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  1. 24th February 2013, 09:59 PM #61
    Stustoys
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    Hi RC,
    Its "about" 0.0005" off over 500mm.
    I really should come up with a better number. Feel just a little silly saying "about" when I'm taking sub 0.001"

    Stuart
  2. 24th February 2013, 10:18 PM #62
    .RC.
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    Yea I know sub 0.001 under a micron
    Light red, the colour of choice for the discerning man.
  3. 24th February 2013, 11:41 PM #63
    Brobdingnagian
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    Quote Originally Posted by Stustoys View Post
    Hi RC,
    Its "about" 0.0005" off over 500mm.
    I really should come up with a better number. Feel just a little silly saying "about" when I'm taking sub 0.001"

    Stuart
    A little more precision and you have to start talking in probability; quantum effects and all that.

  4. 24th February 2013, 11:48 PM #64
    Stustoys
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    Maybe I should have said "less than a thou". Which it is...... its about half lol
  5. 24th February 2013, 11:59 PM #65
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    Ueee
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    Quote Originally Posted by Brobdingnagian View Post
    A little more precision and you have to start talking in probability; quantum effects and all that.

    Square boy: Do not try and measure the square. That's impossible. Instead... only try to realize the truth.

    Neo: What truth?

    Square boy: There is no square.

    Neo: There is no square?

    Square boy: Then you'll see, that it is not the square thats out, it is only yourself......
    1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
  6. 25th February 2013, 12:27 AM #66
    Brobdingnagian
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    HA!



    Yoda: No. square ... or square not. There is no square.
  7. 25th February 2013, 09:44 AM #67
    .RC.
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    Quote Originally Posted by Brobdingnagian View Post
    Here is an interesting video I found

    Gauging Quality, Episode 1 - Surface Plates - YouTube

    An extremely good video..

    I know of a person that when the subject of surface plates, yaps on and on and on and shows everyone spec sheets and other stuff claiming this that and the other...

    I found the video great in that it showed the repeat-o-meter and that even though the level showed the plate was Grade A, it failed Grade A with the repeat-o-meter test. This aformentioned person does not even know what a repeat-o-meter is, has no idea it is part of the test to calibrate a surface plate... The chinese level certificates alone are good enough for him...
    Light red, the colour of choice for the discerning man.
  8. 28th February 2013, 08:31 PM #68
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    Whilst on the subject of measuring plates.....
    Do granite plates have accurately finished sides? Are they square to each other and the face?

    Josh, If you don't mind i'll give you a few jo blocks on Saturday to measure, just to see if the certificate with them is generic or not.
    1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
  9. 28th February 2013, 09:56 PM #69
    Brobdingnagian
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    Quote Originally Posted by Ueee View Post
    Whilst on the subject of measuring plates.....
    Do granite plates have accurately finished sides? Are they square to each other and the face?

    Josh, If you don't mind i'll give you a few jo blocks on Saturday to measure, just to see if the certificate with them is generic or not.
    Sure, if you don't mind if that I take them with me? the laser is not really an easy thing to move around.
  10. 28th February 2013, 10:02 PM #70
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    What, it doesn't come with a cigarette lighter adapter????

    Of course, i'll get a "stamped, self addressed envelope" tomorrow for the return journey.
    1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
  11. 28th February 2013, 10:04 PM #71
    Brobdingnagian
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    HA!

    No it is because all the boxes for the optics are of no uses since all the foam turned to goo.
  12. 8th March 2013, 05:01 PM #72
    Brobdingnagian
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    Does any one know that the repeatability spec is on ISO surface plates?
  13. 8th March 2013, 08:32 PM #73
    Michael G
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    The spec for ISO surface plates is 8512-2 (CI is -1) but I haven't got a copy. The AS equivalent is 1004.2 (DIN is 876-1 or 2)

    Michael
  14. 8th March 2013, 08:41 PM #74
    Brobdingnagian
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    Sorry I acutually ment what the tolerances specified are for repeatability and what the gauging technique is ment to be for ISO/DIN/AS plates.
  15. 8th March 2013, 08:50 PM #75
    Michael G
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    Will these help?
    The Foundation of Dimensional Measurement - Mahr Metrology
    http://www.doxcalibration.com/DOX3ptsupport.pdf


    I'll also email a copy of GGG-P-463C to you as that may help (old as it is - 1973)

    Michael
    Last edited by Michael G; 8th March 2013 at 08:57 PM. Reason: added reference
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