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@25.4_mechanic
Carsten, strange sizing system on the gauge blocks, do you have any idea why they did them this way?
Rich
Carsten, strange sizing system on the gauge blocks, do you have any idea why they did them this way?
Rich
25.4_mechanic
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Hi Rich,
I was wondering the same thing.
My first idea of an explanation was that you might save resources by measuring a production block that came "close" to the target dimension instead of discarting it and indicating the real value on it - the user is also helped by this, he still knows the dimension he is looking for, even if it is "crooked", maybe this is even better in individual cases ....
I then discarded this idea when I saw that there is a system behind the decimal fractions:
5.12 + 5.12 = 10.24 + 5.12 = 15.36 + 5.12 =
why 21.5? That's 15.36 + 6.12 ???To be honest, I don't know - there seems to be a system behind it, but I don't quite understand the violations in the rows ...
Can I maybe get more intermediate measures this way when combining blocks? After all, up to two decimal places?!?!
Anyone?
But I think it's generally a good idea to force users to deal with fractions when measuring.
Especially learners ... since this set does not contain smallest measures, it could be intended for this purpose ....
Carsten
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Sergei Slovenija
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A set of gauge blocks (КМД set) is used to check, calibrate and set the size of such measuring instruments as a micrometer, indicator, sine ruler, etc. The sets are completed in such a way that from the minimum number of КМД it is possible to make a block of any size up to the third decimal place. Gage blocks are made of chromium steel with high quality processing of measuring surfaces and high lapping.
The peculiarity of KMД is that, if necessary, it is possible to connect up to 5 measures by lapping, when all the air is removed between the tiles with polished flat edges and they are compressed by atmospheric pressure. The lapping accuracy is up to 1 µm. Connecting starts with the largest measure from the selected range and ends with the smallest.
KMД set No. 20 includes 23 measures with a nominal value from 0.12 to 5 mm
Sergei Slovenija
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Manufacturer website https://kirovinstrument.ru/%D0%BC%D0%B5%D1%80%D1%8B-%D0%B4%D0%BB%D0%B8%D0%BD%D1%8B-%D0 %BA%D0%BE%D0%BD%D1%86%D0%B5%D0%B2%D1%8B%D0%B5/%D0%BA%D0%BE%D0%BD%D1%86%D0% B5%D0%B2%D1%8B%D0%B5-%D0%BC%D0%B5%D1%80%D1%8B-%D0%B4%D0%BB%D0%B8%D0%BD%D1% 8B-%D1%81%D1%82%D0%B0%D0%BB%D1%8C%D0%BD%D1%8B%D0%B5/%D0%BD%D0%B0%D0%B1%D0% BE%D1%80-%D0%BA%D0%BE%D0%BD%D1%86%D0%B5%D0%B2%D1%8B%D1%85-%D0%BC%D0%B5%D1% 80-%D0%B4%D0%BB%D0%B8%D0%BD%D1%8B-%D1%81%D1%82%D0%B0%D0%BB%D1%8C%D0%BD%D1% 8B%D0%B5-20-%D0%BA%D0%BB-2-detail this set is worth today, in exchange rate terms, approximately $1,000 for Grade 2 (you have Accuracy Grade 1)Hi Rich,
I was wondering the same thing.
My first idea of an explanation was that you might save resources by measuring a block "close" to the target dimension and indicating the value - the user is also helped by this, he still knows the dimension he is looking for, even if it is "crooked", maybe this is even better in individual cases ....
I then discarded this idea when I saw that there is a system behind the decimal fractions:
View attachment 380149
5.12 + 5.12 = 10.24 + 5.12 = 15.36 + 5.12 =
To be honest, I don't know - there seems to be a system behind it, but I don't quite understand the violations in the rows ...
Can I maybe get more intermediate measures this way when combining blocks? After all, up to two decimal places?!?!
Anyone?
But I think it's generally a good idea to force users to deal with fractions when measuring.
Especially learners ... since this set does not contain smallest measures, it could be intended for this purpose ....
