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The Winslow Engineering HR Drill Point Grinder's grinding cycle motions! The Winslow Model HR Drill Point Grinder. It is capable of grinding HSS and carbide drills in the size range of 1/6" - 1 1/2" (1.55mm - 38mm) diameter. It can grind Conventional, Helical, Split Point, Racon, and Bickford Points. The production rate is approximately 80 to 100 drills in the size range of 3/8"(10mm)/ hour for a Conventional or Helical point.