Rockwell Hardness Test

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  • Опубликовано: 13 дек 2024

Комментарии • 101

  • @Nitrxgen
    @Nitrxgen 5 лет назад +56

    why does your guy walk backwards to the testing machine ?

    • @Zephero
      @Zephero 4 года назад +38

      He doesn't know how to walk forwards.
      He's been walking backwards for his whole life

    • @mohawkcollege6123
      @mohawkcollege6123 4 года назад +5

      @@Zephero HAHAHAHAHA. I laughed so hard at this! Good one.

    • @Zephero
      @Zephero 4 года назад +6

      @@mohawkcollege6123 I'm glad I made someone laugh

    • @Chillnel
      @Chillnel 3 месяца назад +1

      It is sort of like hyper awareness response to being watched/recorded. He's focused more on the peripheral vision and using other more physical senses to keep in co-ordination . How do i know ? I've done the same shit before. he's essentially keeping his front side, facing the things he's thinking of secondarily and keeping track of them, while relying on muscle memory and feel to perform the actions he takes.

    • @boucledorge
      @boucledorge Месяц назад

      Haters will say that the video is inverted

  • @WildChildDos
    @WildChildDos 11 лет назад +7

    Yep thnx,nice that u showed all 3 hardness testings in a clear explanation here on YT

  • @nauman8030
    @nauman8030 3 года назад +8

    Please Make more Videos. This is the only channel on Material Science that is good. You guys can help us (little first year undergrad kids) in understanding concepts.....Please

  • @jciupa
    @jciupa 11 лет назад +7

    Great videos, studying for second class power engineering. big help, makes it simple

  • @logansmith4776
    @logansmith4776 2 года назад +2

    Great video, helps me understand the process for parts that I buy within the aerospace industry

  • @philipphpunkt9481
    @philipphpunkt9481 9 лет назад +2

    Sehr interessant. Von Rockwell-Härte habe ich schon oft gehört, aber das Testverfahren kannte ich noch nicht. Danke für die Demonstration!

  • @MaterialsScience2000
    @MaterialsScience2000  11 лет назад +12

    "Any new videos coming out soon?" We are working hard, 7 new videos are almost finished, hope to upload them in 2 or 3 months. Sorry, but we have to do all this besides our daily work.

  • @Noeman2009
    @Noeman2009 6 лет назад +3

    Do you have a video about difference between hardened, tempered, annealed, normalized, heat treated steel?

    • @MaterialsScience2000
      @MaterialsScience2000  6 лет назад +2

      Answer to "Do you have a video about difference between hardened, tempered, annealed, normalized, heat treated steel?" Sorry, no. But I keep it in mind ...

  • @esmealvarado5887
    @esmealvarado5887 5 месяцев назад

    great video! studying for my cwi and this helps !!!

  • @basikwon1
    @basikwon1 8 лет назад +2

    Hello everyone, I had a question regarding Rockwell harness indenters. Hopefully someone can help me out. Ball indenters are classified as class a and class b. I recently ordered an indenter but received a class a indenter, can a class a indenter be used in lieu of a class b? Class b indenters are for everyday use and indirect verifications as class a are to be used for indirect verifications and standardizing test blocks. The company that we purchased from states that a class a can be used for everyday testing since it goes through more stringent QC. Any help would be greatly appreciated.thanks!

    • @sammyblackchow9541
      @sammyblackchow9541 8 лет назад

      I would ask the person(s) that I was performing the test for to give you the information needed. Talk to a certified testing lab.

