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    Center gage: fake or real

    The engraving looks nice, I say it is real.
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    Do length standards grow over time ?

    I have a 400 mm engraved scale, Made by the Swiss firm SIP. It came from one of their measuring machines. Made around 1960, and came with SIP calibration. I had this calibrated at NIST, came back with an k=2 uncertainty of about 0.3um and the measured dimension matched the SIP values very...
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    SPI Elect-Mike a historical digital micrometer

    Took a while for the filing system of my brain to dig out the original manufacturer, which is Quality Measurement Systems, Inc. of Penfield, NY Here is a mention of the guy that founded it; https://brucerrobinson.weebly.com/ One of the patents for another scale...
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    High accuracy angle measurement

    Here is my take: -Best (simplest) way is to use a set of go, no go gauges , looking for light coming through the gap. This does not give you a quantitative measurement though. -An optical comparator may let you measure directly, some have 1 minute of arc resolution on the rotating screen...
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    High accuracy angle measurement

    I like the idea of making go and no go gauges. Trying to make direct measurement on such short angle leg lengths (to use trig) will result in huge error.
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    SPI Elect-Mike a historical digital micrometer

    I used to use one of those way back. I think it was made by a local company near Rochester NY. Has a glass scale and opto encoder inside. Measures about 1.5 inches if I remember.
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    Tool Scope

    Maybe something from here would work; https://www.titantoolsupply.com/Default
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    Grease discontinued. Switching way lube to oil?

    Nye Lubricants may have a proper substitute.
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    Rotary table/dividing head calibration with theodolite

    A note about damping grease; NYE makes some excellent versions. In optical instruments , it is hard to beat the silky smooth feel with the proper grease. I suggest you use the extra light damping grease, even medium has much more drag than you would expect.
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    Calibrating Mitutoyo 0-12" depth mic set

    Uline is a source for VCI paper.
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    Darkening tool graduations

    Yes, Lacquer Stick; I have used these on cameras too. https://www.amazon.com/MRK51123-co-Industries-Lacquer-Stik-Fill/dp/B002BYWUMO/ref=sr_1_2?crid=14MKVILFHGNT4&keywords=lacquer+stick&qid=1659445878&sprefix=lacquer+stick%2Caps%2C95&sr=8-2
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    - What Brand CMM Should I Buy? -

    For long term accuracy, it is hard to beat granite air bearings on all the axis.
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    OT A1 Canon Camera

    Not a Sony, But the Olympus and Panasonic micro 4/3 cameras can accept any lens. They are mirroless digital camera with very short backfocus so a cheap T type adapter hooks up to any lens.
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    Garden / mowing tractor any built these days with a horizontal shaft engine

    I kind of bought a tractor by accident (a Kubota BX2230 at an estate sale). I needed a mower and it was close enough that I could drive it where it needed to be. Turns out I did need a tractor! I don't have the front end loader that many do, but the mower deck and 3 point accessory connectors on...
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    ISO9000 and AS9100

    We got certified ISO 9000 about 3 years ago, then as an ISO 17025 (calibration Lab) two years ago. My advice is; -Write your procedures based on what you actually do, not what you intend to do. -Don't make procedure too detailed, (to easy to lock yourself in a corner come audit time) -Find a...
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    substitute for Formby tung oil

    Not quite the same, but I like Watco Danish Oil. I never considered it for years, thinking it was just oil. It is combo of penetrating oil and varnish (not poly-urethane). Super easy to apply (wipe on, wait 15 minutes, wipe off, wait overnight, apply more coats if desired). I have an old...
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    stainless steel bolts on aluminum structure

    If you want to hedge your bets a bit, fasteners made from 316 or 316L have improved corrosion resistance. Some of what has been said already, but a bit less antidotal ; Stainless Steel & Aluminum: Why You Shouldn't Use Them Together and Proper Precautions To Take If You Do - Albany County...
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    Tips on Moving a Benchtop CMM

    Ye, that is the general idea. I was looking at this picture; Brown & Sharpe Microval 343 Manual CMM - CMM Technology Installing braces to form a triangle for the bridge and that very tall tower as well as strapping, would be good. The granite might be removable, if it is not used as a bearing...
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    Tips on Moving a Benchtop CMM

    Looks like an air bearing system. You don't want the bearings rubbing against the granite during shipping, so If you can get something between them (sheet of paper?) before you strap everything in place. Lots of long leverage on that unit, so strapping all moving parts would be a very good idea...