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FEED RATE-CIRCULAR INTERPOLATION

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

FEED RATE-CIRCULAR INTERPOLATION
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Feed rates for peripheral milling with circular interpolation are programmed for the centerline of the cutter. When milling in a circular path, the cutter edge is feeding at a rate different than that of the cutter centerline. The following formula is used to calculate the chip per tooth:

Figure A

NOTES:
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Inches/Minute may be substituted for Chip/Tooth in the formula. In that case the result would be Inches/Minute and the calculation of IPM would not be necessary.
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The programmed Chip/Tooth multiplied by the rpm of the spindle and the number of teeth in the cutter will give the Inches/Minute to program for the feed rate. Feed = Programmed Chip Rate x rpm x Number of Teeth
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In the case of staggered tooth tools, divide the number of flutes by two.
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