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INDEXABLE DRILLS Recommended Coolant Pressure and Flow Rate Drilling Limitations USER GUIDE

Coolant Flow Rate
gallon/min

7.92
flow
rate
5.28
2.64
1.32

.27 .47 .63 .80 1.0
Drill Diameter D (inch) Regrinding the drill head is not recommended,
as it may cause drill malfunction.
Minimum Coolant Pressure
PSI
Centering Hole Data for DCM 8xD
217
We strongly recommend the use of DCN 1.5D drill of the
8 X D
174 same diameter to drill a centering pre-hole. The use of
5 X D the centering pre-hole improves hole location, accuracy,
145 roundness, straightness, surface finish and reliability.
3 X D
116
.197”
72

43

.27 .47 .63 .80 1.0
Drill Diameter D (inch)
* For special drills more than 8xD, it is recommended to use higher
coolant pressure 217-1015 psi Use internal coolant with at least 217 PSI pressure.

To guarantee chip evacuation, the coolant must always
flow through the tool. If the machine is not equipped
with coolant through the spindle, we recommend Power/Force Requirements
using a coolant inducer. External coolant supply can
be used if hole depth is less than 1xD and reduced HP Net Power
cutting data is applied. The diagram shows the
coolant flow rates for different drills and pressures. 10.7
8.0
5.4
Coolant Mix
Recommended emulsion mix is 6-8%. 2.7
When drilling in stainless and high strength
steels, a mix of 10% is recommended. 0
.24 .31 .40 .50 .55 .63 .71 .79 .87 .94 1.02
When using the IDI drilling head, high pressure oil or Diameter (inch)
7-15% mineral or vegetable based oil emulsion is highly
recommended for drilling stainless steel and Material: SAE 4340
high temperature alloys. Speed: 330 sfm
Feed: .008 ipr
Dry Drilling
Values change for different materials and drilling conditions.
It is possible to drill without coolant in cast iron.
Oil mist through the drill is then required (for 2xD max).

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