Choosing the Correct Blade Tooth Constant Pitch All teeth on the blade have uniform spacing, gullet depth and rake angle throughout the full length. Typically for general purpose cutting. Identified by one pitch number. Variable Pitch Size of tooth and depth of gullet varies to substantially reduce noise levels and vibrations. Cuts all structurals, tubing and solids smoothly and quickly. Identified by two pitch numbers. Sets Raker A recurring sequence of teeth set left and right, followed by one tooth unset. Frequency of unset teeth on variable pitch blades varies depends on the tooth configurations. Alternate A recurring sequence of teeth set alternately left and right. Wavy Groups of teeth set to each side of the blade, with varying amounts of set in a controlled pattern. Trapezoid Special carbide cylinder, welded to an alloy backer, then precision ground with a high/low tooth form. 13 T erminology