Technical Information Band SawsBlade Basics 1423971051.0"11131268 Terminology 1) Width The nominal dimension of a saw blade, as measured from the tip of the tooth to the back of the blade. 2) Gullet The curved area at the base of the tooth. 3) Blade Back The blade body, not including the tooth portion. 4) Gullet Depth The distance from the tooth tip to the bottom of the gullet. 5) Tooth The cutting portion of the saw blade. 6) TPI The number of teeth per inch. 7) Tooth Back or Relief Angle The surface of the tooth opposite the cutting edge, or tooth face. 8) Tooth Face or Rake Angle The cutting surface of the tooth. 9) Tooth Back Clearance Angle The angle of the tooth back measured in relation to the cutting direction of the saw. 10) Tooth Rake Angle The angle of the tooth face measured with respect to a line perpendicular to the cutting direction of the saw. 11) Tooth Pitch The distance from one tooth tip to the next tooth tip. 12) Thickness (Gage) The thickness of the blade. 13) Tooth Set The bending of the teeth from right to left to allow clearance (kerf) of the blade back through the cut. Tooth Form Positive Rake A positive rake is characterized by a 5° to 10° rake angle on the tooth face, resulting in better tooth penetration and easier chip formation. This tooth form is recommended for cutting difficult to machine materials, and solid cross-sections. Standard Straight A standard straight tooth has a 0° cutting face, and is recommended for cutting easy-to-cut, low alloy materials. This is an efficient tooth form for cutting structural materials and interrupted cuts. Regular This is a conventional tooth with a 0° cutting angle, ideal for a wide range of general purpose cutting applications. Hook This tooth type has a 10° positive rake angle for fast cutting with less feed pressure. The rounded, deeper gullets allow for fast chip removal, and is generally used for cutting nonmetallic and non-ferrous metals. Skip This tooth type has a 0° rake angle with shallow gullets and evenly spaced teeth for efficient chip removal. It is used for cutting large sections of soft, non-ferrous metal and nonmetal materials, such as wood, composite materials, cork, and plastic. Turtle Back This is a tooth configuration that has a reinforced shoulder or “Turtle Back Hump” on the back of the cutting edge to prevent stripping out and interrupted cuts. Variable A traditional tooth form that offers a 0° rake angle, varying gullet depths, and tooth sizes. Designed to reduce harmonic vibration, this blade efficiently removes chips, extending blade life in solids and structural. Variable Positive Variable positive tooth form offers varying gullet depths, tooth sizes, and a positive rake angle for maximum cutting speeds and better tooth penetration in harder to machine materials. Duplex Duplex blades offer deep, chip clearing gullets, large chip- resistant teeth, and a high positive rake angle. This results in faster sawing rates, and improved finishes. Duplex blades are recommended for production cutting of work hardened metals, tool steels, and exotic alloys. 5°-10° Positive Rake0° Standard Straight Rake 5°-10° Positive Rake0° Standard Straight Rake Tooth Type RegularVariableHookVariable PositiveSkipTurtle BackDuplex
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