Clinching points have a high repeatability. Their quality can be easily controlled thorugh elementary measurement operations.

For the round point the control of the diameter of the lengthen is realized with a callipers. The value obtained has to be compared with the preconceived value reported on the Instructions Manual of the machine depending on the diameter of the punch and on the thickness of sheet metal.

For the trapezoidal point it is important to control the diameter of the point that is realized in the inferior part of sheet metal. This value has to be compared with the predetermined values included in the Instructions for Use of the machine depending on the width of the punch and on the thickness of sheet metal.