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Recommendations for cutting speed and feed when using coolants

The stated cutting speeds are only valid for the given diameters.
Higher cutting speeds require larger feed rates to give proper chip control.

The cutting recommendations are valid for rigid, stable machines. CERATIZIT
Maxidrills give economic performance on NC lathes, machining centres and
other special machining equipment.

By optimizing the ratio between cutting speed and feed, short well-formed
chips are produced. Chip disposal is assisted by the coolant flow.
Maxidrill short hole drills will produce holes with lengths up to three times
the diameter. The Maxidrill insert drill allows drilling to depths 3 times the
diameter of the drill with a high degree of accuracy and cost effectiveness.

Work piece
material		 Type of treatment / alloy HB
Hard-
ness		 Group N/mm2 Drill diameter (mm) feed f (mm/rev.)
14-17.5 18-23.5 24-29 30-42 38-53
A non alloyed
steel		 annealed, => 0.15% C 125 1 420          
annealed, 0.15%-0.45% C 150-250 2 500-850 0.03 - 0.10 0.05 - 0.12 0.08 - 0.12 0.08 - 0.15 0.10 - 0.25
tempered, => 0.45% C 300 3 1000
low alloy
steel		 annealed 180 6 600 0.03 - 0.10 0.05 - 0.14 0.08 - 0.14 0.10 - 0.17 0.10 - 0.20
tempered 250-300 7/8 850-1000
tempered 350 9 1180
high alloy
steel		 annealed 200 10 680 0.03 - 0.10 0.05 - 0.14 0.08 - 0.14 0.10 - 0.17 0.10 - 0.20
tempered 350 11 1180
corrosion
resistant		 annealed, ferritic 200 12   0.03 - 0.10 0.04 - 0.14 0.08 - 0.16 0.10 - 0.18 0.12 - 0.20
tempered, martensitic 325 13  
R stainless
steel		 annealed,
ferritic / martensitic		 200 14 1100 0.03 - 0.10 0.04 - 0.14 0.08 - 0.16 0.10 - 0.18 0.12 - 0.20
quenched, austenitic 180 14   0.03 - 0.10 0.04 - 0.12 0.08 - 0.14 0.10 - 0.16 0.10 - 0.18
quenched, duplex 230-260 14  
hardened,
martensitic / austenitic		 330 14  
F grey cast
iron		 perlitic / ferritic 180 15   0.04 - 0.12 0.06 - 0.16 0.12 - 0.18 0.14 - 0.22 0.15 - 0.25
perlitic / ferritic 260 16  
grey cast iron
spheroidal
graphite		 ferritic 160 17   0.04 - 0.10 0.08 - 0.14 0.12 - 0.18 0.14 - 0.20 0.15 - 0.22
perlitic 250 18  
tempered iron ferritic 130 19   0.04 - 0.12 0.08 - 0.16 0.10 - 0.18 0.12 - 0.20 0.15 - 0.25
perlitic 230 20  
N malleable
aluminium alloys		 not hardenable 60 21   0.03 - 0.12 0.06 - 0.16 0.10 - 0.18 0.12 - 0.22 0.14 - 0.25
hardenable 100 22  
aluminium
cast alloys		 not hardenable, < 12% Si 80 23  
hardenable, < 12% Si 90 24  
not hardenable, > 12% Si 130 25  
copper &
copper alloys
(bronze, brass)		 machining alloy stock (1% Pb)   26   0.03 - 0.12 0.06 - 0.16 0.10 - 0.18 0.12 - 0.22 0.14 - 0.25
brass, cast 90 27  
bronze 100 28  
lead free copper and
electrolytic copper		 100 28  
non metallic
materials		 thermosetting plastics   29   0.02 - 0.08 0.05 - 0.10 0.08 - 0.12 0.10 - 0.15 0.10 - 0.20
fibre-reinforced plastics   29  
hard rubber   30  
S heat resistant
alloys		 annealed, Fe-base 200 31   0.03 - 0.08 0.04 - 0.08 0.06 - 0.10 0.08 - 0.12 0.09 - 0.14
hardened, Fe-base 280 32  
annealed, Ni- or Co-base 250 33  
hardened, Ni- or Co-base 350 34  
cast, Ni- or Co-base 320 35  
titanium alloys pure titanium Rm400 36   0.03 - 0.08 0.05 - 0.12 0.08 - 0.12 0.10 - 0.15 0.10 - 0.20
alpha & beta-alloys Rm1050 37  