  • @sudenair22
    @sudenair22 6 лет назад +1

    Please explain the intender and intendation size (width) difference in between HTC and HV. Please advice, that will be very helpful

    • @MaterialsScience2000
      @MaterialsScience2000  6 лет назад +8

      Answer to "Please explain the intender and intendation size (width) difference in between HTC and HV. Please advice, that will be very helpful" You probably mean "HRC" instead of "HTC". This is actually a long story. Main ideas are: The Vickers hardness measurement method is almost universal, giving the opportunity to measure with very low forces (extremely small indents) up to about 100 kp (981 N) (medium size indents). The Rockwell hardness measurement method is suitable for moderately hard to comparative hard materials. HV is difficult to automate (the diagonal of the indent has to be measured), HRC is easy to automate (the depth of indentation is easy to measure). In both cases the indenters are made of single crystal diamond; the lateral dimensions of the indenters are around up to 1 mm, so this is the maximum lateral indent size. The Rockwell hardness measurement method offers many variants, not only the described HRC method.

  • @Philcotigo
    @Philcotigo 8 лет назад +2

    I was looking fo the e variable on screen but only found an h in the lower left corner. Assuming this to be the e from the equation seems to be wrong. So where is e and what is h? If HRC is equal to (0.2-e)*500 and should result in 54.89 then e would be 0.09022mm but not the shown 0.922mm. Is there a digit missing (bad programming of the "Pruefprogramm Nr. 5") or is the assumption e = h wrong? If h would be e then (0,2-0,0922)*500 = 53,9 but not 54.89. The substraction of both equals to 2*10^-3. Is this the innitial indent depth or is there another equation explaining the delta?

    • @MaterialsScience2000
      @MaterialsScience2000  8 лет назад +1

      Answer to "I was looking for the e variable on screen but only found an h in the lower left corner. ..." Sorry, e is equal to h; we should have used the international e instead of h. Congratulations for your observations! The difference between the displayed and the calculated result is due to a calibration procedure. The indenter in our testing machine has been calibrated, using highly reliable specimens with accurately known hardness. Indenters, especially for HRC, are never perfect, and the calibration increases accuracy. Sorry for the late reply, I was extremely busy.

    • @naota3k
      @naota3k 8 лет назад

      Fantastic.

    • @MaterialsScience2000
      @MaterialsScience2000  8 лет назад +1

      I am afraid I am hopeless: Instead of "international e instead of h" the correct answer is "international h instead of e". Sorry.

  • @abdulghaffar2886
    @abdulghaffar2886 3 года назад

    plz tell that these HRB,HRV and HRV are used to determine compressive load

  • @rizwanraza3152
    @rizwanraza3152 10 лет назад

    Thank you very much angela i hv seen all video n i found that helpfull for me

  • @hkchoi4364
    @hkchoi4364 9 лет назад +1

    thank you for the awesome video!

  • @Jayhamzah
    @Jayhamzah 2 месяца назад

    You should show how the final result is obtained after applying the minor and major load

    • @MaterialsScience2000
      @MaterialsScience2000  Месяц назад

      Answer to "You should show how the final result is obtained after applying the minor and major load": The equation for calculating the result is shown at the end of the animation, roughly in the middle of the video. By the way: It is quite interesting why exactly this equation is used and no other ...

  • @ryansafour5479
    @ryansafour5479 11 лет назад +16

    Haha wow, anti climax much! Waiting for something cool to happen.... 'Thats it!'... Did i miss something :p Thanks Uploader!

    • @finnmurtons8727
      @finnmurtons8727 4 года назад

      well all they did is find the hardness of the steel sample. they expect us to wear ppe whenever we use this tester but we really dont need it tbh. our rockwell tester is an older, manual version where you have to manually wind the wheel up until it displays around 100N then you put the weights on, wait 10s, then release

    • @backyardmachinist
      @backyardmachinist 4 года назад

      The more we automate engineering and production, the more it will feel that way. CNC machining is the same. Its important to understand the processes happening though.

  • @maulikruparel7831
    @maulikruparel7831 6 лет назад

    Thanks from Gujarat, India!

  • @Buchunteli
    @Buchunteli 2 года назад

    is HRC28 and HRC40 a good quality?

