Gauge Blocks

When we were setting up our engine/propeller over haul shop back in the 1960's someone mentioned that two surface tables similar to the one with the bent prop on it were wrung together and hung above the entrance of the factory they were made in.... maybe, maybe not.

Ian S C

And off the walls and ceilings of my workshop here in the tropincs, including the motion detectors of my newly installed burglar alarm with rather annoying results!

I think we all may be missing the point here, Forget the oil, Has anyone thought we may have improved the way a surface finish is accomplished as well as the end result.

Now I do know if you want to remove oil of a surface Ultrasonic Vapour degreaser is the way using freon 13. The military eccept it. And a vapour degreaser cleans in pure fluid because it is condensed by the cooling ring.

Anyway a very interesting conversation.

Larry

Jason interesting post.

So I just got 15 blocks and cleaned them as I normally do, then assembled them. My mic reads to .001mm,

Then I redid the test again, and this time put a thin film of non scented baby oil on them. I got the same measurement.

I really was expecting a measurable error of at least 4 to 5 um. I put together 1.01 to 1.6 and got 17.555mm should have been 17.550, but with the error of the blocks added up that makes it about right. I think baby oil is parafin oil as it just calls it light mineral oil.

Neil L

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Quite so, Jason

MichaelG.

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For those who didn't read it, here is the reference again.

Just a quick PostScript

[we don't really want to resume the debate, do we]

Have a look at this, from NPL.

MichaelG.

It's very telling that the NPL talk of 'achieving an uncertainty' rather than 'achieving an accuracy'.

Neil

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It's much better use of English, I would say.

MichaelG.

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Edit: This is a good place to start.

Edited By Michael Gilligan on 21/02/2015 17:07:33