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¡½ DRILL BIT SERIES
DIAMETER LARGER THAN SHANK DRILL

The working part's diameter of this series is bigger than that of the shank(3.175mm).The max. diameter of this series is 6.50mm There are two drilling twice and holw-drilling once.
SLOTTING TYPE DRILL

The series is also called SRILL.The special flute-shape design makes the strength of the drill increase to maximum .It results in high precision of drill processing even in narrow slot with the length of twice drill diameter,They can be effectively applied to the ordinary perforation machines.
STRAIGHT TYPE DRILL
Suitable for various materials such as paper and glass epoxy. This series can be re-pointed several times.
UNDER CUT TYPE DRILL

Specially designed diameter-cutting length ratio ,this minimizes deflection of the drill. The transition from OD to relief-ground section has been carefully made, preventing wall damage during the rapid return stroke.
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¡½ Recommended parameters for drill bits
diameter
spindle speed
(krpm)
feed
(m/min)
chip load
(um/rev)
diameter
spindle speed
(krpm)
feed
(m/min)
chip load
(um/rev)
0.10
125
0.51
4.1
2.10
28
1.96
69.9
0.15
0.76
6.1
2.15
1.91
68.0
0.20
1.02
8.1
2.20
26
1.78
68.4
0.25
1.27
10.2
2.25
1.73
66.4
0.30
105
1.63
15.5
2.30
24
1.57
65.6
0.35
100
1.78
17.8
2.35
1.62
63.5
0.40
95
2.03
21.4
2.40
1.52
63.5
0.45
92
2.16
23.5
2.45
1.50
62.4
0.50
90
2.41
26.8
2.50
22
1.37
62.3
0.55
2.54
28.2
2.55
1.32
60.0
0.60
80
2.67
33.3
2.60
1.32
60.0
0.65
75
2.79
37.3
2.65
1.27
57.7
0.70
70
2.79
39.9
2.70
20
1.17
58.4
0.75
2.95
42.1
2.75
1.12
55.9
0.80
65
2.87
44.2
2.80
1.12
55.9
0.85
3.00
46.1
2.85
1.09
54.6
0.90
60
2.87
52.2
2.90
1.09
54.6
0.95
2.69
50.0
2.95
1.04
52.1
1.00
55
2.79
52.2
3.00
1.04
52.1
1.05
50
2.79
53.8
3.00-3.55
20
0.99
49.5
1.10
2.69
55.9
3.60-3.85
0.97
48.3
1.15
48
2.79
58.2
3.90-4.00
0.91
45.7
1.20
45
2.69
59.8
4.05-4.15
0.91
45.7
1.25
2.79
62.1
4.20-4.35
0.89
44.5
1.30
42
2.69
64.1
4.40-4.55
0.76
38.1
1.35
2.77
65.9
4.60-4.70
0.71
35.6
1.40
40
2.72
67.9
4.75-4.90
0.66
33.0
1.45
2.79
69.9
4.95-5.05
0.61
30.5
1.50
38
2.67
70.2
5.10-5.20
0.58
29.2
1.55
2.74
72.2
5.25-5.40
0.53
26.7
1.60
36
2.59
72.0
5.45-5.55
0.48
24.1
1.65
2.67
74.1
5.60-5.75
0.46
22.9
1.70
35
2.59
74.0
5.80-5.95
0.41
20.3
1.75
2.62
74.7
6.00-6.30
0.36
17.8
1.80
33
2.64
74.7
6.35-6.50
0.30
15.2
1.85
2.44
73.9
1.90
32
2.36
73.8
1.95
2.31
72.2
2.00
30
2.16
72.0
2.05
2.11
70.3