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[Metrology] Resurfacing And Recalibrating Several Surface Plates

Discussion in 'METROLOGY - MEASURE, SETUP & FIT' started by Bob Korves, Jan 21, 2016.

  1. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    Precision Granite (AKA Standridge Granite) is at OxTools (Tom Lipton) freshening up his plates. Really interesting video, and not how I expected the operation would look. Good people, great work...

     
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  2. Matthew Gregory

    Matthew Gregory United States Active User Active Member

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    Thanks for sharing this - fascinating!!!
     
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  3. Holescreek

    Holescreek Active User Active Member

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    When I was working in a very large machine shop in Dayton a group of guys from a place in Michigan called "Doc's" drove down in an old box truck style ambulance to recertify/repair all our granite plates. I watched these very strong fellows pick up, flip and spin plates all day long (big granite plates) knocking the high spots down with diamond dust. It seldom took them more that a couple days to do the 60 or so in our plant.
     
  4. A618fan2

    A618fan2 Active Member Active Member

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    Very cool video - I hate to think what mine would measure out to but then I ain't all that accurate either! Thanks for posting.

    John
     
  5. Ulma Doctor

    Ulma Doctor Infinitely Curious H-M Supporter-Premium

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    gets a man to thinking....
     
  6. astjp2

    astjp2 United States Active User Active Member

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    I could take my grade B and make it an AA!
     
  7. Kennlindeman

    Kennlindeman South Africa Steam crazy Active Member

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    Was looking at Tom's video and was wondering watch the white powder was which they used in between the plates Any ideas
     
  8. Tony Wells

    Tony Wells United States Vice President Staff Member Administrator

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    Graded diamond dust. I've helped lap a few plates.....not much fun.
     
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  9. astjp2

    astjp2 United States Active User Active Member

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    What kind of price is it for a 48x72 plate? Tim
     
  10. Tony Wells

    Tony Wells United States Vice President Staff Member Administrator

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    That's going to vary widely. How far do the calibration people have to travel? Is that the only plate you need done? How bad is it? Is it a pink plate or softer, black granite? What grade do you need it certed to? You'll have to call around for an estimate in your area.
     
  11. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    That is why we got four of us together and had those same guys who did Tom Lipton's plates come and do all of ours at my shop. We got all our plates calibrated, we each saved a lot of money that way, and got a fun social event as part of the deal. What's not to like? :)
    http://www.hobby-machinist.com/threads/surface-plate-calibration-collaboration-or-plate-fest.45514/
     
  12. astjp2

    astjp2 United States Active User Active Member

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    It's a white/gray plate, in Ogden Ut, name brand 50 year old plate that is 49 millionths high to low.
     
  13. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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  14. astjp2

    astjp2 United States Active User Active Member

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    Actually I was wrong, attached is a general layout of the plate....
     

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  15. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    That is AA, Tim!
     
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