Page 244 - DC_SWISS(Catalogue_TM_ES-EN)

COMBINATION DRILL/TAPS

General information Programming instructions
DC combination drill/taps - two tools in one, which allows the Countersinking:
drilling and the threading of a workpiece without changing the
tool. Center and countersink simultaneously.
It is the optimal solution for CNC-machines, drilling heads, turret Programming steps for spindle feed and rota-
lathes and tapping machines. tion 100 % synchronised (ideal case):
1) Combi-drill-tap in rapid to start position
Application rang 2) Drilling:
set speed
DC combination drill/taps are recommended for use in mate- set feed
2
rials with a tensile strenght up to 750 N/mm , such as certain avoid long chips
steels, cast iron, aluminium, brass. clear shavings
3) Tapping section in start position
General hints 4) Tapping:
set speed
The core hole must be completely drilled through before the feed = 100 % pitch
tap starts cutting. set thread depth
In short chipping materials, the depth of thread should not tap must be free of swarf before starting to cut
exceed 1.8 x D (type N5952 up to 2 x D). 5) Combi-drill-tap returns to start position.
In long chipping materials, the depth of thread should not
exceed 1.2 x D. Programming steps for spindle feed rotation
Lubricate as for tapping. not fully synchronised:
Important: Mount combination drill-tap in chuck with locked
pressure spring, but with axial compensation on pull.
Cutting speeds 1) Combi-drill-tap in rapid to start position
On drilling heads and CNC-machines, the ideal speeds for 2) Drilling:
drilling and tapping are selected (see our application chart). set speed
If the same speed is selected for both drilling and tapping, we set feed
recommend the values indicated below. avoid long chips
clear shavings
3) Tapping section in start position
4) Tapping:
set speed
feed = 90 - 95 % pitch
set thread depth
5) Combi-drill-tap returns to start position.

Cutting and spindle speeds (guide values)

Speeds for different diameters
Material groups Vc (m/min) M3 M4 M5 M6 M8 M10 M12 M14 M16 M18 M20

Steels up to 500 N/mm 2 20 2120 1600 1270 1060 800 640 530 460 400 360 320

Steels over 500 N/mm 2 15 1600 1200 950 800 600 480 400 340 300 270 240

Cast iron, soft 20 2120 1600 1270 1060 800 640 530 460 400 360 320

Cast iron, hard 15 1600 1200 950 800 600 480 400 340 300 270 240

Brass 25 2650 2000 1600 1330 950 800 660 570 500 450 400

Aluminium 25 2650 2000 1600 1330 950 800 660 570 500 450 400

241