Arabian Journal of Geosciences
(2020) 13:532
https://doi.org/10.1007/s12517-020-05380-0
ORIGINAL PAPER
Determination of appropriate cutting parameters depending
on surface roughness by Taguchi method in milling of marbles
Erkan Özkan 1
&
Oğuzhan Öz 2
Received: 15 August 2019 / Accepted: 28 April 2020
# Saudi Society for Geosciences 2020
Abstract
Determining cutting parameters in marble machining based on computer-controlled machine (CNC) is important for product
quality. The aim of this study was to use the Taguchi experiment design method to select machining parameters to improve
product surface quality in CNC milling of marbles. Experimental studies were conducted with a 6-mm-diameter cutting edge on
six metamorphic rocks. Experiments were performed using the Taguchi experimental design method (L9 orthogonal array). The
S/N (signal/noise) ratio based on “the lower the better” approach was calculated separately for each marble sample to determine
appropriate machining parameters. Statistically significant and effective machining parameters were determined using variance
analysis depending on the lowest roughness value. Results show that the parameters of depth and feed rate have the greatest effect
on surface roughness in the machining of marbles.
Keywords Marble . Taguchi . Milling . Roughness
Introduction
Marble has been produced in Turkey since the Neolithic era as
it has the largest marble deposits in the world (Herz 1988).
Diamond wire cutting and chain saw machines are used for
block production in marble quarries (Özkan et al. 2015).
Blocks from marble quarries and products (slabs, plates, tablets, etc.) cut with gang saw and S/T (block cutting machines
with circular diamond blade) machines in marble factories are
used to produce decorative products (sculptures, carvings,
reliefs, frescoes, etc.) in CNC vertical machining centers.
Marble is cut deep on the x and z axis (length × depth) to
produce plates with block cutting machines. Differently,
CNC cutting requires a small depth cut on the x, y, and z axis,
and precise machining (length × width × depth) (Sarıışık and
Özkan 2016, 2017).
Responsible Editor: Murat Karakus
* Erkan Özkan
erkanozka@gmail.com
1
Faculty of Engineering, Department of Mining, Afyon Kocatepe
University, 03200ANS Campus, Afyonkarahisar, Turkey
2
Afyonkarahisar, Turkey
Milling is a basic machining process commonly used in
the manufacturing industry, especially in metalworking
(Altintas 1994; Lee and Lin 2000). Basic cutting parameters
(cutting speed, feed rate, and depth parameters) affect the
surface roughness of metal materials in CNC milling (Lou
et al. 1998). The Taguchi experimental design method uses
fewer experiments than full factorial test design to solve the
effect of basic cutting parameters on surface roughness
(Ghani et al. 2004). Many researchers have, therefore, used
the Taguchi method in milling metals in order to minimize
surface roughness depending on basic cutting parameters
(Benardos and Vosniakos 2002; Fratila and Caizar 2011;
Joshi and Kothiyal 2012; Ghani et al. 2004; Zhang et al.
2007; Maiyar et al. 2013; Kıvak 2014; Quintana and
Ciurana 2011).
In milling under ideal conditions, surface roughness is a
function of basic cutting parameters and tool geometry.
However, under real conditions, cutter and workpiece vibrations, machining vibrations, or chip adhesion (built-up edge)
affect surface quality. Surface roughness defines the machined
surface geometry and depends on the machining parameters
and the surface texture. Surface roughness formation is very
dynamic, complex, and process-dependent. Consequently,
surface roughness directly affects design quality and production cost (Kline et al. 1982a; Kline et al. 1982b; Smith and
Tlusty 1993; Alauddin et al. 1995; Benardos and Vosniakos
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Table 1
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(2020) 13:532
Names and numbers of standards used in experiments
Standard names
EN Standard No.
Determination of knoop hardness
Determination of real density and apparent density, and of total open porosity
Determination of unaxial compressive strength
Determination of elemental composition by XRF
Determination of water absorption at atmospheric pressure
Determination of flexural strength under constant moment
Determination of frost resistance
Determination of abrasion resistance
14205:2003 (European Standards Institute (EN) 2003)
1936: 2006 (European Standards Institute (EN) 2006a)
1926: 2006 (European Standards Institute (EN) 2006b)
15309:2007 (European Standards Institute (EN) 2007)
13755:2008 (European Standards Institute (EN) 2008a)
13161: 2008 (European Standards Institute (EN) 2008b)
12371:2010 (European Standards Institute (EN) (EN) 2010)
14157 :2017 (European Standards Institute (EN) 2017)
XRF X-ray fluorescence
2002; Benardos and Vosniakos 2003; Lamikiz et al. 2004;
Wang et al. 2010; Quintana and Ciurana 2011).
