straight knives
A straight knife cutter, has a vertical blade which reciprocates up and down.
it is capable of bout coarse and precise cutting to a depth of about 300 mm.
corners and curves can be cut accurately. since all of the layers are cut at the same place (unlike a circular cutter), and provided that the knife is held vertical, then all of the pieces cut from a lay are identical.
circular cutters and straight knives are pushed by hand through the stationary material.