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Speed & Feed Rates

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

Material
Light Metals
Material
Condition*
Cutting Speed, fpm
DrillingReaming
HSSHSSCarbide
All Wrought Aluminum AlloysCD400400800
ST and A350350750
All Aluminum Sand and
Permanent Mold Casting Alloys
AC500500900
ST and A350350750
All Aluminum Die Casting AlloysAC300300500
ST and A7070200
Except Alloys 390.0 and 392.0AC125100250
ST and A4540200
All Wrought Magnesium AlloysA, CD, ST and A5005001000
All Cast Magnesium AlloysA, CD, ST and A4504501000
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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