Studies have examined the cutting forces and specific energy parameters related to the machinability of marbles and
limestones on CNC with diamond-coated inserts and carbide
inserts (Polini and Turchetta 2004; Turchetta et al. 2009;
Turchetta 2012; Sarıışık and Özkan 2016; Sarıışık and
Özkan 2017; Sarıışık and Özkan 2018). There are, however,
no studies examining the quality measurement (Gálos and
Gyurika 2014), average chip rate (Gyurika and Szalay
2015), chip breaking (Gyurika 2018), and effect of cutting
parameters on surface roughness (Gyurika and Szalay 2019)
in CNC milling of granite edges, and effect of surface roughness on CNC milling parameters with carbide tools. Carbidecoated CNC milling is widely used in the natural stone
industry.
Wear in cutting tools changes the surface roughness of
metals. Appropriate cutting parameters play a role in reducing
cutting tool wear, achieving the desired surface roughness,
and improving cutting performance. Energy consumption
Table 2
and tool wear are two important factors that affect operating
costs in the machining of metals (Benardos and Vosniakos
2003; Ghani et al. 2004; Quintana and Ciurana 2011). Our
experimental studies showed that if carbide tools start to wear,
they cannot cut marbles, and break. Due to different properties
and grain sizes of metamorphic origin marbles, processing
parameters change. The selection of machining parameters
affects tool life. In the machining of marbles, sawdust is in
the form of grain and is removed with water, which prolongs
tool life.
Homogeneous, crack-free, and monochrome marbles
were used as samples to make sense of surface roughness results. Based on cutting parameters, a Taguchi test
was designed and used to measure surface roughness
values (Ra). Planners and natural stone manufacturing
companies can use those cutting parameters for cost
analysis and milling tool operation programs in marbles.
This study suggests that manufacturers use the machining parameters that provide minimum surface roughness
in CNC-machined marbles.
Characteristics and petrographic definitions of samples used in experiments
C crack, Po pore, F fossil. Geological rock-color chart (2009)
(2020) 13:532
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M2
M3
M5
M4
Calcite Dolomite
M6
M1
Fig. 1 Cross sections of samples. CAL, calcite; DOL, dolomite
Table 3
Chemical characteristics of samples
Natural
rock
Lol
(%)
Na2O
(%)
MgO
(%)
Al2O3
(%)
SiO2
(%)
P2O5
(%)
SO3
(%)
Cl
(%)
K2O
(%)
CaO
(%)
MnO
(%)
Fe2O3
(%)
SrO
(%)
F
(%)
M1
M2
M3
M4
M5
M6
44.0
43.6
47.2
43.0
43.6
44.3
0.011
0.015
0.018
0.020
0.007
0.029
0.177
0.760
14.4
0.348
0.327
0.875
0.129
0.100
0.049
0.048
0.020
0.047
0.126
0.090
0.062
0.065
0.030
0.054
0.006
0.004
0.010
0.003
0.010
0.002
0.007
0.009
0.011
0.008
0.004
0.014
0.004
0.006
0.008
0.008
0.014
0.026
0.019
0.006
0.003
-
55.4
55.2
38.1
56.5
55.9
54.6
0,008
-
0.029
0.065
0.018
0.030
0.037
0.028
0.008
0.019
0.016
0.020
0.017
0.029
0.093
0.052
-
Lol loss on ignition
Table 4
Physical and mechanical properties of samples
Natural rock
AD (kg/m3)
OP (%)
WA (%)
HK
HS
UCS (MPa)
FS (MPa)
AR (cm3/50 cm2)
M1
M2
2686
2653
0.24
0.22
0.10
0.06
141.15
144.18
48.9
46.3
68.74
94.12
14.81
13.31
25.41
20.45
M3
M4
M5
M6
2673
2710
2650
2664
0.12
0.33
0.26
0.21
0.10
0.20
0.12
0.07
157.33
140.43
143.90
145.28
49.1
42.5
44.1
50.2
69.04
58.84
66.85
76.20
10.89
5.23
10.54
21.37
29.60
32.36
21.09
14.77
AD apparent density, OP open porosity, HK knoop hardness, HS shore hardness, WA water absorption, UCS uniaxial compressive strength, FS flexural
strength, AR abrasion strength
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Fig. 2 CNC stone milling
machine (a general view, b
Maltese cross system top view,
and c Maltese cross system side
view)
In CNC machinability, the processing parameters as well as
the crystal structures and grain dimensions of natural stones
should be taken into account in order to achieve surface quality in natural stones.
