Portable Rebound Leeb Pen-type Hardness Tester Gauge used for part inspection/acceptance?

MMC Design · Nov 10, 2022

Does anyone use a rebound Leeb type hardness tester in their gauge lab as a primary means of accepting that parts meet the hardness specs, or are those strictly limited to floor or field use?

I would expect proper calibration etc if it was a gauge lab asset of course.

thanks,

Mike

bgitter · Dec 29, 2022

Mike, as a Mfr of such equipment, I can assure you that many utilize the Leeb type systems in their gauge labs.You can purchase these with NIST traceable blocks to confirm calibration. But it should be noted that this technology is designed for large work pieces only, with a machined or relatively fine finish. Without the correct environment, these leeb systems will not be effectively accurate. If parts are small or varied from small to medium, its probably better to consider a bench hardness tester for your lab. No hardness tester covers all ground. They all have some limitations.

MMC Design · Dec 29, 2022

bgitter said:
Mike, as a Mfr of such equipment, I can assure you that many utilize the Leeb type systems in their gauge labs.You can purchase these with NIST traceable blocks to confirm calibration. But it should be noted that this technology is designed for large work pieces only, with a machined or relatively fine finish. Without the correct environment, these leeb systems will not be effectively accurate. If parts are small or varied from small to medium, its probably better to consider a bench hardness tester for your lab. No hardness tester covers all ground. They all have some limitations.

Thank you for the information. By large, what size range do you mean? Perhaps 500mm long, approximately the size of a blacksmith anvil and larger for instance? What sort of measurement error can be expected on properly sized parts? Does the error grow as the parts get smaller?

Mike Canaday

bgitter · Dec 29, 2022

The formula is based on mass. So there is no one given minimum dimension. The calibrated test block that comes with the instruments is 3" diam, 2.5" thick steel. Prett hefty. Were you to have a 1" diam, 3" long, steel shaft, the leeb systems probably will not work. So what are you working with? Material, dimensions(lxwxh) and approximate Ra surface roughness or estimate.

MMC Design · Dec 29, 2022

bgitter said:
The formula is based on mass. So there is no one given minimum dimension. The calibrated test block that comes with the instruments is 3" diam, 2.5" thick steel. Prett hefty. Were you to have a 1" diam, 3" long, steel shaft, the leeb systems probably will not work. So what are you working with? Material, dimensions(lxwxh) and approximate Ra surface roughness or estimate.

Some of the parts would be that size or larger. Some would be that diameter, but hollow with .25 and higher wall thickness. Others would be much too small. It seems that the leeb systems would be very useful for very big parts that would not fit into a bench tester.

MMC Design · Dec 29, 2022

MMC Design said:
Some of the parts would be that size or larger. Some would be that diameter, but hollow with .25 and higher wall thickness. Others would be much too small. It seems that the leeb systems would be very useful for very big parts that would not fit into a bench tester.

The surface finish would be 125 or better.

bgitter · Dec 29, 2022

Unfortunately the Leeb systems would not be the right choice for your lab. The portable UCI ultrasonic hardness tester technology would work on your applications, but the costs are far higher for a good quality unit, and the test is more difficult to take. A Bench hardness tester is probably the best avenue.

MMC Design · Dec 29, 2022

Thanks again for answering my questions.

Mike

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