Recommended Machining Conditions for MNC drills

Tensileness HBrial No.(1)Cutt Spee [m/ming d Vc in]26Feedvs. Dr 29ill Diamete 33r F[mm/rev 36] 44
ISO MaterialConditionStrength [N/mm2]HardMateVc minVc maxf minf maxf minf maxf minf maxf minf maxf minf max
< 0.25 %C ≥ 0.25 %CAnnealed Annealed420 650125 1901 2120200
Non-alloy steel and cast steel, < 0.55 %CQuenched and tempered85025030.250.350.250.350.250.400.250.400.280.45
free cutting steel ≥ 0.55 %CAnnealed Quenched and tempered750 1000220 3004 5130190
Annealed6002006
P Low alloy and cast steel (less than 5% of alloying elements)Quenched and temered930 1000275 3007 81201800.250.330.250.330.250.380.250.380.260.43
p12003509
Annealed68020010
High alloyed steel, cast steel and tool steelQuenched and tempered1100325111001600.250.330.250.330.250.360.250.360.260.41
Stainless steel and cast steelFerritic/ martensitic Martensitic680 820200 24012 13901400.120.240.120.240.160.250.180.250.180.30
M Stainless steel and cast steelAustenitic, duplex60018014901400.120.240.120.240.160.250.180.250.180.30
Ferritic / pearlitic18015
Gray cast iron (GG)Pearlitic /26016
martensitic
K NdltiGGGFerritic160171502500.250.400.250.450.30.500.30.500.350.55
ouar cas ron ()Pearlitic25018
Ferritic13019
Malleable cast ironPearlitic23020
Not
Aluminum-wrought alloyshardenable6021
Hardenable100221602600.30.500.30.500.350.550.350.550.40.60
Not
Aluminum- ≤12% Sihardenable7523
Hardenable9024
N cast alloys >12% SiHigh temperature13025
>1% PbFree cutting11026
Brass9027
Copper alloysElectrolytic copper10028
Duroplastics
Non metallic, fiberplastics29
Hard rubber30
Annealed20031
Hih temerature Fe basedHardened28032
g pAnnealed25033
alloys Ni or Co
S basedHardened Cast350 32034 35
Pure40036
Titanium alloysAlpha+beta
alloys,105037
Hardened steelhardened Hardened55 HRC3820500.10.160.120.180.140.20.140.20.160.22
Hardened60 HRC39
H Chilled cast ironCast40040
Cast ironHardened55 HRC41

(1) For workpiece materials list, see pages 495-524 . As a starting value, the middle of the recommended machining range should be used. Then, according to the wear results, conditions can be changed to optimize performance.