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#7276455 - 01/06/13 Hi, need advice ,micrometer or caliper?  
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bcraig Offline
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Hi,I need advice on which tool to buy for my purposes.
Occasionally I would like to make chamber cast of MY rifles to determine actual chambering(old military rifles) ,lead or throat etc, and looking for the least expensive tool for the job that will give me accurate readings.
Which one would you recomend,a Micrometer or a caliper?
Thanks
Craig


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#7276472 - 01/06/13 Re: Hi, need advice ,micrometer or caliper? [Re: bcraig]  
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bsa1917hunter Offline
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Depends on what type of precision you are looking for. Real precise, use the micrometer. If not so much, grab the caliper....


Originally Posted by raybass
I try to stick with the basics, they do so well. Nothing fancy mind you, just plain jane will get it done with style.


BSA
#7276549 - 01/06/13 Re: Hi, need advice ,micrometer or caliper? [Re: bsa1917hunter]  
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butchlambert1 Online content
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A good micrometer is lesser expensive than a caliper. A caliper has a longer range. The micrometer is much more accurate.

#7276557 - 01/06/13 Re: Hi, need advice ,micrometer or caliper? [Re: butchlambert1]  
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saddlesore Online content
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Originally Posted by butchlambert1
A good micrometer is lesser expensive than a caliper. A caliper has a longer range. The micrometer is much more accurate.


Only if you have a 4 place one.


If God wanted you to walk and carry things on your back, He would not have invented stirrups and pack saddles
#7276563 - 01/06/13 Re: Hi, need advice ,micrometer or caliper? [Re: saddlesore]  
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bsa1917hunter Offline
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OMG, here we go...Do I need to get some coffee and donuts for anyone....I can see where this is headed....[Linked Image]


Originally Posted by raybass
I try to stick with the basics, they do so well. Nothing fancy mind you, just plain jane will get it done with style.


BSA
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#7276669 - 01/06/13 Re: Hi, need advice ,micrometer or caliper? [Re: bsa1917hunter]  
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Twinkletoes Offline
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I use a micometer for chamber castings, however, if ya do much tinkerin' on firearms, you will end up needing a caliper also.
Just as well buy both.
Twink

#7276993 - 01/06/13 Re: Hi, need advice ,micrometer or caliper? [Re: Twinkletoes]  
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crossfireoops Offline
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Originally Posted by Twinkletoes
I use a micometer for chamber castings, however, if ya do much tinkerin' on firearms, you will end up needing a caliper also.
Just as well buy both.
Twink


Yah,......and either one's only as good as it's condition of calibration, if measurements are to be farmed out, or outsourced.



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-- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain





#7277770 - 01/06/13 Re: Hi, need advice ,micrometer or caliper? [Re: saddlesore]  
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butchlambert1 Online content
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Originally Posted by saddlesore
Originally Posted by butchlambert1
A good micrometer is lesser expensive than a caliper. A caliper has a longer range. The micrometer is much more accurate.


Only if you have a 4 place one.


Are you speaking of a 4 place micrometer? They are still cheaper than a Digital caliper.
As Twinleltoes says, you need both.

#7277925 - 01/06/13 Re: Hi, need advice ,micrometer or caliper? [Re: butchlambert1]  
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bcraig Offline
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Thanks gus I appreciate the information.
I think I am going to get the micrometer first and then a caliper .
I have seen several used on auction sites at seemingly good prices BUT how could I tell if a used one was calibrated properly? and if it wasn,t how expensive to calibrate it myself or get it calibrated ?
Thanks
Craig


Faster horses,Younger women,Older Whiskey,More money
#7278131 - 01/06/13 Re: Hi, need advice ,micrometer or caliper? [Re: bcraig]  
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You should be able to buy a standard to check calibration.

Bravo

#7278706 - 01/06/13 Re: Hi, need advice ,micrometer or caliper? [Re: butchlambert1]  
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Mule Deer Online content
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And you still need both.

If you're serious about handloading, you need a GOOD micrometer and caliper. And contrary to what some people suggest, yes, you can wear out a cheap caliper.


John

"Gunwriters, as you know, aren't as informed as their readers are and if it wasn't for the readers, there would be no need for writers..."--Shrapnel, May 2015
#7279443 - 01/07/13 Re: Hi, need advice ,micrometer or caliper? [Re: Mule Deer]  
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gnoahhh Offline
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Unless of course it is a cheaply priced vernier caliper. (Cheap because few want them anymore.) Potentially more accurate than a dial caliper: no moving parts to wear out (unless the little lines get worn away from looking at them too hard), and will remain calibrated unless the jaws are damaged or otherwise messed with. Downside: who above the age of 19 can read the scale without benefit of a magnifying lens?

