Rockwell Hardness Test Demonstration 

Great to hear! Thanks for taking the time to leave a positive comment.

So great to hear! Thanks for watching and taking the time to leave a comment.

Hi, the weight is just a few pounds. The 150kg is the load applied to the penetrator, there is some serious mechanical advantage inside the machine.

Hi Billie. Thank you for this question. Actually I am also going to ask d same question. But finally found yours.

Great to hear! Thanks for watching.

It’s fine to use V-blocks. Here is a guy who grinds cams for a living, and that’s how he does it: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-dP9QA5hfbT0.htmlsi=V_6fUpDuy3kuWc1O

@@RDeanOdell lol. That’s exact video I just saw and is why I’m questioning it. I asked him too but he hasn’t replied. I believe he’s doing it wrong. I’m trying to find an expert on this. Thanks for responding

@@georgea6403 so using v blocks increases the chances for there being an error; there could be dirt or whatever on 4 different surfaces instead of one. I wouldn’t worry about deflection on the camshaft though, the Rockwell test doesn’t apply that much force..

I believe if the gentleman lowered the telescopes from under the 2-1/2” flat anvil, his readings would be closer. Never loosen and tighten the gripsel- the indenter has a flat that lines up with the gripsel and is held in by the spring pressure on the ball against the flat. Not a bad demo compared to what I have seen on RU-vid!

The testing block DOESN'T calibrate the machine, it is just used to verify the maching is reading properly, the test block is created & verified by a outside source, the machine MFG etc.

Hi, sometimes that happens when something is wrong with the piece, like it’s rocking or there is dirt. More likely is that the piece isn’t hard enough to register on the C scale, I would try with Rockwell B and see if you get more reasonable readings.

@@RDeanOdell I also think it's just not hard enough to read properly. I wanted to hear/read it from someone who worked with Hardness/Material more. Thanks!

You need to find out WHAT the requirement of the part you want to check should be MFG blueprints if requiring a specific hardness will state it in a specific category like Rc etc. this machine shone can be set up to check on different scales

@@REVNUMANEWBERN Absolutely! In this case It would be FOR REFERENCE ONLY. Lol In all serousness the Piece being tested was not Hard enough for the way Scale our tester was set up. So the -10 reading was reasonable. We were having some debates in the Machine Shop about things relating to Heat Treat and I needed a Sanity Check. Sometimes someone's telling you something and you just know they aren't as correct as they think they are.

Hi, I think it’s going to depend on what machine you have. As far as I know, the weights are particular to the model of machine. Some machines have the weights internally as well.

Yes, it makes a small indent. The term “destructive” is relative A large casting or forging will not be damaged by an small indent, but a small ground pin or precise part could be made cosmetically or structurally unsound with a standard Rockwell test. Rockwell superficial, Knoop, or Vickers tests reduce the size of the indent, but may not be as accurate in thicker sections,

NO it is NOT a destructive test, destructive test means what it says, DESTROY

Hi, the minor load will be less for a Rockwell Superficial test (which has a much smaller major load). Some machines will output the load in Newtons instead of Kilograms as well, so the number will be different.

@@RDeanOdell but if it has a maximum major load of 150kgs, can't the machine still have a smaller minor load?

Superficial scales (15,30 and 45kgf) have a 3kgf minor load. Standard (60, 100 and 150kgf) has a 10 Kgf The minor load purpose is to imbed the Indenter past any crust or debris before the actual depth measurement is made

Most colleges with a machining or engineering department will have one, as well as machinist shops and material laboratories.

Thanks for the input!

Thanks! Great to hear. I actually made an updated video on the same topic as well.

Thanks for watching! I’m glad it helped.

Thanks so much!

Thanks! I appreciate your comment.

The key for a Rockwell test is stability. Objects that are curved can be accounted for with a cylinder correction. You can shim a small specimen, but it is better to work with a stable part. Often the raw stock is checked before machining operations (unless the part is heat treated.

Google for the name of the tester to find the MFG, contact them and get a operators manual for it

Hi. The red numbers are for the “B” scale and the black numbers are for the “C” scale. The orange green and grey marks have no purpose that I am aware of.

The color portion of the indicator is for rapid testing. I believe on the indicator itself it’s denoted as a “zerominder.” Once you achieve the 2-1/2 turns, you depress the trip bar and then can zero the indicator while the 140kgf load is being applied. Always watch the movement of the large indicator needle, not the handle. Once the needle comes to rest, count one thousand one to one thousand three and gently remove the major load to the minor load position and take your reading. You are allowed + or - 0.5 HRC 60 and greater

3:37 shows the total weight of a stack up loaded on the machine has to be to use the different penatrators, EACH block has a weight on it, they are designed to fit together so the TOP one in the stack shows that TOTAL weight of that setup

They are weighted 40, 50 and 60 KG's

@@jasonestubbs ooooh

Wilson 3JR.

Is it the smallest model? We need tester for very small parts...no need for a huge tester. Can you recommend a model for that?

@@joannayw5272 if you’re performing Rockwell tests, what you have to look for is the vertical opening. That test is a copy of a Wilson 3R. The 3 stands for 8” opening. There are some older Wilson 1JRs (4”) used out in the field, but the 8” is very common. Remember to take in consideration the anvil and Indenter used, that takes away from the vertical capacity