ot--metrology--decade long debacle---the revenge of NIST
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  1. #1
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    Default ot--metrology--decade long debacle---the revenge of NIST

    recently I purchased two involute gear measuring machines from Boeing--the only bidder at $24.99---a 21 inch Fellows and 24 inch Illinois Tool Works

    Boeing kindly included stacks of documents--and from these a difficult to believe tale of 10 year default by our federal government to provide benchmark metrology services for advanced manufacturing of precision gears

    in 1986 the National Bureau of Standards gear metrology instruments fell apart--the 3 million usd needed to replace vintage tools was not authorized until 1996--
    1988 witnessed transformation of NBS to NIST--National Institute of Standards and Technology
    Nist response to non-availability of standardizing gear master gauges was---send them to England or Germany
    and that was protocol for 10 years
    with adequate funding and a building full of non-contact state of art laser gauging tools--Nist in 1996 resurrected gear gauging---with eye popping fees--example--rotary table calibration is now billed in 30 degree arc increments---$3529.00 or $42,348 for a full turn of the table
    when the service was re-established in 1996--Boeing was first in line to have
    involute masters supplied by Fellows and ITW calibrated---which was followed by certifiable documentation of Boeings own stock of 1600 master spline involute standards

    pics include glossys of ITW machine which I am now converting to radius grinder for cutting tools--image of spline master with microscope in Boeing facility--these two machines were repeatable to 0.0001 in and cost 25K and 28K in 1965-66
    Attached Thumbnails Attached Thumbnails 213r.jpg   2345tg.jpg   98uigh.jpg   8jh.jpg   9iljh.jpg  


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    pics illustrate certificate from Oak Ridge--Lockheed Martin metrology of Boeing involute master--Fellows

    4 hours after arriving at my facility--skeletal remains
    Attached Thumbnails Attached Thumbnails 0-98.jpg   100_1419.jpg   100_1421.jpg   100_1424.jpg   100_1426.jpg  


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  5. #3
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    Wow, nice buys!

    I have an optical polygon (eight sides), I'm afraid I'll not be getting it certed at that price (although it's more reasonable than the rotary table pricing - could that be a misprint?).

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    pics illustrate involute masters supplied by machine makers

    right hand master--referred to as an artifact--is Fellows 6 degree

    left hand artifact --cylindrical--is used to calibrate ITW device

    baseline involute calibration begins at 6 degrees and progresses to 39 degrees in increments of one quarter /one third degree

    build quality of these units is finest I have encountered--in keeping with needed repeatability

    both base units will be re-configured for tool-cutter grinding
    Attached Thumbnails Attached Thumbnails 100_1408.jpg   100_1407.jpg   100_1409.jpg  

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    That’s some awesome history you have there.

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