The manual Rockwell hardness tester is calibrated for accuracy before it leaves the factory. However, during transportation, minor errors may occur due to vibrations or shocks. If such issues arise, the tester can be adjusted based on its structural design and operational principles. Here is a detailed guide on how to perform the necessary adjustments:
First, conduct a manual Rockwell hardness test to identify any discrepancies. Begin by opening the upper and back covers of the device. Check if the rubber band on the extension rod has been removed from the body. Ensure that the weight on the boom is properly installed, and verify that the cylindrical pins on both sides of the weight are correctly positioned in the grooves of the fork. Avoid touching the inner walls of the fork when the weight is hanging freely. If any of these conditions are not met, proceed with the following adjustments.
Second, adjust the manual Rockwell hardness tester. Start by removing the upper cover. If the measured value is lower than the standard hardness block, secure the M4 screw using a screwdriver. Loosen the nut slightly, then turn the adjusting screw clockwise (approximately half a turn, which corresponds to an increase of about 1 hardness unit). Adjust the dial indicator to zero, re-tighten the screw, and then tighten the nut. Perform another test to ensure the reading falls within the acceptable tolerance range. If the measured value is higher than expected, reverse the direction of the adjustment.
If the measured value is still lower than the reference hardness block, repeat the process. First, fix the M4 screw with a screwdriver, loosen the nut slightly, and rotate the M4 screw clockwise using the same tool. Important: When turning the M4 screw, use a wrench to hold the nut in place so that it does not rotate. This ensures precise adjustment. Once the dial indicator is set to zero, re-secure the screw and tighten the nut. Re-test the device until the readings are accurate. If the result is higher than the standard, turn the M4 screw in the opposite direction.
By following these steps carefully, you can effectively recalibrate your manual Rockwell hardness tester and ensure consistent and reliable measurement results. Always refer to the manufacturer's guidelines for specific tolerances and procedures, and consider professional calibration if further accuracy is required.
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