Looks a good tester Dave. To make steel they basically first remove all the impurities from Iron then add different elements in various quantities. Doing this & recording the results was started many years ago (& is still ongoing) so today we know what many mixes will produce a steel with certain properties and can manufacture accordingly.
Leeb is a scetchy one? The tester you have IS a Leeb rebound tester, with a type D (hence HLD on your test block) probe which is most common. It measures using the leeb method, there is a magnet inside the striker body of your probe, and there is a coil in the probe body. The magnet induces a voltage in the coil when it is shot through it and onto the part, and again when it bounces back up. The voltage difference between the signals represent energy imparted into your part, and the hardness can be calculated. It then uses the ISO-18265 or ASTM E140 standards to convert the leeb hardness to whatever scale you choose in the settings, like HRC, HRB and so on. It does NOT perform an HRC test, it does a leeb test and converts it via aforementioned conversion tables. The part you measured is to small and possibly thin (20mm thickness and minimum 2 kg mass) It needs to be coupled to something solid with a couplant or gel. Also 119 brinell does not convert to HRC, it is to soft, HRB would work. You definitely need to move the probe between shots! Please read up if you test important stuff! It is easy to get it wrong with portable testers like this. The probe has a sensor inside that should detect the direction you are testing in, and it may add or subtract some hardness points accordingly. Surfrace finish is important and will affect the spread of your measurements, always do minimum 3 tests and use the average as you result, more is always better.
@@TheMiniMachineShop Next shipment ill throw some more material in for analysis. I am curious what the hardness of that material ive been learning on is.
That was great info!!! The word you never said was alloy. Yes the impurities are what makes physics and chemistry magic happen. Related example, pure water is hard to freeze 'solid' because freezing typically prefers an 'anchor' too trigger the crystal structure. (There are more physics-like words than those I'm sure.) Looking forward too more!
Ive used a big rockwell machine and a microscope to test hardness. Don’t have the money or need to buy that equipment if one of these will work. Have a parts kit Im putting together and had to use a different trunnion. The one I got is like butter though. Hoping this tester will give me an idea of where the real trunnion is vs the butter one I got. So I can heat treat accordingly. Thanks for your in depth look!
Thank you for reviewing our hardness tester, Dave. I would like to know if you would agree if I use your video on my Amazon product page? Or is there a way I can reach you? Thank you for considering my request.
Hello Dave, An interest tool... It reminds me of a hardness tester that the "MotoChassis" channel made, his is more basic but I believe may work on the same principle. I look forward to see more of this item in future videos, thank for sharing. Take care. Paul,,
Dave, you will find a very interesting video a bout hardness testing on Stephan Gotteswinter's channel. You may want to keep your files for quick reference between your new meter and the files.
I was a certified tester and performed metal hardness testing for 6-years for both aluminum and steel. I also performed metal chemistries testing and other testing. The machines that I used would make your new tool look like a kids toy. 😊. Now you just need an XRF analyzer.
