mathbf{i} - \mathbf{W}\mathbf{f}}{\rho} \tag{2}$$

where Wi is initial weight of the cylinder in g, Wf is the final weight of the cylinder in g, and ρ is the density of the cylinder in g/cm3.
