The manual Rockwell hardness tester has undergone factory calibration to ensure its accuracy. However, during transportation, minor errors may occur due to vibrations or impacts. Fortunately, the tester can be recalibrated based on its internal structural design. Below are the detailed steps for manual adjustment:
First, perform a manual Rockwell hardness test.
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 confirm that the cylindrical pins on both sides of the weight are correctly seated in the grooves of the fork. Avoid touching the inner walls of the fork while the weight is hanging. If any of these conditions are not met, proceed with the following adjustments.
Second, adjust the manual Rockwell hardness tester.
1. Remove the upper cover. If the measured value is lower than the standard hardness block, first 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, then re-tighten the nut and fix the screw. Re-test the reading until it falls within the acceptable tolerance range. If the measured value is higher than the standard hardness, reverse the direction of the screw rotation.
2. If the reading is still below the expected value, repeat the process by securing the M4 screw with a screwdriver. Loosen the nut slightly and rotate the M4 screw clockwise using the screwdriver. Important: When turning the M4 screw, use a wrench to hold the nut in place so that it does not move. Adjust the dial gauge to zero, then secure the screw and tighten the nut. Test again until the result is within the required tolerance. If the reading is too high, turn the M4 screw in the opposite direction.
By following these steps carefully, you can restore the accuracy of your manual Rockwell hardness tester after transport. Always make sure to double-check the calibration before conducting any critical measurements. Regular maintenance and proper handling will help maintain the performance and longevity of the device.
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