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Taking things for granted!

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Bogstandard:
If I want to measure something accurately that my micrometers won't reach to, I always use my clock vernier, 8", accurate to about 0.0005". I also have a very nice manual standard vernier that is very accurate, and with that I can easily measure to 1 thou.

Digiverns just aren't accurate enough for precision work, period. I just use them for quick checking, but when getting close ( 0.005"), the micrometers come into play.


Bogs

AdeV:
The first calipers I got were a nice Mitotoyo dial caliper, so I used that exclusively to begin with. I had a cheap metric set too, but that got dropped once too often & isn't so reliable now.

The £8 digi caliper gets a lot of use; but, as per Bogs, if I need accuracy it's the dial caliper; and if i need real accuracy, I use a micrometer.

Brass_Machine:
Bogs and Ade,

Agreed! I have a set of Starret Micrometers for the accurate stuff. Picked one up at a flea market (boot sale) for $5!!

Eric

latheman:
Yeah, well. A few years ago I accidently discovered that the 6" rule(r)s (there now, that should satisfy both camps) I had aquired over the years did not match. Strangely, it was the Rabone Chesterman that was most out - unless that one is right and all the others wrong.

I then discovered a discrepancy between the metric micrometer and dial gauge. Next I bought the 25mm, 50 & 75mm Mitutoyo micrometer standards and tested all my stuff. The end result was that one digital vernier was worse than useless, the other one was consistently low, the dial gauge vernier was also low, whilst the metric micrometer was 0.005mm high at 25mm and a slide vernier (0.05 resolution) was dead accurate (as far as I could tell). In addition, the digital devices eat batteries - there is a website somewhere which compares battery usage rates with Mitutoyo being the best, and surprisingly, that none of them actually stopped taking current when switched off.

I now use the micrometer, followed by the slide vernier (within reason), followed by a new Starrett dial gauge (0.01 resolution), and lastly the better of the two digital verniers.

Looking at the digital specs that I have seen, not many I accept, and understanding a little bit about digital electronics, I would not advise anyone to use digital unless they are not bothered about the least significant digit (this, due to the electronic circuitry, will always have an error of 1 either side of the correct reading).

Regards,

Peter G. Shaw

AdeV:
I must admit that my expensive-looking M&W depth gauge (I bought it second hand for a tenner, or thereabouts) appears to be wildly inaccurate (10+ thou) compared to all of the calipers I've got... unless all of the calipers are wrong...

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