I learned with them, so reading the scale is second nature (with a jeweler's loupe screwed into my eye), and are still my go-to calipers. Certainly not for everybody though.

Last edited by gnoahhh; 01/07/13.

"You can lead a man to logic, but you cannot make him think." Joe Harz
#7280351 - 01/07/13 Re: Hi, need advice ,micrometer or caliper? [Re: gnoahhh]  
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bcraig Offline
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Thanks for the info guys.
Craig


Faster horses,Younger women,Older Whiskey,More money
#7280598 - 01/07/13 Re: Hi, need advice ,micrometer or caliper? [Re: bcraig]  
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saddlesore Online content
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I usually drop my calipers and screw them up way before I wear them out. I have one 4 place Brown andS harpe Micrometer, a whole set of up to 4" of Starrets and a General caliper.

Mt father was a machinist and I have all his tools.


If God wanted you to walk and carry things on your back, He would not have invented stirrups and pack saddles
#7316061 - 01/15/13 Re: Hi, need advice ,micrometer or caliper? [Re: saddlesore]  
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HiredGun Offline
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Calipers are better at measuring tapered objects like cartridges due to the smaller contact points. Measuring Cerrosafe is not usually done to the .0001". Read the instructions on the stuff and you will find a decent caliper will tell you all you are going to learn from Cerrosafe anyway. It changes size as it cools and then grows as it ages.

Contraction - expansion factor versus time, measured in inches per square inch:
2 minutes -.0004"
6 minutes -.0007"
30 minutes -.0009"
1 hour +-.0000"
2 hours +.0016"
5 hours +.0018"
7 hours +.0019"
10 hours +.0019"
24 hours +.0022"
96 hours +.0025"
200 hours +.0025"
500 hours +.0025"

Saami specs give a pretty wide range of chamber tolerances too. A caliper is all you need to identify a cartridge from a casting.


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#7318822 - 01/15/13 Re: Hi, need advice ,micrometer or caliper? [Re: butchlambert1]  
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KLStottlemyer Offline
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Get both as you will need both.
I have two set of brown and sharp 0-6" calipers. A set of Starrett 0-3" mics in .0001" a brown and sharp mic set 0-6" in .001" and a Mitutoyo mic set 0-2" set .00005" Plus a set of thread mics

#7319593 - 01/16/13 Re: Hi, need advice ,micrometer or caliper? [Re: KLStottlemyer]  
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hawkins Offline
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Get both Chinese ones work fine. As long as they are zeroed
they can't change calibration. If you are not familiar with a
vernier micrometer (0.0001) you will have to practice with it.

#7323917 - 01/16/13 Re: Hi, need advice ,micrometer or caliper? [Re: hawkins]  
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KLStottlemyer Offline
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Can't change calibration??? Umm by how much are you referring to?

Calibration can change on a mic or a caliper by nothing more then feel.

To heavy handed of a grip will change the reading substantially.

Wear and tear will cause a zero shift. How clean the tool is kept will also cause a failure to zero. Temperature swings will cause mics to read of scale.

Your tool's zero is not fixed and can change. Cleaning the anvils before each use and checking zero is a good practice. But how many of you check through out the scale. Say check it at zero then .250" .5" .750" and even going so far as to check the vernier scale by stacking up enough Joe blocks to get a .0001" shift.
Like .7501" and seeing if the mic with proper feel will hit it. This will show signs of backlash in the screw that can be adjusted out.

#7324321 - 01/17/13 Re: Hi, need advice ,micrometer or caliper? [Re: KLStottlemyer]  
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hawkins Offline
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The zero's on both my calipers and my michrometer are adjustable. The scale factors are set by the mechanics
of the beasts and arenot adjustable. I have a Fowler
caliper and a Chinese somthing or other. In use they
work and read identically. I don't think a reloader
needs a set of gauge blocks.

#7324793 - 01/17/13 Re: Hi, need advice ,micrometer or caliper? [Re: hawkins]  
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KLStottlemyer Offline
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I'm specifically referring to a Micrometer. Where the screw can develop wear and begin to develop back lash so they are not fixed and will shift.

Every precision measuring tool made should be shipped with a standard.

So you just trust that what the caliper or micrometer says is true with no means to verify it to a known standard?

Ebay has[u][certified/u] gage blocks 36 or 81 piece sets for around $50 and $75 give or take respectively. Being so inexpensive I see no reason not to have a set.

I understand the level of accuracy needed in reloading that's not the issue. Assuming your measuring tool is fixed and rigid and never needs calibration is a huge mistake. And zeroing is not calibration. two very different parts of a verification.

#7325233 - 01/17/13 Re: Hi, need advice ,micrometer or caliper? [Re: KLStottlemyer]  
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+1 Kerry!


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