Taguchi method
The Taguchi method is a statistical method that allows for
selection of experimental design based on well-defined parameters in a working environment. This method is based on
orthogonal array used to combine machining parameters that
reduce and affect process variability. The greatest advantage
of this method is that it performs a few experiments instead of
all possible setting of experiments and therefore provides time
and cost savings. S (signal value) is the actual value of the
Table 5
system and N (noise factor) is the share of unwanted factors in
the measured value. A series of statistics, referred to as the S/N
ratio defining performance characteristics, are used in a
Taguchi experimental design to reduce system variation. The
S/N ratio approximates characteristic values to target values
and ensures minimum deviation. The performance characteristic analysis in the S/N ratio has three categories: (1) Nominal
is the best, (2) Larger is the better, and (3) Smaller is the better.
The appropriate level of a process parameter for each of these
categories is the level that results in the maximum value of the
S/N ratio (Dehnad 1989; Taguchi et al. 2004; Roy 2010;
Kıvak 2014).
Cutting parameters were determined to use to minimize
surface roughness. Equation 1 is used for calculations.
S
1
¼ −10log ∑ni¼1 y2i
ð1Þ
N
n
Technical features of CNC marble vertical processing machine
Technical feature
Unit
Value
Spindle motor
Number of axis
Motor speed
Processing speed
Motor × axis feed speed
Coolant
Automatic number of teams
kW
Number
rpm
rpm
mm/min
l/min
Number
9
4
24,000
24,000
80,000
3
8
Fig. 3 Milling tool for stone cutting
(2020) 13:532
Arab J Geosci
Table 6 Technical
features of mill cutting
tool
Page 5 of 10 532
Technical feature
Value
Code
Cutting tool diameter
Stem diameter
Cutting length
End length
MFR-6
6 mm
6 mm
25 mm
63 mm
Milling end
Edge number
Helix angle
36,657
4
25°
Table 8
Exp. No.
The steps for selecting the appropriate parameter in the
Taguchi experimental design are as follows: (1) defining performance characteristics and select machining parameters, (2)
determining the number of levels for machining parameters
and the possible interactions between machining parameters,
(3) determining the orthogonal array and assign machining
parameters to it, (4) conducting experiments based on orthogonal arrangement, (5) calculating total loss function and S/N
ratio, (6) using the multiple-response S/N ratio and variance
analysis (ANOVA) to analyze experimental results, and (7)
selecting levels of appropriate machining parameters (Nalbant
et al. 2007).
T1
T2
T3
T4
T5
T6
T7
T8
T9
Experimental layout using an L9 orthogonal array
Factor level
A
B
C
V
f
a
1
1
1
2
2
2
3
3
3
1
2
3
1
2
3
1
2
3
1
2
3
2
3
1
3
1
2
169
169
169
188
188
188
207
207
207
2000
2500
3000
2000
2500
3000
2000
2500
3000
1
2
3
2
3
1
3
1
2
at least 99.7% dolomite mineral consisting of 38.1% CaO and
14.4% MgO. Table 3 shows the chemical analysis of the samples. Shore hardness was carried out in the Accredited Natural
Stone Analysis Laboratory (DAL) of the Mining Engineering
Department of the Faculty of Engineering of Afyon Kocatepe
Experimental methods
Rocks used in experimental studies
Six types (Afyon White, Bursa Kemalpasa White, Marmara
White, Mugla White, Usak White, and Kutahya Gray) of
polished metamorphic rock samples of 300 × 300 × 20 mm
were used in the experiments. Table 1 presents the physicomechanical tests and standards of the samples. Table 2 shows
the mineralogical and petrographical descriptions of the samples, while the grain sizes, textures, and minerals of the samples are shown in the thin sections in Fig. 1. Data were analyzed using X-ray fluorescence method. The samples were
composed of at least 98.8% calcite minerals ranging from
54.60 to 56.50% with CaO. Marmara White is composed of
Table 7
Factors and levels used in experiments
Factor
Cutting feed
Feed rate
Depth of cut
Symbol
V
f
a
Unit
m/min
mm/min
mm
Code
A
B
C
Level
1
2
3
169
2000
1
188
2500
2
207
3000
3
Assigned factor value
Fig. 4 Machining process plan
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Fig. 5 Milling of samples and
surface roughness measurements
(a leveling of the surface, b
surface treatment, c machined
surface appearance, and d surface
roughness measurement)
University. Table 4 shows the physical and mechanical properties of the samples.
