7
Moderately Worn Bit: This distribution is highly con-
centrated in the range of smaller particles, with 54 particles
lying in the 100–200mm range and 35 in the 200–300mm
range. The sudden reduction in particle sizes (no particles
above 300mm) suggests that the moderately worn bit gen-
erates more fine particles than coarser and bigger particles.
This tendency towards finer particles suggests more crush-
ing and grinding rather than precise cutting, as occurs when
wear-resistant bits begin to lose their edge.
Completely Worn Bit: The distribution in this test
matrix showcases that the spread progressively approaches
smaller sizes the largest concentration (28 particles) was
found in the 300–400mm range, and then small concentra-
tions in the 200–300mm (20 particles) and 400–500mm
(21 particles) ranges. Such a wider distribution of larger
3
54
35 6 4 0 1 0 1 0 0
0
20
40
60
80
100
120
Particle size (mm)
cumulative cumulative %
3
54
35
6 4 0 1 0 1 0 0
Particle size (mm)
Figure 10. Particle size distribution of moderately worn bit
1
7
20
28
21
7
7 3 5 3 5
0
20
40
60
80
100
120
Particle size(mm)
cumulative
cumulative %
1 7
20
28
21
7 7 3 5 3 5
Particle size (mm)
Figure 11. Particle size distribution of completely worn
Table 3. particle size distribution (count and cumulative) vs bit condition
Particle Size
New Moderate Worn
Count Cumulative Count Cumulative Count Cumulative
0–100 0 0 3 3 1 1
100–200 5 5 54 57 7 8
200–300 13 18 35 92 20 28
300–400 11 29 6 98 28 56
400–500 8 37 4 102 21 77
500–600 1 38 0 102 7 84
600–700 3 41 1 103 7 91
700–800 3 44 0 103 3 94
800–900 0 44 1 104 5 99
900–1000 1 45 0 104 3 102
1000 11 56 0 104 5 107
Cumulative
%
Particle
numbers
%evitalumuC
srebmunelcitraP
Moderately Worn Bit: This distribution is highly con-
centrated in the range of smaller particles, with 54 particles
lying in the 100–200mm range and 35 in the 200–300mm
range. The sudden reduction in particle sizes (no particles
above 300mm) suggests that the moderately worn bit gen-
erates more fine particles than coarser and bigger particles.
This tendency towards finer particles suggests more crush-
ing and grinding rather than precise cutting, as occurs when
wear-resistant bits begin to lose their edge.
Completely Worn Bit: The distribution in this test
matrix showcases that the spread progressively approaches
smaller sizes the largest concentration (28 particles) was
found in the 300–400mm range, and then small concentra-
tions in the 200–300mm (20 particles) and 400–500mm
(21 particles) ranges. Such a wider distribution of larger
3
54
35 6 4 0 1 0 1 0 0
0
20
40
60
80
100
120
Particle size (mm)
cumulative cumulative %
3
54
35
6 4 0 1 0 1 0 0
Particle size (mm)
Figure 10. Particle size distribution of moderately worn bit
1
7
20
28
21
7
7 3 5 3 5
0
20
40
60
80
100
120
Particle size(mm)
cumulative
cumulative %
1 7
20
28
21
7 7 3 5 3 5
Particle size (mm)
Figure 11. Particle size distribution of completely worn
Table 3. particle size distribution (count and cumulative) vs bit condition
Particle Size
New Moderate Worn
Count Cumulative Count Cumulative Count Cumulative
0–100 0 0 3 3 1 1
100–200 5 5 54 57 7 8
200–300 13 18 35 92 20 28
300–400 11 29 6 98 28 56
400–500 8 37 4 102 21 77
500–600 1 38 0 102 7 84
600–700 3 41 1 103 7 91
700–800 3 44 0 103 3 94
800–900 0 44 1 104 5 99
900–1000 1 45 0 104 3 102
1000 11 56 0 104 5 107
Cumulative
%
Particle
numbers
%evitalumuC
srebmunelcitraP