While fine teeth make for quick, accurate starts, widely-spaced teeth provide the space necessary to freely clear away cut material, resulting in a fast cut. Progressive pitch saws look to give you the best of both worlds by slowly increasing the tooth pitch across the entire blade. For example, the nine-inch saw pictured above (from Lie-Nielsen) starts at around 9 ppi, increasing the pitch by about a thousandth of an inch with each tooth to end up at around 16 ppi.
And if you’re wondering how the hell you’re going to sharpen such an oddball blade, the answer’s simple: send it back to Lie-Nielsen for a $15 re-sharpening. Street pricing starts at $135.
Progressive Pitch Saw [Lie-Nielsen]