Milling tests and surface roughness measurements
Milling was performed at the CNC stone vertical machining center in the Laboratory of the Mining
Engineering Department of the Engineering Faculty of
Afyon Kocatepe University. Figure 2 and Table 5 show,
respectively, the image and technical features of the
CNC stone vertical machining center. Figure 3 and
Table 6 show, respectively, the image and technical features of the carbide milling bit used in the machining
experiments. A new carbide milling tool was used to
level the marbles and process the marble samples.
Table 9
V (m/min)
169
169
169
188
188
188
207
207
207
Alpham program was used in modeling and assigning machining parameters. The experimental study was designed in
three dimensions as three squares of 40 × 40 mm on a marble
of 300 × 300 × 20 mm. The machining parameters were 1, 2,
and 3 mm of depths; 169, 188, and 207 m/min of cutting
speeds; and 2000, 2500, and 3000 mm/min of feed rates.
The Taguchi method was used to determine appropriate
machining parameters. Cutting depth, cutting speed, and progress (control parameters) are designed at 3 different levels.
Taguchi’s “smaller is the better” approach was used to appropriate the machining parameters of surface roughness. Table 7
shows the L9 orthogonal array of the Taguchi method. Table 8
shows the L9 orthogonal array applied according to the machining parameters.
The Taguchi method uses the S/N ratio to analyze performance criteria. The objective of the S/N ratio is to determine
Experimental results for Ra and S/N ratio
f (m/min)
2000
2500
3000
2000
2500
3000
2000
2500
3000
a (m/min)
1
2
3
2
3
1
3
1
2
M1
M2
M3
M4
M5
M6
Ra
S/N
Ra
S/N
Ra
S/N
Ra
S/N
Ra
S/N
Ra
S/N
6.10
7.79
7.86
8.62
11.69
8.72
8.70
9.20
8.92
− 15.70
− 17.83
− 17.91
− 18.71
− 21.35
− 18.81
− 18.79
− 19.28
− 19.01
6.01
5.77
5.85
5.60
5.76
5.55
6.29
6.57
5.96
− 15.58
− 15.23
− 15.34
− 14.96
− 15.22
− 14.88
− 15.98
− 16.35
− 15.50
3.65
3.54
3.74
4.12
4.25
4.32
4.65
4.54
4.91
− 11.26
− 10.98
− 11.45
− 12.30
− 12.56
− 12.71
− 13.35
− 13.14
− 13.82
6.90
6.44
6.34
7.06
7.14
6.44
7.50
7.46
6.92
− 16.77
− 16.18
− 16.04
− 16.98
− 17.07
− 16.17
− 17.50
− 17.46
− 16.81
4.84
5.53
5.57
5.93
6.24
6.81
6.66
7.30
6.82
− 13.70
− 14.86
− 14.92
− 15.46
− 15.90
− 16.66
− 16.47
− 17.26
− 16.68
6.15
5.83
6.09
6.79
7.66
6.98
7.39
7.34
7.43
− 15.78
− 15.32
− 15.70
− 16.64
− 17.69
− 16.88
− 17.38
− 17.31
− 17.42
Arab J Geosci
Table 10
(2020) 13:532
Page 7 of 10 532
Response table mean S/N ratio for Ra factor
M1 Level (Ra)
1
2
3
Delta
Rank
V (A)
-18.50
-19.52
-19.36
0.87
3
Appropriate parameter A1:B1:C1
M3 Level (Ra)
V (A)
1
-12.37
2
-12.37
3
-12.46
Delta
0.09
Rank
3
Appropriate parameter A1:B2:C1
M5 Level (Ra)
V (A)
1
-15.88
2
-15.67
3
-15.77
Delta
0.21
Rank
3
Appropriate parameter A2:B1:C1
f (B)
-18.30
-19.49
-18.58
1.19
2
a (C)
-17.15
-19.63
-19.03
1.91
1
f (B)
-12.31
-12.23
-12.67
0.44
2
a (C)
-11.23
-12.53
-13.44
2.21
1
f (B)
-15.22
-16.01
-16.09
0.88
2
a (C)
-14.50
-16.01
-16.81
2.31
1
the appropriate parameter with minimum deviation. In this
study, the S/N ratio was used to determine appropriate cutting
parameters against minimum surface roughness. The closest
cutting parameters for minimum surface roughness (smaller S/
N ratios and levels) were calculated using Eq. 1.
