Does anyone else use Case length gauge??

[GeoDudeFlorida]

I'm not a machinist so not arguing. Just going by what's on the box.

20220102_172437

• BW460
• Jan 2, 2022

Micometer

Cool (except for the country of origin ). Read the article I posted from Graingers. Not exactly “authoritative” but very accurate (pun intended) and informative.

 

[Atavar]

Not to pick nits but the machinist in me can’t resist: a sliding jaws caliper is a type of micro (to the 3rd decimal) measurement instrument. There’s also types of calipers that are not sliding jaws/scale assemblies which are typically considered more accurate than anvil and screw/spindle micrometers. Micrometer just refers to the level of accuracy, not the instrument. Okay, class dismissed.

Sorry Mr. Machinist, but with your analog sliding jaws caliper you should be easily able to measure to half of the smallest division on the scale, typically .0005.
Micrometers are the same but with a smaller fine division.
Digital instruments have an inherent error of
± 1 digit due to rounding error.

 

[GeoDudeFlorida]

Sorry Mr. Machinist, but with your analog sliding jaws caliper you should be easily able to measure to half of the smallest division on the scale, typically .0005.
Micrometers are the same but with a smaller fine division.
Digital instruments have an inherent error of
± 1 digit due to rounding error.

Calipers ARE micromoeters. That's the point. Tell you what, Skippy, you do some research and go find me something PUBLISHED by an authoritative source that says NO "caliper" can be called a "micrometer" and why and I'll admit I'm wrong. Until then, you can argue with yourself. Oh, and apology accepted.

 

[sparkyv]

This is so sweet! Well done,sir.

For overall case measurements, I use a caliper or a home made “go-no-go” gauge to check for whether cases needed trimming. The Lyman gauge shown above is similar.

Here is one of my gauges.

 

[Atavar]

Calipers ARE micromoeters. That's the point. Tell you what, Skippy, you do some research and go find me something PUBLISHED by an authoritative source that says NO "caliper" can be called a "micrometer" and why and I'll admit I'm wrong. Until then, you can argue with yourself. Oh, and apology accepted.

ROFL
Yur too funny.
I bet I can’t find anything that says you can’t call a caliper a Rhinoceros either. Does that make it a mammal?
Reductio ad absurdum is not a valid argument.
I was a calibration tech for many years, and I know what I would pick up if someone asked for a micrometer.
Regardless of whether dial calipers fall in to the class of micrometers, general use defines micrometers as measuring tools having a screw adjustment and calipers as measuring tools having sliding jaws.
No apology. Argue with yourself.
https://toolguyd.com/calipers-micrometers-differences/

 

[Atavar]

Would you call this a micrometer? It could certainly be called a caliper.

 

[jmorris]

Sometimes I count my steps to measure length, and it works. If I need to be more precise I use a tape measure. More precise than that would be a vernier, dial or digital caliper and even more precise than that would be a micrometer graduated to the ten thousandth.

With the tolerance between max/min case lengths, I use regular calipers.

 

[hdwhit]

No. I just take my calipers (micrometer in the case of pistol cases) and them at maximum length and then use them as a go/no-go gauge.