Speed & Feed Rates

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

Material
Light Metals
Material
Condition*
Cutting Speed, fpm
Drilling Reaming
HSS HSS Carbide
All Wrought Aluminum Alloys CD 400 400 800
ST and A 350 350 750
All Aluminum Sand and
Permanent Mold Casting Alloys
AC 500 500 900
ST and A 350 350 750
All Aluminum Die Casting Alloys AC 300 300 500
ST and A 70 70 200
Except Alloys 390.0 and 392.0 AC 125 100 250
ST and A 45 40 200
All Wrought Magnesium Alloys A, CD, ST and A 500 500 1000
All Cast Magnesium Alloys A, CD, ST and A 450 450 1000
TCT-Reamer-Chart

Recommended material for

Hole Diameter Material Left (Diameter)
.090-.170 .005-.010
.171-.280 .008-.012
.281-.880 .010-.016
.881-2.50 .015-.030
0500-Drill

Feeds for Drilling

Feeds Diameter
.001-.003 IPR .1250 or less
.002-.006 IPR .1250-.250
.004-.010 IPR .250-.500
.007-.015 IPR .500-1.00
.010-.025 IPR 1.00 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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