Dormer Tools produce a range of Reamers to finish holes to H7 tolerance. Reaming has always been considered a finishing process and drilling a roughing process. Today, however, many tolerances that used to need a reaming process, can now be met by high-tech drills, such as in the CDX and ADX ranges.
Reamers only cut on the bevel and taper leads; the lands on the body do not cut. They are normally designed with an uneven pitch and an even number of teeth to prevent chatter and ensure good hole surface finish and roundness. They include Hand, Chucking and Machine Reamers with straight or Morse taper shanks. They are available in different materials, including carbide which offers the greatest resistance to wear. Carbide reamers are successfully used to cut steels on rigid machine set ups, but often, High Speed Steel designs will be more cost effective.
