sirglõiketerakäärid pleki lõikamiseks, mille ülemine lõiketera moodustab alumise suhtes tavaliselt nurga = 2-6° (vt sirglõiketeralõikus; vrd paralleelterakäärid), a machine tool, used for cutting sheet metal or plate, consisting essentially of a fixed cutting knife (usually mounted on the rear of the bed) and another cutting knife mounted on the front of a reciprocally moving crosshead, which is guided vertically inside housings; most sheet or plate is sheared by setting the upper knife at an angle (see: straight knife shearing; compare: parallel shears)