In the first stage, surface leveling operations were performed. In the second stage, pocket milling was performed
according to the machining parameters. In the third stage,
surface leveling operations were performed on sections other
than the already processed ones. Figure 4 presents the image
of the machining steps. The three-parameter and three-level
Taguchi experimental design yielded nine surfaces (L9 orthogonal array). The roughness of those surfaces was measured using a surface roughness measuring instrument
(Mahr-Perthometer M2). The surfaces were divided into 4
equal squares and 36 measurements were made for each
square. Figure 5 shows the images of the machining steps
and surface roughness measurement.
Results and discussion
Tables 9 and 10 show the S/N ratios relative to each level
of the machining parameters and the mean S/N response
for Ra, respectively (Öz 2018). The greatest values in
Tables 9 and 10 indicate the parameter levels with the
lowest probability of variance to achieve the desired Ra
values. The parameter with the highest delta value for
M2 Level (Ra)
1
2
3
Delta
Rank
V (A)
-15.61
-15.23
-15.52
0.38
2
Appropriate parameter A2:B3:C2
M4 Level (Ra)
V (A)
1
-16.81
2
-16.66
3
-16.88
Delta
0.22
Rank
3
Appropriate parameter A2:B3:C1
M6 Level (Ra)
V (A)
1
-16.66
2
-16.46
3
-16.93
Delta
0.46
Rank
2
Appropriate parameter A2: B3: C1
f (B)
-15.51
-15.60
-15.25
0.36
3
a (C)
-15,39
-15,03
-15,95
0,92
1
f (B)
-17.09
-16.91
-16.35
0.74
2
a (C)
-16.34
-16.75
-17.26
0.92
1
f (B)
-16.60
-16.78
-16.67
0.18
3
a (C)
-15.60
-17.08
-17.38
1.77
1
each level of samples has the greatest effect on roughness.
Table 10 shows the rank of effect, indicating that the
possible combination of parameters is A1:B1:C1 to obtain
an Ra value for the sample M1. Figure 6 shows the Ra S/
N response graphs of the samples. The highest slopes in
the graphs indicate the effectiveness levels of parameters.
Describing the effects of parameters on quality characteristics more clearly and numerically allows us to select
parameter levels more precisely. In this study, analysis
of variance was used to determine parameter effectiveness
rates. Table 11 shows the analysis results. In variance
analysis, whether a parameter has an effect on response
is determined by P (significance/probability) value. P <
0.05 (5% significance value) at the 95% level of confidence suggests the effect of the parameter on the response. The rightmost column of Table 10 shows the contribution (%) of each factor to total variation. Since F
values in depth factor are greater than F0,05;2;8 = 4.46 in
variance analysis based on F hypothesis, it has an effect
on Ra surface roughness. The most effective parameter for
Ra for the samples M2, M3, M5, and M6 is 72.48%,
94.29%, 80.39%, and 89.18% depth, respectively
(Table 10). However, depth, cutting speed, and feed rate
have an effect of 55.01%, 21.42%, and 22.96% in the
sample M1, respectively. Depth and feed rate have an
effect of 53.56% and 37.56% in the sample M4, respectively. Analysis of variance shows that cutting speed has
the least effect on Ra roughness.
