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  1. #1
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    Default Can anyone identify these markings?

    I was told the markings are the "Grade" for precession of the grinding. I thought my surface plate was a "AAA" so these marking have nothing in common with that.

    The item was made in the USSR and came out of the Boeing Factory.

    IMG_4871.jpg
    …..Live a Quiet Life & Work with your Hands

  2. #2
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    I found this reference in regards to calibrating during manufacture of a vernier calliper.

    5. Inspection of straightness deviation of the jaws measuring surfaces
    Means of verification – a straightedge type LD of the accuracy class 1
    according to GOST 8026-75, reference gauge blocks of the accuracy grade 1
    according to GOST 9038-90 and an optical flat type PI 60 mm of the accuracy
    grade 2 according to GOST 2923-75.
    So I am guessing this is a reference to part of the making, but still no clearer in understanding it.
    …..Live a Quiet Life & Work with your Hands

  3. #3
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    USSR and now Russia are metric...

    The grading system AA, A and B are imperial...

    Metric is 00, 0, 1

    B and 1 are workshop grade...

    Gost 8026-75 seems to be a Russian Standard...
    Gold, the colour of choice for the discerning person.

  4. #4
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    Default

    Any ideas on the :
    (Symbol) 6 K n(looking thing) 1 L(upside down) OCT????


    I guess the small symbol could be a makers mark.

    Ending in OCT, i thought maybe it was a date, but October is Октя́брьская so it would be OKT not OCT
    …..Live a Quiet Life & Work with your Hands

  5. #5
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    Upside down L is g in english
    The square n could be I

    But that still doesn't help me at all.
    …..Live a Quiet Life & Work with your Hands

  6. #6
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    google translate gives me this

    6 кл 1 г ОCТ = 6 cl 1 g OCT
    Russian = English
    …..Live a Quiet Life & Work with your Hands

  7. #7
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    Hi Dale,

    How big is the surface plate? Any more pictures?

    Here is the ISO standard for surface plates... but it's the standard for Granite.. http://www.backsaw.net/ISO8512-2.pdf

    I don't have the one for cast iron.

    Ray

  8. #8
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    Default

    Just emailed Ilya, he's Russian
    Fancy firewood, sawdust creator and frequent bleeder.

  9. #9
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    Ray I have 4 surface plates the largest is at a guess 1200 x 600mm the other three are small ones.

    Just to clarify as looking back at my original post it may be unclear the markings I am trying to decipher are off a Cast iron straight edge. I was just referring to the surface plate as my only experience with this type of grading the other items I have are all unmarked, large and small Vee blocks, parallels etc.
    …..Live a Quiet Life & Work with your Hands

  10. #10
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    Quote Originally Posted by Evanism View Post
    Just emailed Ilya, he's Russian
    Thanks Evanism, hopefully he can shed some light on it.
    …..Live a Quiet Life & Work with your Hands

  11. #11
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    ГОСТ is the abbreviation for the 'National Standard". According to the web site of russian standards, this particular standard is now replaced with the new one, and I couldn't find a copy of the old one. It is hard to read that technical language, but this standard apparently defines some measuring precision for rulers, micrometers, etc. I will try digging more later today.

  12. #12
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    I found that the straight edges 1.6m that satisfy this standard cost (depending on style) from $600 to $1500 in Russia. That must be a pretty straight straight edge.

    I am not a big expert in precision, but it looks like the precision is marked by "кл 1", аnd I am not sure what it means. I just found that these sort of straight edges can be used to test flatness down to at least 0.02mm.

  13. #13
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    Ilya, Looks like your on the right track and thanks for the info you've managed to find.

    test flatness down to at least 0.02mm
    does that mean 0.02mm over 1.6m???


    "Symbol" "6" "кл 1"(Grade of precision) ГОСТ is the abbreviation for the 'National Standard" 8026-75 (gives us the Gost 8026-75 Russian Standard) USSR obviously the place of origin.

    I wonder how the "6" relates to the "кл 1" could it be 6 in 1?? as in 0.006mm over 1m??
    …..Live a Quiet Life & Work with your Hands

  14. #14
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    It proves to be hard to find - a lot of lists with tools saying that they satisfy the standard, but cannot find what the standard means exactly. What is this thing that this is printed on?

  15. #15
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    Ilya, it is a large cast iron straight edge the I beam or parallel type not the hump back design.




    Here is a conversation I had with a Russian Australian girl on facebook, she has no knowledge of tools and measuring…..she is a dancer. Her answers are in bold



    I think it's 6kg and 1gram (кл= kilogram and г=gram) but might be different depends on the context ,..

    It is the accuracy of a precision engineering measuring tool. It measures straightness or flatness.

    1г is definitely to do with the mass.... But 6 кл could also mean class 6 (like a rating) And considering the item I'd say that's exactly what it means


    So what does the г mean? Is that definitely grams or could it be another weight? It is a huge piece of iron.

    I don't think it's there because it's how much it weighs, I think that might be the marking for the precision of measurement ....

    Is mass a factor when measuring flatness?


    Not really……It could be if there was a level of deflection or expansion an contraction due to temperature but I doubt that would be relevant in this case. If it was made in England it woulsd say something along the lines of accurate to 0.002mm over 1m or over the length of the item. OCT referring to national standard (abbreviation) and 8026-75 being the actual standard being used.


    And that is where I lost her.. lol
    …..Live a Quiet Life & Work with your Hands

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