Changing the striking knife is a simple process, but it must be done with the machine completely secured. The pendulum should remain locked by the electromagnetic hold so it cannot move while the operator works. After opening the protective enclosure, the operator loosens the bolts that keep the current knife attached to the striker head. These bolts sit at the front of the assembly, making them easy to reach with the supplied wrench set.

Once the old knife is removed, the new one (ASTM or ISO) is positioned directly on the machined reference surfaces. The radius of the knife, such as R2 or R8, must match the chosen test standard. The operator then tightens the bolts evenly to ensure proper alignment. A clean contact surface is important, because even a small tilt can affect impact behavior.

After installation, it is recommended to run a quick verification with reference specimens before returning to regular testing. This helps confirm that the new knife is mounted correctly and that the energy values fall within the expected tolerance range.

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