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FEEDS & SPEEDS

Introduction
Space
Feed Rate-Circular Interpolation
Space
Circular or Ramp Approach
Space
Helical Interpolation Review
Space
Thread Milling Using Circular and Helical Interpolation
Space
Feeds & Speeds
Space
Milling NPT Threads
Space
Thread Mill Product Notes

FEEDS & SPEEDS

  FEEDS (Inches per Tooth)
MATERIAL SPEED
(FPM)		 CUTTER DIAMETER (Inches)
.250-.350 .500 .750 1.000 2.000
Aluminum & Magnesium 800-UP .001-.004 .003-.006 .004-.008 .006-.009 .007-.010
Brass 500-800 .001-.003 .003-.005 .004-.008 .005-.009 .007-.010
Bronze 400-600 .001-.003 .003-.006 .005-.007 .005-.008 .006-.009
Hard Bronze 220-280 .0005-.002 .002-.003 .004-.006 .004-.007 .005-.008
Cast Iron - Soft 200-280 .0005-.002 .002-.004 .003-.006 .004-.007 .005-.008
Cast Iron - Hard 180-250 .0005-.002 .002-.003 .003-.004 .004-.005 .005-.006
Steel - Soft 230-400 .001-.003 .002-.004 .003-.005 .003-.006 .004-.007
Steel - Medium 200-350 .0005-.003 .001-.003 .002-.004 .003-.005 .004-.007
Steel - Hard 120-220 .0005-.002 .001-.003 .002-.004 .002-.004 .002-.005
Stainless Steel 120-220 .0005-.002 .001-.003 .002-.004 .002-.004 .002-.005

NOTE: SPEEDS shown above are intended for use under average conditions and should be modified according to the chart below. Practical FEED RATES range from .0005 to .010 Inch/tooth/rev. Considerations for best performance are shown below also.

GENERAL
Always ramp in and out of cut
Climb cut whenever possible
NPT Mills must be programmed to feed out on taper
In the case of staggered tooth tools, divide flutes by TWO for feed per tooth
SPEED ADJUSTMENTS
Increase Speed For Reduce Speed For
Soft material
Improved finish
Fine pitches
Frail work pieces or set-ups
Elimination of chipping
Hard materials
Abrasive materials
Coarse pitches
Elimination of excessive wear
FEED ADJUSTMENTS
Increase Feeds For Decrease Feeds For
Coarse pitches
Abrasive materials
Elimination of excessive wear
Easily machinable materials
Frail work pieces or set-ups
Improved finish
Elimination of chipping
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