If you are good toughness sheet metal processing, easy to crack, such as stainless steel plate. Then, notches 6 or 7 times the thickness are also suitable.
If you process plates that are resilient and not easy to crack, such as stainless steel plates. Well, it is also appropriate for the notch to be 7 or 6 times thick.
If the sheet you are working on has good toughness and is not easy to crack, such as stainless steel sheet. It is also appropriate that the groove is 7 or 6 times the thickness of the plate.<br>