Ripsaw
A ripsaw is a wood saw that is specially designed for making a rip cut, a cut made parallel to the direction of the wood grain.
Design
The cutting edge of each tooth has a flat front edge and it is angled backward by about 8°, in contrast to a crosscut saw, which has teeth angled backward by about 15°.With the "rip" tooth pattern, the edges are sharpened at right angles to the cutting plane, forming chisel-like cutting surfaces, whereas crosscut teeth are sharpened at an angle, so that each tooth has a knife-like cutting point in contact with the wood. This design keeps the saw from following grain lines, which could curve the path of the saw: by acting like a chisel, the saw can more easily cut across deviating grain lines, which is necessary if a straight cut is to be achieved. This feature enables the orthogonal cutting edge to efficiently transport wood-chips from the kerf, allowing subsequent teeth to perform a more effective cut.
It is possible to see this material removal mechanism in action by analyzing frame by frame footage of the cutting process. Ripsaws typically have 4–10 teeth per inch, making them relatively coarse.