  • @wyattbrule12688
    @wyattbrule12688 6 лет назад

    I am taking a CWI training course through the AWS. The learning module claims it is IMPERATIVE to prepare the test specimen's surface - I got the sense it should be borderline mirror finished or polished to get an accurate reading. Is this true? or what are the surface metrology requirements?
    Thank you

    • @MaterialsScience2000
      @MaterialsScience2000  6 лет назад +2

      Answer to: "I am taking a CWI training course through the AWS. The learning module claims it is IMPERATIVE to prepare the test specimen's surface - I got the sense it should be borderline mirror finished or polished to get an accurate reading. Is this true? or what are the surface metrology requirements? Thank you" The idea of the preliminary (or minor) load in the Rockwell hardness test is twofold: (i) to press the test piece in a defined way onto the support table and (ii) to create a small preliminary indent. This preliminary indent makes the test result independent of the influence a moderate surface roughness. So for the HRC test the specimen's surface does not need a special preparation, as long as the surface is not too rough. In contrast, a polished specimen surface is required for the Vickers hardness test at very small test forces and very small indents.

  • @lewisrand9488
    @lewisrand9488 8 лет назад

    the permenatnt depth that is measured by 'e' is tht from depth 1 to 3 or 1 to 2????

    • @billdavies6463
      @billdavies6463 5 лет назад

      Watch video from 0.53, it states that the permanent deformation is from 1 to 2.

  • @JustinThompson-yz8yz
    @JustinThompson-yz8yz Год назад

    What if I need a very hard material? Is Rockwell Hardness C of 65 enough?

    • @MaterialsScience2000
      @MaterialsScience2000  Год назад

      Answer to "What if I need a very hard material? Is Rockwell Hardness C of 65 enough?": This depends very much on the application. 65 HRC is a relatively high hardness for steels (maximum about 70 HRC) and many tool steels have this hardness. However, there are much harder materials such as cemented carbides or ceramics. For very hard materials, HRC is not a suitable method and HV is measured instead.

  • @dalebrenke2238
    @dalebrenke2238 9 лет назад

    Question, how do we check hardness when the steel is much thinner, as in 28 ga sheet metal

    • @MaterialsScience2000
      @MaterialsScience2000  9 лет назад

      +Dale Brenke Answer to "Question, how do we check hardness when the steel is much thinner?" If the sample is too thin (in HRC testing less than 0.5 mm (hard material) and 1.6 mm (rel. soft material)) no reasonable test is possible. >> Use Vickers hardness test with low load instead.

  • @AliHasan-gj9tb
    @AliHasan-gj9tb 8 лет назад

    what is different between rockwell hardness test or brinell hardness test ?

    • @kamilqurbanov375
      @kamilqurbanov375 5 лет назад

      Ali Hasan hala cevap arıyorsan cevaplayabilirim

  • @robtennant98
    @robtennant98 8 лет назад

    does this test produce an indentation in the material then?

    • @MaterialsScience2000
      @MaterialsScience2000  8 лет назад

      Answer to "does this test produce an indentation in the material then?": Yes, testing typical materials there is always a permanent indentation. It is not much, in the case of HRC testing up to around 0.2 mm.

  • @talkstreats934
    @talkstreats934 4 года назад

    how do i find the e for this??
    what instrument can i use to measure this e

    • @MaterialsScience2000
      @MaterialsScience2000  4 года назад

      Answer to "how do i find the e for this? what instrument can i use to measure this e?" The depth of indentation e is measured by a displacement transducer (a device that measures a distance / a path). This device is located inside the machine.
      ":

  • @YourAnonymousGuy
    @YourAnonymousGuy 11 лет назад

    thank you for sharing, very usefull .

  • @sixfootdworf9545
    @sixfootdworf9545 6 лет назад

    Why not use Newtons (a standard unit of energy) to measure the force applied to the object, after all, Newtons are an exact and standard measurement of energy.

    • @MaterialsScience2000
      @MaterialsScience2000  6 лет назад +1

      Answer to "Why not use Newtons (a standard unit of energy) to measure the force applied to the object, after all, Newtons are an exact and standard measurement of energy." Well, Newtons are the unit for force, not for energy. But the question, why in many areas of hardness testing the old force unit kilopond (or kilograms force) is still used, is a very old and long one. It has to do with the idea of leaving away the unit in the result of the hardness test, with the problem of changing to the "new" unit Newton, and other points. Sorry, too long to explain here.

