Telebrineller Hardness Testing
Before beginning to record the data, it is a good idea to create a chart. The items to be recorded include strike number, test bar indentation measurement, and test object indentation measurement. Each strike provides a set of indentations that correspond with one another. During the test, each set of strikes should be numbered to help with data recording and collection.
The microscope is used to measure the indentations. It has a ruler inside it and a light to make the indentations easier to see. In well-lit areas, the microscope light is sometimes not needed. The ruler has 1/10 millimeter divisions to allow for accurate measurements within .05 millimeters.
The goal is to measure the diameter of the indentation as accurately as possible. First, line the far edge of the indentation up with the zero line on the ruler. Then, ensure the ruler is going directly across the middle of the indentation. It should look like the pictures above.
Be sure to record the measurements in the appropriate area of the chart. After taking measurements for all indentations made, calculations will be performed to determine the object's hardness.