something to check crimp?

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something to check crimp?

Post by orpheoet on Sat Nov 11, 2017 8:53 pm

First topic message reminder :

I recall seeing somebody post a pic of a metal plate with holes from 0.466-0.470 for checking crimp. Is that something that can be bought somewhere? I have a hard time getting accurate measurements with dial calipers.
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Re: something to check crimp?

Post by Gary Wells on Mon Nov 13, 2017 10:47 pm

Jack H wrote:My Starrett and Mauser dial calipers both zero perfectly, and also read perfectly on my 1"  Starrett standard.  The cheap digital has a zero button, but then measures the 1" std as .999
I swear that when I was buying precision hand inspection tools & instruments the brand name "Mauser" was made in Germany and were of exceptional quality & integrity. That time frame goes back into the early '80's

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Re: something to check crimp?

Post by Wobbley on Tue Nov 14, 2017 1:07 am

Mauser made precision vernier calipers for many years after WW2.

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Re: something to check crimp?

Post by Jack H on Tue Nov 14, 2017 1:18 am

Mauser could not make firearms after WW2 so they made instruments like the calipers.   I  do not know how my Mauser dial caliper came to be made in France.  Later production maybe.  Anyway it is every bit as good as the Starrett
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Re: something to check crimp?

Post by w4ti on Tue Nov 14, 2017 7:50 am

fc60 wrote:Greetings,

You can measure the mouth taper crimp with a good hand held micrometer with +/-0.001"

The anvil and stem are quite rigid and cylindrical to each other.

Cheers,

Dave

Dave,

Can you talk about how to get repeatable results with a mic, or caliper, for that matter? Is there a way to develop "feel" other than practicing on a gauge block?

Thanks,
Chase

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Re: something to check crimp?

Post by james r chapman on Tue Nov 14, 2017 8:14 am

Your best option is blade mike's if using a micrometer.
The blades stay in a fixed position.
As suggested, lock them in a fixed dimension. Preferably on a precision measured item like jo blocks or Gage pin.
Then slide the crimped cartridge against the micrometer blades.
Or do the same with calipers. As long as the reference is accurate, a c clamp will do.
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Re: something to check crimp?

Post by jglenn21 on Tue Nov 14, 2017 9:34 am

My experience with digital caliper is that they are poor till you get into the. $100 range..just not consistent. Cheaper dials are better but....   you are much better off buying a used quality tool.

Just me but use whatever method you want to measure crimp but be consistent
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Re: something to check crimp?

Post by james r chapman on Tue Nov 14, 2017 9:43 am

I agree, but, if set to a qualified reference and locked anything rigid will work
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Re: something to check crimp?

Post by jglenn21 on Tue Nov 14, 2017 9:50 am

True 

I will say for the average person a micrometer is much easier to get accurate readings and even cheap ones are pretty accurate within a 1"range
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Re: something to check crimp?

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