Telebrineller Hardness Testing
Before performing the test, input the test bar into the test bar holder. Make sure the area of the test bar being used does not already have an indentation in it. Creating new indentations over top of old indentations will provide inaccurate results. The test bar holder has a button on it that allows for the operator to easily move the bar in between taking multiple samples.
Often, multiple samples are taken on the same object. It is useful to create a grid to ensure samples are taken evenly across the surface of the object. Place the anvil side of the bar holder on the area to be tested. If the bar holder is unable to rest flat on the object, then hold the opposite side even and steady while performing the test like in the picture.
Performing the test itself involves striking the anvil with a three or five pound sledge hammer. A small indentation will be made simultaneously on the test bar and test object. There is a small ball bearing on the bottom of the test bar holder that creates a dent in the test object, and there is also a ball bearing directly under the anvil which creates a dent in the test bar.
To ensure ease of data collection, number the indentations made after each strike. The data will be collected in sets, so each dent on the test bar has a corresponding dent on the test object. For example, after making the first strike, write a "1" beside each indentation made.
After all strikes are made and numbered, it is time to collect the data.