neck thickness micrometer

[mikecr]

dogdude, you just made my day!
Thought I walked alone on this planet...

It took me an hour with hand tools & scraps in the garage. Yeah it's adjustable, both anvil and stop.

 

[mikecr]

When I had Sinclair's vernier Mic, I used a stack of thin nylon bushings to do the same.

 

[Road_Clam]

The added benefit of an arbor/ travel indicator type over a standard tube mic is you can easily check neck thickness concentricity.

 

[mikecr]

There are plenty of gizmos out there, but nothing matches a ball micrometer with a good clutch and proper adjustment/stops for measure of neck thickness.
If you don't believe it, you haven't thought it through yet.

That's not to say this couldn't be improved on. Just that it's not as easy as it would seem on the surface(literally).

 

[boltman223]

Is there a reason why a person couldn't just reduce (bevel/taper) the tip, on a belt sander using 120 grit ?

I came across this and I had to post.

 

[Richard Jones]

Holland sells one and it also needs some type of 'washer/spacer' over the anvil.

 

[bigedp51]

For those of you with off the shelf factory rifles and checking Remchester cases, I like the simplicity of the Redding case neck gauge. One 360 degree spin will tell you a great deal about your brass.

For those of you with AR15s I can say you are better off with Lake City brass for the hardness of the brass, quality and uniformity. Meaning the cheaper "blasting ammo" sold has some horrendous variations in case wall and neck thicknesses. And one spin with the gauge above is good enough for sorting the "blasting ammo" from the cases worth doing more prep work to.

 

[ridgeway]

Is there a reason why a person couldn't just reduce (bevel/taper) the tip, on a belt sander using 120 grit ?

A belt sander with 120 grit won't come close to cutting it. The face is carbide tipped and you would need to diamond wheel to grind it properly. Certainly possible...K&M offers a modified one.

 

[rmist]

I have a Starrett 220 Mic. I've been looking for a ball attachment... no luck. Anybody know where to find one? Or a machinist that might want to make one ?
Thanks again
Rmist

 

[muddy72]

For those of you wanting the 60 degree mod to your mic, I had a offer from "carlsbad" here on the forum to do the 60 degree mod on any mic. He just needed the piston, the price is his to discuss.

 

[Joe Wade]

Here is one that I made using a spare Starrett dial indicator, aluminum bar stock and machine a simple mandril for each caliber. It is fast to use. I like the dial read out, it easily shows any variation.

 

[mikecr]

The Redding case neck gauge, and many versions of it, do not provide the same accuracy as a neck ball mic. Pin anvils will not work as well either, and for the same reasons.
It's the point contact of a ball, with a datum stop, that's needed.