Rockwell Indentation Hardness Test. Apparatus GNEHM OM-150 Universal Hardness Tester.
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Transcript of Rockwell Indentation Hardness Test. Apparatus GNEHM OM-150 Universal Hardness Tester.
![Page 1: Rockwell Indentation Hardness Test. Apparatus GNEHM OM-150 Universal Hardness Tester.](https://reader034.fdocuments.in/reader034/viewer/2022050703/56649dab5503460f94a9aad8/html5/thumbnails/1.jpg)
Rockwell Indentation Hardness Test
![Page 2: Rockwell Indentation Hardness Test. Apparatus GNEHM OM-150 Universal Hardness Tester.](https://reader034.fdocuments.in/reader034/viewer/2022050703/56649dab5503460f94a9aad8/html5/thumbnails/2.jpg)
Apparatus
GNEHM OM-150 Universal Hardness Tester
![Page 3: Rockwell Indentation Hardness Test. Apparatus GNEHM OM-150 Universal Hardness Tester.](https://reader034.fdocuments.in/reader034/viewer/2022050703/56649dab5503460f94a9aad8/html5/thumbnails/3.jpg)
Apparatus Diagram
![Page 4: Rockwell Indentation Hardness Test. Apparatus GNEHM OM-150 Universal Hardness Tester.](https://reader034.fdocuments.in/reader034/viewer/2022050703/56649dab5503460f94a9aad8/html5/thumbnails/4.jpg)
Set knob to correct load.Rockwell C test - set knob to 150kg
![Page 5: Rockwell Indentation Hardness Test. Apparatus GNEHM OM-150 Universal Hardness Tester.](https://reader034.fdocuments.in/reader034/viewer/2022050703/56649dab5503460f94a9aad8/html5/thumbnails/5.jpg)
Rotate load lever to vertical position
![Page 6: Rockwell Indentation Hardness Test. Apparatus GNEHM OM-150 Universal Hardness Tester.](https://reader034.fdocuments.in/reader034/viewer/2022050703/56649dab5503460f94a9aad8/html5/thumbnails/6.jpg)
Steel item prepared for testing
![Page 7: Rockwell Indentation Hardness Test. Apparatus GNEHM OM-150 Universal Hardness Tester.](https://reader034.fdocuments.in/reader034/viewer/2022050703/56649dab5503460f94a9aad8/html5/thumbnails/7.jpg)
Select correct penetrating element
Rockwell C 120 degree conical diamond indenter
![Page 8: Rockwell Indentation Hardness Test. Apparatus GNEHM OM-150 Universal Hardness Tester.](https://reader034.fdocuments.in/reader034/viewer/2022050703/56649dab5503460f94a9aad8/html5/thumbnails/8.jpg)
Remove existing element
![Page 9: Rockwell Indentation Hardness Test. Apparatus GNEHM OM-150 Universal Hardness Tester.](https://reader034.fdocuments.in/reader034/viewer/2022050703/56649dab5503460f94a9aad8/html5/thumbnails/9.jpg)
Insert new element
![Page 10: Rockwell Indentation Hardness Test. Apparatus GNEHM OM-150 Universal Hardness Tester.](https://reader034.fdocuments.in/reader034/viewer/2022050703/56649dab5503460f94a9aad8/html5/thumbnails/10.jpg)
Rotate capstan clockwise until test piece is pressed against metal stops
![Page 11: Rockwell Indentation Hardness Test. Apparatus GNEHM OM-150 Universal Hardness Tester.](https://reader034.fdocuments.in/reader034/viewer/2022050703/56649dab5503460f94a9aad8/html5/thumbnails/11.jpg)
Apply preload (Rockwell C is 10kg)
Rotate load lever anticlockwise to horizontal position
![Page 12: Rockwell Indentation Hardness Test. Apparatus GNEHM OM-150 Universal Hardness Tester.](https://reader034.fdocuments.in/reader034/viewer/2022050703/56649dab5503460f94a9aad8/html5/thumbnails/12.jpg)
Set outer dial Rockwell C gauge to zero
record setting, 300 in this case
![Page 13: Rockwell Indentation Hardness Test. Apparatus GNEHM OM-150 Universal Hardness Tester.](https://reader034.fdocuments.in/reader034/viewer/2022050703/56649dab5503460f94a9aad8/html5/thumbnails/13.jpg)
Rotate load lever anticlockwise to vertical down position to apply the final load.
An additional 90kg applies a final load of 100kg
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Record dial reading124 in this case
![Page 15: Rockwell Indentation Hardness Test. Apparatus GNEHM OM-150 Universal Hardness Tester.](https://reader034.fdocuments.in/reader034/viewer/2022050703/56649dab5503460f94a9aad8/html5/thumbnails/15.jpg)
Calculate test piece hardness
300-124 = 76i.e.
76 HR C
Hardness value
Rockwell Hardness
Rockwell C Scale