  • @tonyapascarella3368
    @tonyapascarella3368 5 лет назад

    The video is very good. Is there a way to contact you to get permission to use this video on my website which sells knives. I think it will help people understand what the Rockwell Harness number means when looking for a knife. Thanks.

    • @MaterialsScience2000
      @MaterialsScience2000  5 лет назад

      Answer to "The video is very good. Is there a way to contact you to get permission to use this video on my website which sells knives. I think it will help people understand what the Rockwell Harness number means when looking for a knife. Thanks.":
      Downloading and hosting the video on your own website is not permitted due to the standard license. However, you can always put an internet link from your own website to the video. This can be done in different ways. Some of them are very attractive.

  • @gaithsabah1026
    @gaithsabah1026 9 лет назад

    Thank you for helping:)

  • @saidiskandar11
    @saidiskandar11 11 лет назад

    Any new videos coming out soon?

  • @austinchew224
    @austinchew224 4 года назад

    How to convert HRB values into HRC values?

  • @vishwassharma
    @vishwassharma 11 лет назад

    Thanks

  • @SlopedOtter
    @SlopedOtter 3 года назад

    That guy walks like he has watched RUclips tutorials on how to walk but has never actually done it

  • @vejet
    @vejet 8 лет назад

    +MaterialsScience2000 Is one test seen as being more reliable then the others(Rockwell/Vickers/Brinell) or do they each have their own advantages/disadvantage and what are those?

    • @MaterialsScience2000
      @MaterialsScience2000  8 лет назад +4

      Answer to "Is one test seen as being more reliable then the others(Rockwell/Vickers/Brinell) or do they each have their own advantages/disadvantage and what are those?": They are all reliable, but they have their own pros and cons. Briefly: Rockwell is easy to fully automate, Vickers offers the possibility to produce very small indents (smaller than a material grain), Brinell the possibility to produce rather large indents (good for testing inhomogeneous materials such as cast irons in one test and get the average hardness).

    • @vejet
      @vejet 8 лет назад

      Thank you for the quick and concise answer.

    • @jeevanselvaraju7449
      @jeevanselvaraju7449 6 лет назад +1

      MaterialsScience2000

  • @MrAghosto
    @MrAghosto 11 лет назад

    Nice Video.. Thanks a lot

  • @shubhamsrivastava6028
    @shubhamsrivastava6028 7 лет назад

    link for Rockwell hardness test B scale please

  • @nathanlubbe3676
    @nathanlubbe3676 11 лет назад

    makes much more sense

  • @moinulshdu
    @moinulshdu 8 лет назад

    good job

  • @muratcelikel8623
    @muratcelikel8623 11 лет назад +7

    bizden kimler izledi :D

  • @apm2649
    @apm2649 3 года назад +1

    Scene💥

  • @ManufacturingET
    @ManufacturingET 11 лет назад

    Thanks!!

  • @tirus7472
    @tirus7472 6 лет назад

    Brother pleas tell me the HRC of mild steel

    • @MaterialsScience2000
      @MaterialsScience2000  6 лет назад

      Answer to "Brother pleas tell me the HRC of mild steel": Mild steel is too soft for HRC measurements; hardness values of around 0 or even negative values would result.

  • @sanjibbarman1404
    @sanjibbarman1404 Год назад

    God blesss you sister

  • @TWalsh2
    @TWalsh2 3 года назад +1

    Since they removed his gear this guy only has reverse.

  • @vijaykumarjones4060
    @vijaykumarjones4060 2 года назад

    🔥

  • @VinayKumar-jq3ed
    @VinayKumar-jq3ed 4 года назад

    Sir please tell what is (0.2) and (500)

    • @MaterialsScience2000
      @MaterialsScience2000  4 года назад +1

      Answer to "Sir please tell what is (0.2) and (500)": The two numbers are used in the equation to convert the measured depth of indentation e into "nice" or "convenient" hardness values of up to 100.

