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Speed & Feed Rates

Recommended Cutting Speeds in Feet per Minute for Drilling and Reaming Ferrous Cast Metals

Material
Ferrous Cast Metals
Hardness, HB*Material
Condition*
Cutting Speed, fpm
DrillingReaming
HSSHSSCarbide
Gray Cast Iron
ASTM Class 20120-150A10065300
ASTM Class 25160-200AC9060225
ASTM Class 30, 35, and 40
190-220AC8055180
ASTM Class 45 and 50220-260AC6040125
ASTM Class 55 and 60250-320AC, HT302080
ASTM Type 1, 1b, 5 (Ni-Resist)100-215AC5030150
ASTM Type 2, 3, 6 (Ni-Resist)120-175AC4025140
ASTM Type 2b, 4 (Ni-Resist)150-250ac3020125

Malleable Iron
Ferritic 32510, 35018110-160MHT11075325
Pearlitic 40010, 43010, 45006,
45008, 48005, 50005
160-200MHT8055250
200-240MHT7045180
Martensitic 53004, 60003, 60004200-225MHT5535160
Martensitic 70002, 70003220-260MHT5030150
Martensitic 80002240-280MHT4530100
Martensitic 90001250-320MHT251580

Nodular (Ductile) Iron
Ferritic 60-40-18, 65-45-12140-190
A10065300
Ferritic-Pearlitic 80-55-06190-225AC7045225
225-260AC5030140
Pearlitic-Martensitic 100-70-03240-300HT4025115
Martensitic 120-90-02270-330HT251565
330-400HT10530

Cast Steels
Low Carbon 1010,1020100-150AC, A, N
10065250
Medium Carbon 1030, 1040, 1050125-175AC, A, N9060240
175-225AC, A, N7045220
225-300AC, HT5535200
Low Carbon Alloy
1320, 2315, 2320, 4110,
4120, 4320, 8020, 8620
150-200AC, A, N7550220
200-250AC, A, N6540200
250-300AC, HT5030150
Medium Carbon Alloy
1330, 1340, 2325, 2330,
4125, 4130, 4140, 4330,
4340, 8030, 80B30, 8040,
8430, 8440, 8630,
8640, 9525, 9530, 9535
175-225AC, A, N7045200
225-250AC, A, N6035180
250-300AC, HT4530150
300-350AC, HT3020140
350-400HT2010100

TCT-Reamer-Chart

Recommended material for

Hole DiameterMaterial Left (Diameter)
.090-.170.005-.010
.171-.280.008-.012
.281-.880.010-.016
.881-2.50.015-.030
0500-Drill

Feeds for Drilling

FeedsDiameter
.001-.003 IPR.1250 or less
.002-.006 IPR.1250-.250
.004-.010 IPR.250-.500
.007-.015 IPR.500-1.00
.010-.025 IPR1.00 and up

Metric-to-Standard Conversion Formula (millimeters to inches)
mm 4 25.4 = inches
Example:
12.70 mm 4 25.4 = .500 inches

Calculating Revolutions Per Minute (RPM) from Surface Footage (SFPM) Diameter
12 x SFPM = RPM
p x diameter

Speeds and Feeds
.002 – .003 per flute per revolution
.0025 x number of flutes
= inches per revolution

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