first choice for optimum combination of cutting material
and work piece material

Work piece
material		 Type of treatment / alloy HB
Hard-
ness		 Group Hard Metal Grades cutting speed vc (m/min)
Gm40 Sr226 Sr127 Sr137 S40T U17T
A non alloyed
steel		 annealed, => 0.15% C 125 1 220 - 300 220 - 300 250 - 350 220 - 300 - -
annealed, 0.15%-0.45% C 150-250 2 180 - 250 210 - 290 200 - 280 180 - 250 - -
tempered, => 0.45% C 300 3 180 - 250 200 - 270 200 - 270 180 - 250 - -
low alloy
steel		 annealed 180 6 200 - 280 200 - 280 220 - 300 200 - 280 - -
tempered 250-300 7/8 180 - 220 210 - 290 200 - 250 180 - 220 - -
tempered 350 9 120 - 200 170 - 230 160 - 220 120 - 200 - -
high alloy
steel		 annealed 200 10 140 - 220 180 - 250 200 - 275 140 - 220 - -
tempered 350 11 120 - 160 150 - 200 130 - 180 120 - 160 - -
corrosion
resistant		 annealed, ferritic 200 12 180 - 250 200 - 280 200 - 280 180 - 250 - -
tempered, martensitic 325 13 100 - 150 120 - 170 120 - 170 100 - 150 - -
R stainless
steel		 annealed,
ferritic / martensitic		 200 14 180 - 250 - - - 60 - 150 -
quenched, austenitic 180 14 180 - 250 - - - 60 - 150 -
quenched, duplex 230-260 14 100 - 140 - - - 50 - 100 -
hardened,
martensitic / austenitic		 330 14 80 - 140 - - - 30 - 100 -
F grey cast
iron		 perlitic / ferritic 180 15 - 200 - 300 180 - 280 - - -
perlitic / ferritic 260 16 - 180 - 280 160 - 260 - - -
grey cast iron
spheroidal
graphite		 ferritic 160 17 - 150 - 220 120 - 190 - - -
perlitic 250 18 - 140 - 200 100 - 180 - - -
tempered iron ferritic 130 19 - 160 - 230 140 - 210 - - -
perlitic 230 20 - 120 - 170 100 - 150 - - -
N malleable
aluminium alloys		 not hardenable 60 21 - - - - 150 - 400 200 - 500
hardenable 100 22 - - - - 150 - 400 200 - 500
aluminium
cast alloys		 not hardenable, < 12% Si 80 23 - - - - 150 - 400 200 - 500
hardenable, < 12% Si 90 24 - - - - 150 - 400 200 - 500
not hardenable, > 12% Si 130 25 - - - - 150 - 400 200 - 500
copper &
copper alloys
(bronze, brass)		 machining alloy stock (1% Pb)   26 220 - 300 - - - 200 - 280 250 - 350
brass, cast 90 27 160 - 220 - - - 150 - 200 180 - 240
bronze 100 28 160 - 220 - - - 150 - 200 180 - 240
lead free copper and
electrolytic copper		 100 28 160 - 220 - - - 150 - 200 180 - 240
non metallic
materials		 thermosetting plastics   29 - - - - - 50 - 180
fibre-reinforced plastics   29 - - - - - 50 - 150
hard rubber   30 - - - - - 50 - 200
S heat resistant
alloys		 annealed, Fe-base 200 31 20 - 80 - - - 20 - 40 -
hardened, Fe-base 280 32 20 - 80 - - - 20 - 40 -
annealed, Ni- or Co-base 250 33 20 - 80 - - - 20 - 40 -
hardened, Ni- or Co-base 350 34 20 - 80 - - - 20 - 40 -
cast, Ni- or Co-base 320 35 20 - 80 - - - 20 - 40 -
titanium alloys pure titanium Rm400 36 40 - 100 - - - 30 - 80 40 - 120
alpha & beta-alloys Rm1050 37 40 - 100 - - - 30 - 80 40 - 120


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