Page 135 - ISCAR(HOLE_MAKING_CATALOG_65)

USER GUIDE

• DR-DH drills can be used with any type of adaptation. Double-ended Pad
However, concentric adapters such as hydraulic chucks Worn support pads provide poor surface finish in a drilled
are advantageous for better runout. When machining hole. In this case, pads should be rotated or replaced. INDEXABLE DRILLS
high temperature alloys or applying very high machining
loads, it is advisable to use strong gripping adapters Rotate when wear shows on the back side of the pad
such as: side lock adapters, power / hydraulic chucks.
• In case of chip formation or chip evacuation problems,
the following sequence is recommended:
1 Reduce cutting speed by 10%
2 Increase internal coolant pressure
3 Apply a pecking cycle
4 Interrupted cut will have a direct influence on
hole accuracy, quality and drill life. (Sometimes
even tool breakage can occur).

DR-DH Machining Recommendations
Cutting
Tensile Strength Hardness Mtl. No. Speed vc Feed mm/rev
Condition
Material
ISO Rm [N/mm ] HB m/min
2
0.1 - 0.25 %C Annealed 420 125 1 0.10-0.25
0.25 - 0.25 %C Annealed 650 190 2 100-150 0.10-0.25
Non-alloy steel 0.25 - 0.25 %C Quenched and 850 250 3 0.15-0.30
and cast steel, tempered
free cutting steel 0.55 - 0.80 %C Annealed 750 220 4 0.15-0.30
80-150
Quenched and
0.55 - 0.80 %C 1000 300 5 0.15-0.30
P tempered
Annealed 600 200 6 0.15-0.30
Low alloy and cast steel (less 930 275 7 0.15-0.30
than 5% of alloying elements) Quenched and 1000 300 8 70-120 0.15-0.30
tempered
1200 350 9 0.15-0.30
Annealed 680 200 10 80-150 0.10-0.25
High alloyed steel, cast
steel and tool steel Quenched and 1100 325 11 70-120 0.10-0.25
tempered
Ferritic / pearlitic 180 15 0.18-0.35
Grey cast iron (GG) 180-300
Pearlitic / martensitic 260 16 0.18-0.35
K Ferritic 160 17 0.15-0.30
Nodular cast iron (GGG)
Pearlitic 250 18 0.15-0.30
Ferritic 130 19 150-250 0.15-0.35
Malleable cast iron
Pearlitic 230 20 0.15-0.35

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