Gundrill Recommended Machining Conditions

OTensile StrengthHardnessMaterial GroupCutting Speed vcFeed(mm/rev) vs. Drill Diameter(mm)
IS MaterialCondition[N/mm2]HBNo.(1)m/min2.0-9.799.8-11.6911.7-13.1913.2-16.1916.2-40
< 0.25 %CAnnealed420125170-110
Non-alloy >= 0.25 %CAnnealed650190280-110
steel and cast steel, < 0.55 %CQuenched and tempered850250370-1000.01-0.030.03-0.050.035-0.060.04-0.070.02-0.10
free cutting steel >= 0.55 %CAnnealed750220470-110
Quenched and tempered1000300570-90
P Low alloy and castAnnealed600 930200 2756 780-110 70-110
steel (less than 5% of alloying elements)Quenched and tempered1000300860-900.01-0.030.03-0.050.035-0.060.04-0.070.02-0.10
1200350950-80
High alloyed steel, castAnnealed6802001050-700.01-0.030.025-0.040.03-0.0450.035-0.050.12-0.10
steel and tool steelQuenched and tempered110032511
Stainless steel dttlFerritic/ martensitic6802001240-700.01-0.030.025-0.040.03-0.0450.035-0.050.12-0.10
an cas seeMartensitic82024013
M Stainless steel and cast steelAustenitic, duplex6001801440-800.01-0.030.025-0.040.03-0.0450.035-0.050.02-0.10
Ferritic/ pearlitic1801570-100
Grey cast iron (GG)Pearlitic/2601670-100
martensitic
KFerritic1601780-1100.01-0.400.04-0.10.05-0.120.06-0.140.05-0.20
Nodular cast iron (GGG)Pearlitic2501880-110
Ferritic1301990-115
Malleable cast ironPearlitic2302090-115
Aluminum-wrought alloysNot hardenable6021
Hardenable1002280-160
Not hardenable75230.02-0.040.03-0.170.03-0.180.035-0.190.03-0.15
Aluminum-Hl24
cast alloysardenabe90
N >12% SiHigh temperature1302580-120
>1% PbFree cutting11026
CopperBrass9027
alloysElectrolitic copper1002880-1800.02-0.040.02-0.130.03-0.160.04-0.180.03-0.15
Duroplastics,29
Non-metallicfiberplastics
Hard rubber30
Fe basedAnnealed20031
Hardened28032
High temp. alloys Ni CAnnealed25033
or oHardened35034
S basedCast3203525-600.01-0.030.025-0.030.03-0.0350.03-0.040.02-0.10
Pure40036
Titanium alloysAlpha+beta alloys hardened105037
Hardened steelHardened55 HRC3820-500.025-0.030.03-0.0350.03-0.04
HHardened60 HRC39001003002010
Chilled cast ironCast40040.-..-.
Cast ironHardened55 HRC41

(1) For workpiece materials list, see pages 495-524