If your toughness processed sheet metal easy to crack, such as stainless steel plate. And that the thickness ratio of the notches is 1: 7 or 1: 6 are suitable.
If you process the plate toughness is not easy to crack, such as stainless steel plate. The ratio of the thickness of the plate to the notch is also 1:7 or 1:6.
If the toughness of the sheet you process is not easy to crack, such as stainless steel sheet. The ratio of plate thickness to groove is 1:7 or 1:6.<br>