The KR-74, a 3-dimensional automatic curve cutter, cuts all shapes of steel plate like line, circle, wall faces and R faces. With the body assembled in light weight with aluminum alloy and angular graduation marked on the torch, this cutting machine demonstrates high work efficiency and allows easy manipulation, capable of bevel cutting the cutting of high precision. We used light and patented rail which was developed by KIRIM, it makes the machine to improve quality of products and efficiency of operation.