RPM = Feed Speed (SFM) / 0.26 x Tap's Outer Dimension. Tapping speeds should be " DECREASED " if. • Lubricant is Poor or Flow is Restricted. • Bottom lead or Spiral flute taps are used. • Thread depth ( % ) increase. • Thread pitch is course. • Cutting taper threads (50% Normal Speed). Tapping speeds can be " INCREASED " if.
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