• The Cleveland 2006 left-handed twist, jobber length high-speed steel (HSS) drill bit has a 30-degree helix angle, with a 118-degree drill point and uncoated (bright) surface treatment, which is designed for general purpose drilling applications. Left-hand twist can remove broken bolts and works well with screw machine or turret lathe operations. The shank diameter is the same as the drill size.

    Left-hand twists are commonly used in mass production facilities working on screw machine or drilling (turret) heads. This design allows for a machining center to operate when the spindle cannot be reversed or the drilling operation requires a left-handed drill bit twist. Another function of the left-hand twist is acting as a broken screw or bolt extractor. Using a left-hand drill bit with a reversible drill, you may be able to unscrew the broken item.

    While the 2006 series can be used on most materials, it is most suitable for drilling into various steels, and cast iron. With no coating or surface treatment, this uncoated tool can be used on a broad range of materials. Spiral flutes act as a passageway for chip extraction from the hole and for coolant to enter the hole. The twist of the flutes brings chips up and away from the cutting edge. Round shanks allow use with a wide variety of tool holding systems. 118-degree drill point is the most common angle with a good comprise of performance across a wide range of materials. HSS is a common, general-purpose steel for cutting tools, offers toughness and shock resistance, and is compatible with a variety of materials.

    The tolerances for various aspects of the Cleveland drill bits are: drill diameter range through 1/8 +0.0000 /-0.0005 , over 1/8 to 1/4 +0.0000 /-0.0007 , over 1/4 through 1/2 +0.0000 /-0.0010 , over 1/2 to 1 +0.0000 /-0.0012 , over 1 to 2 +0.0000 /-0.0015 , over 2 to 3-1/2 +0.0000 /-0.0020 ; drill overall length and flute length #80 through 1/8 +0.1250 /-0.0626 , over 1/8 to 1/2 +0.1250 /-0.1250 , over 1/2 to 1 +0.2500 /-0.1250 , over 1 to 2 +0.2500 /-0.2500 , over 2 to 3-1/2 +0.3750 /-0.3750 ; drill point angle diameter range 1/16 to 1/2 included angle 118 or 135 degrees +/-5 degrees, over 1/2 to 1 1/2 included angle 118 degrees +/-3 degrees, over 1-1/2 to 3-1/2 includes angle 118 degrees +/- 2 degrees; drill lip height diameter range 1/16 to 1/8 total indicator variation 0.0020 , over 1/8 to 1/4 total indicator variation 0.0030 , over 1/4 to 1/2 total indicator variation 0.0040 , over 1/2 to 1 total indicator variation 0.0050 , over 1 to 3 1/2 total indicator variation 0.0060 .

    Drill bits are cutting tools used to make holes in a range of materials. They are used in machines such as handheld portable drills, drill presses, machining centers, and lathes. Drill bits come in a variety of types and lengths. Twist drill bits are the most common type of drill bit. They are a round, twisted shaft, end-cutting tool with two or more cutting edges and two or more flutes. Jobber drill bits are the most common length of twist bit. They offer a good comprise of length and reach to work with the widest range of materials and applications.

    Greenfield Industries manufactures tools under the brand names Cleveland, Chicago-Latrobe, Cle-Line, Vermont Tap & Die, Bassett, Putnam Tools, Geometric, Vers-O-Tool, H & G, and Acme-Fette. The company owned by Top-Eastern Group and headquartered in Seneca, SC, makes tools that meet American National Standards Institute (ANSI), National Aerospace Standard (NAS), and Deutsches Institut f r Normung (DIN) standards.


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