200 line measurements.

[Gunnut26]

Which micrometer and technique would you recommend for accurate measurements of the 200 line on brass. Seems like the flat standard size anvils on mics reading on the taper of a case would not be accurate to me.

 

[shoot4fun]

Cartridge & Bullet Measuring Tools - .200 Line Tools - PMA Tool

www.pmatool.com

Best I have found for accurately and consistently measuring the 200 line.
I like a blade mic for measuring but the calipers seem to do about as well with these.

 

[JEFFPPC]

A manual tenth mike, measures 4 decimal places. No, I don't like digitals.

 

[JFrank]

I don’t recall who ‘learned me’ this way but it works well just capturing the fat part of the case before and after sizing is accurate enough for brass measuring.

Jim

 

[ELR LVR]

Some Mics have rounded anvils, not ball, but just rounded
You might look for one of those
Heres a Shars
Not ditching B&S type quality but for something not used continually in the machine Dept
$30 on ebay is worth it for occasional use
I have 1 Shars thread pitch mic that is every bit as Nice, smooth as my B&S Mics
----------------------------------------------
However, for this measurement I use my B&S Calipers
They are the only set of calipers I own out of others including Mitutoyo's that give the most consistent and precise measurements

 

[Gunnut26]

A manual tenth mike, measures 4 decimal places. No, I don't

I don’t recall who ‘learned me’ this way but it works well just capturing the fat part of the case before and after sizing is accurate enough for brass measuring.

Jim

Good idea I will try that

 

[Gunnut26]

Some Mics have rounded anvils, not ball, but just rounded
You might look for one of those
Heres a Shars
Not ditching B&S type quality but for something not used continually in the machine Dept
$30 on ebay is worth it for occasional use
I have 1 Shars thread pitch mic that is every bit as Nice, smooth as my B&S Mics
----------------------------------------------
However, for this measurement I use my B&S Calipers
They are the only set of calipers I own out of others including Mitutoyo's that give the most consistent and precise measurements
View attachment 1666332

I was thinking about blade mics but I will look at these also. Thanks

 

[ELR LVR]

I was thinking about blade mics but I will look at these also. Thanks

Blade mics would be great too
If you have ball/tubing mics for measuring the thickness of necks that would work also
if you dont, may as well get some so you can measure neck thickness
then maybe use those

 

[jackieschmidt]

I never really thought it was very complicated.
I measure tapers all of the time. Equal line where you want it, then mic the lines
I do it the same whether measuring a specific spot on a case or on a 10 inch Prop Shaft

 

[Gunnut26]

I never really thought it was very complicated.
I measure tapers all of the time. Equal line where you want it, then mic the lines
I do it the same whether measuring a specific spot on a case or on a 10 inch Prop ShaftView attachment 1666508View attachment 1666515

Thanks Jackie and that pic makes perfect sense

 

[rardoin]

Exactly what Jackie said, flat anvils are what you want on a convex surface. The area you want to measure is going to the the most expanded zone in the case base anyway; it will be the 'high spot' and easy to pick up.