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Page 8 of 10
M1
Data Means
V
M2
Data Means
f
V
a
f
a
-15,0
Mean of S/N ratios
-17,5
Mean of S/N ratios
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Arab J Geosci
-18,0
-18,5
-19,0
-15,2
-15,4
-15,6
-15,8
-19,5
-16,0
169
188
207
2000
2500
3000
1
2
169
3
188
207
f
a
V
-11,0
3000
1
2
3
f
a
-16,2
Mean of S/N ratios
Mean of S/N ratios
2500
M4
Data Means
M3
Data Means
V
2000
-11,5
-12,0
-12,5
-13,0
-16,4
-16,6
-16,8
-17,0
-17,2
-13,5
169
188
207
2000
2500
3000
1
2
3
169
188
207
f
a
3000
1
2
3
V
f
a
-15,5
Mean of S/N ratios
-14,5
Mean of S/N ratios
2500
M6
Data Means
M5
Data Means
V
2000
-15,0
-15,5
-16,0
-16,5
-17,0
-16,0
-16,5
-17,0
-17,5
169
188
207
2000
2500
3000
1
2
3
169
188
207
2000
2500
3000
1
2
3
Fig. 6 The graphic of mean of S/N ratios versus factor levels (Ra)
Conclusion
First, appropriate machining parameters were determined
using the Taguchi experimental design method as a result of
milling six types of marbles based on CNC parameters.
Second, variance analysis was carried out to calculate the effects (%) of statistically significant machining parameters.
Some results were obtained for sample marbles and CNC
machine tool working conditions.
As described in this article, Taguchi’s robust orthogonal
array design method is suitable for analyzing the surface
roughness problem of marbles. The Taguchi method is a systematic, simple, and efficient method that can be used to analyze surface roughness during milling and to find the most
appropriate parameter with experimental design. The combination of the factorial design of 3 parameters and 3 levels
required 27 experiments. However, the L9 Taguchi orthogonal array reduced it to 9. The preparation time required for
Arab J Geosci
Table 11
Ra
V
f
a
Error
Total
(2020) 13:532
Page 9 of 10 532
Results of the analysis of variance for Ra
M1
M2
M3
M4
M5
M6
% Effect
F
% Effect
F
% Effect
F
% Effect
F
% Effect
F
% Effect
F
21.42
22.96
55.01
0.61
100
35.49
38.05
91.18
13.29
11.15
72.48
3.08
100
4.30
3.60
23.45
0.21
4.2
94.29
1.29
100
0.15
3.23
72.64
3.18
37.56
53.56
5.70
100
0.55
6.58
9.39
0.65
13.51
80.39
5.45
100
0.11
2.47
14.74
5.46
0.82
89.18
4.54
100
0.17
1.20
19.64
appropriate parameter selection in CNC machining of marbles
has been minimized and machining performance and product
quality have been improved. According to the graphs of the
mean S/N ratios, the appropriate parameter combinations for
Ra are A1:B1:C1, A2:B3:C2, A1:B2:C1, A2:B3:C1,
A2:B1:C1, and A2:B3:C1 for the samples M1, M2, M3,
M4, M5, and M6, respectively.
Analysis of variance was used to determine the effects of
parameters on Ra. The results show that the most effective
parameter for Ra for the samples M2, M3, M5, and M6 is
72.48%, 94.29%, 80.39%, and 89.18% depth, respectively.
However, depth, cutting speed, and feed rate have an effect
of 55.01%, 21.42%, and 22.96% in the sample M1, respectively. Depth and feed rate have an effect of 53.56% and
37.56% in the sample M4, respectively. Depth generally has
an effect on surface quality. Low depth (1 mm) results in the
best surface quality. Furthermore, the less the depth, the better
the surface quality. The shape, clamping, and orientation of
the M2 sample’s grains to each other are different compared
with other samples. For this reason, better surface quality results were obtained at a depth of 2 mm.
Marbles differ by surface roughness texture and grain size,
and therefore, it is recommended that future studies use a
larger database.
Acknowledgments We would like to thank the Scientific Research
Committee of Afyon Kocatepe University and Zafer Development
Agency Social Development Financial Assistance Programs for their
support and contributions.
Funding information This study was supported by the Scientific
Research Committee of Afyon Kocatepe University (grant number
17.FEN.BİL.58 and 17.MÜH.04) and by Zafer Development Agency
Social Development Financial Assistance Programs (grant number
TR33/12/ SKMDP/0104).
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