This helps you avoid the pointless expense of scrap waste and customized manufacturing which might be} inevitable Freediving Weights when you don’t take normal sizes of sheet metal into account. This is especially true when designing a sheet metal project. If your daughter used 50 sheets of development paper to make valentines for her class, however solely used 20% of each piece, you’d be irritated, right? Notching is a shearing operation that removes a piece from the outer edge of the metal strip or half. In case, distance between the notches to bend could be very small then distortion of sheet metal could take place.