Tiny Tools
Drill penetration The surface should be cleanly faced (especially from a nib after parting o operation) and normal to drill axis. Boring operation (enlarging of existing hole) can cause chip forming and evacuation problems, such operation is not recommended. Pre-hole is not required for short drills up to 5XD, center drilling preparation is not allowed. Drill exit Avoid drill exit on signi cant slope surfaces because of breakage danger due to unequal side forces. In case it can’t be avoided, please reduce feed at the exit.
Cross holes Crossing existing holes is a challenge for the drilling operation. In case you can’t avoid that please reduce feed at the crossing stage.
Pecking cycle Generally, in case of optimal conditions, pecking cycle is not required, but if a chip evacuation problem occurs, the pecking cycle can be applied. Using of pecking cycle can reduce drill tool life. General recommendation Choose machine with the best stability and high RPM ability for small diameter drills. Horizontal spindle is preferrable due to better chip evacuation. Provide suitable coolant supply.
Cutting Data
Drill Diameter=DC Feed mm/rev
Cutting Speed m/min
ISO Standard
Material
2 < DC < 2.9
3 < DC< 6
Low and Medium Carbon Steels <0.55%C
80 - 120
0.04 - 0.08
0.10 - 0.25
P
High Carbon Steels ≥0.55%C
70 - 110
0.03 - 0.07
0.08 - 0.14
Alloy Steels, Treated Steels
70 - 100
0.03 - 0.07
0.08 - 0.14
Stainless Steels - Free Cutting
40 - 80
0.03 - 0.07
0.08 - 0.14
M
Stainless Steels - Austenitic
40 - 70
0.03 - 0.07
0.08 - 0.14
Cast Steels
40 - 70
0.03 - 0.07
0.08 - 0.14
K
Cast Iron
70 - 160
0.06 - 0.10
0.10 - 0.25
80 - 200
0.06 - 0.10
0.10 - 0.25
Aluminum ≤12% Si, Copper
N
Aluminum >12% Si
70 - 150
0.05 - 0.08
0.08 - 0.20
Synthetics, Duroplastics, Thermoplastics
90 - 150
0.06 - 0.10
0.10 - 0.25
S
Nickel Alloys, Titanium Alloys
10 - 50
0.02 - 0.04
0.06 - 0.12
H
Hardened Steels
30 - 50
0.01 - 0.04
0.05 - 0.08
40
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