Carsten
__
25.4_mechanic
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I better take good care of them then ...
In the box it is written:
"Set # 20, Class 1, Standard 9038-73".
State standard (GOST) # 9038, drawn up in 1973 - not necessarily introduced, that may have happened later.
All gauge blocks in the USSR and also now in Russia are made/judged according to this standard, last revision 1990 -> GOST 9038-90.
Carsten
Sergei Slovenija
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Mechanical measuring instruments, manufactured in the USSR and the GDR, of the appropriate accuracy class and condition, can be bought without expecting a catch. In addition to measuring and calibration rulers and cast iron plates (checking flatness, straightness), they will definitely require editing. My measuring blocks are stored somewhere in Germany and are waiting for me. There are many more.
I better take good care of them then ...
In the box it is written:
"Set # 20, Class 1, Standard 9038-73".
State standard (GOST) # 9038, drawn up in 1973 - not necessarily introduced, that may have happened later.
All gauge blocks in the USSR and also now in Russia are made/judged according to this standard, last revision 1990 -> GOST 9038-90.
Carsten
@25.4_mechanic yes I did the same calcs as you and couldn't figure it out, but there is a repeat through the range.
Maybe they are for setting micrometers as the blocks give a good range through 0-25, 25-50, 50-75 etc
@Sergei Slovenija Thanks I tried Google translate on the website but couldn't find what set 20 were actually for.
Maybe they are for setting micrometers as the blocks give a good range through 0-25, 25-50, 50-75 etc
@Sergei Slovenija Thanks I tried Google translate on the website but couldn't find what set 20 were actually for.
Maker
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I've been thinking about photography again recently, I never use my Sony A6300, but for some stupid reason I want a film camera.
I've been looking at Canon A1s and Mamiya 645s on eBay all weekend. 
Sergei Slovenija
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On the manufacturer's website, there is no word about using the kit and others. The Soviet style was preserved 30 years later (woof-woof, a step to the side - equates to an attempt to escape = shooting on the spot; jumping on the spot - is considered a provocation to escape). I translated information from another source.
slim_boy_fat
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A great-niece of mine is studying at Uni with the aim of becoming qualified as a forensic photographer (or some such, think CSI 
) - they apparently have to use film cameras. I can only assume that digital would be too easy to manipulate and therefore open to being contested by a defence lawyer?
Shame I disposed of all my Olympus and Bronica gear years ago.
) - they apparently have to use film cameras. I can only assume that digital would be too easy to manipulate and therefore open to being contested by a defence lawyer?Shame I disposed of all my Olympus and Bronica gear years ago.
Maker
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What did you have? I like the look of the Bronicas but I think I should stick with 35mm while I don't know what I'm doing so I can get more crap pictures per slightly cheaper roll.Shame I disposed of all my Olympus and Bronica gear years ago.
roblane65
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I've been thinking about photography again recently, I never use my Sony A6300, but for some stupid reason I want a film camera.
I've an old olympus OM10 you can have , not quite what youv'e been looking at but it's old school !
roblane65
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Drop me a pm and we'll sort something outAn OM10 would do me nicely if you're happy to part with it.
I'd rather it go to some one who will use it .I've had it forty years !
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Shame I disposed of all my Olympus and Bronica gear years ago.
Still got all my Pentax SLR kit in the loft, think there's a couple of bodies and half a dozen lenses.
Farside
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You missed the boat for cheap film cameras of any great reputation, but later all-plastic autofocus bodies are still cheap as chips and mostly quite good. I picked up an early EOS 650 for peanuts last year, and keeping an eye on others of the same era, they're not going up much.I've been thinking about photography again recently, I never use my Sony A6300, but for some stupid reason I want a film camera.
That can't be said for the later Mamiya 645s, as they contain a fatal design flaw or two, but it's not reflected in the stupid prices they sell for.
I have a 645J, which is a great unit, but to keep it company I'll pick up a 1000s or similar, not a later one. Quite happy using Pentacon lenses on that, via adapter.
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