  • @vijaykumarjones4060
    @vijaykumarjones4060 2 года назад

    ✨✨

  • @pnb3876
    @pnb3876 4 года назад

    Does the tester have to walk backwards?!?!

  • @hewdrillingrigs5232
    @hewdrillingrigs5232 5 лет назад

    What is HRC

    • @MaterialsScience2000
      @MaterialsScience2000  5 лет назад

      Answer to "What is HRC": HRC is an abbreviation (or rather a symbol) and means Rockwell Hardness scale C.

  • @tomhunter6158
    @tomhunter6158 2 года назад

    Many mistakes. A copy of current ASTM E18 ( or the European equivalent) should be at hand.
    After every change in test load and indenter you are required to verify correct operation of the tester by checking with a test block.
    No certificate of calibration visible on the tester. You open your self up to a law suit by using uncertified results.
    The surface of the gear is too rough for accurate reading. The surface should be ground and polished. The specifications are in the ASTM manual.
    The gear was induction heat treated, thus the gear teeth a very hard HRC 60 and the body of the gear less hard HRC 45. You choose to test the part on the boundary between the two zones, a pointless operation with no value in the number generated. To test the gear teeth cut out a section of the gear teeth, grind and polish to metallographic finish and then use vickers with one kilogram load. To test the body of the gear you grind and polish a spot and use rockwell as close to center of gear as you can safely test.

    • @MaterialsScience2000
      @MaterialsScience2000  2 года назад +2

      Answer to "Many mistakes ... ": Thank you very much for your detailed comments! I generally agree with almost all of your comments. There are even more issues that need to be considered, and most of them are addressed in the ASTM or EN standards. Why did we do it this way? Our intention was to show the basic principle of HRC hardness testing without going into the details. We do that in all of our videos. The next step would have been to explain all the specific details that need to be taken care of.

  • @linus8759
    @linus8759 6 лет назад +1

    HOLA, ¿QUÉ TAL?

  • @bapestaa
    @bapestaa 8 месяцев назад

    i rate that my drilla

  • @gheegggggg
    @gheegggggg 7 лет назад

    why use non standard unit kliopond? kgf is same much beter

    • @MaterialsScience2000
      @MaterialsScience2000  7 лет назад

      Answer to "why use non standard unit kliopond? kgf is same much beter": Both of them are non-standard units. It is an interesting topic, why there is still a reference to these units. It has to do with old units, the problem of expressing the hardness just as a number and some more points ...

  • @tituszrecsko1869
    @tituszrecsko1869 2 года назад

    Nagyonjolett🙈

  • @mohdizzatlayman4770
    @mohdizzatlayman4770 4 года назад

    Apa nama alatnya

  • @aneesh0011
    @aneesh0011 3 года назад

    Ok

  • @parthasarathymuthukrishnan4392
    @parthasarathymuthukrishnan4392 7 лет назад

    COULD HAVE BEEN ELABORATE

  • @JonnyKV93
    @JonnyKV93 11 лет назад

    Thanks .. :)

  • @TrueTalkReviews
    @TrueTalkReviews 4 года назад

    you forgot to seat the indenter

    • @MaterialsScience2000
      @MaterialsScience2000  4 года назад

      Answer to "you forgot to seat the indenter": Thanks for the comment. I hope I understand you correctly. Typically, the indenter must be used multiple times with a calibration test piece before a proper Rockwell hardness test (not shown in the video). This enables the indenter to be set and a test of the machine itself. In addition, after the end of the standard dwell time of the indenter with the minor force (preliminary load), the depth of indentation is tared (set to zero). This is done automatically by the machine in all tests.

  • @alexisbizaguirre7022
    @alexisbizaguirre7022 2 года назад

    in spanish pless

  • @Zemo-j7e
    @Zemo-j7e Год назад

    was diese zemo

  • @nureenayuni5018
    @nureenayuni5018 7 месяцев назад

    syu single ges