Page 104 - ISCAR(HOLE_MAKING_CATALOG_65)

USER GUIDE
INDEXABLE DRILLS 30 Coolant Flow Rate (liter/min) Drilling Limitations

Recommended Coolant Pressure and Flow Rate

flow
rate
20

10
5

6.8 12 16 20 25
Drill Diameter D (mm)

Minimum Coolant Pressure (bar) Regrinding of drill head is not recommended,
it may cause drill malfunction.
15
8 X D
12
5 X D Centering Hole Data for DCM 8xD
10 We strongly recommend the use of DCN 1.5D drill of the
3 X D
8 same diameter to drill a centering pre-hole. The use of
the centering pre-hole improves hole location, accuracy,
5 roundness, straightness and surface finish and reliability.
5
3

6.8 12 16 20 25
Drill Diameter D (mm)
* For special drills more than 8xD, it is recommended to use higher
coolant pressure 15–70 bar.

To guarantee chip evacuation, the coolant must always
flow through the tool. If the machine is not equipped Use internal coolant with at least 15 bar pressure.
with coolant through the spindle, we recommend
using a coolant inducer. External coolant supply can
be used if hole depth is less than 1xD and reduced
cutting data is applied. The diagram shows the Power/Force Requirements
coolant flow rates for different drills and pressures.
kw Net Power

Coolant Mix 8
Recommended emulsion mix is 6-8%. 6
When drilling in stainless and high strength
steels, a mix of 10% is recommended. 4
When using the IDI drilling head, high pressure oil or
7-15% mineral or vegetable based oil emulsion is highly 2
recommended for drilling stainless steel and
high temperature alloys. 0 6 8 10 12 14 16 18 20 22 24 26
No. of Indexes
Dry Drilling
It is possible to drill without coolant in cast iron. Material: SAE 4340
Oil mist through the drill is then required (for 2xD max). Speed: 100 m/min
Feed: 0.2 mm/rev
Values change for different materials and drilling conditions.

102 ISCAR