Changes

Slowly turn the hand wheel to bring the small dial indicator hand to the line. This applies minor pressure load to the penetrator.

Slowly turn the hand wheel to bring the small dial indicator hand to the line. This applies minor pressure load to the penetrator.

4. Apply Major Load

4. Apply Major Load

Turn the hand wheel only until the dial pointer rests on the major pressure load indicated by the chart.

Turn the major load lever back to apply major load.

Be careful to bring the indicator hand exactly to the desired graduation on the dial and no farther. (Once penetration goes beyond the major load, a valid reading can no longer be obtained from that penetration. Go back to Step 2. If reading can no longer be obtained from that penetration. Go back to Step 2. If you did not stop at the major load, go on to Step 6.)

5. Release major load

Turn the hand wheel back to bring the indicator hand back to “SET” and take the reading on the barrel dial through the Lucite magnifier. Each graduation on the barrel dial indicates two points in the Rockwell scale.

Turn the major load lever forward to release major load.

5. Take the reading

6. Take the reading

 

     With the diamond penetrator, read Column C on the barrel dial (black numbers).

     With the diamond penetrator, read Column C on the barrel dial (black numbers).

     With the ball penetrator, read column B (red numbers).

     With the ball penetrator, read column B (red numbers).

NOTE: The first two or three tests may be low until the penetrator and anvil have become firmly seated.

NOTE: The first two or three tests may be low until the penetrator and anvil have become firmly seated.