which inside micrometer to get to measure case neck thickness

[Cassidy]

Please advise me which inside micrometer - which tool, mfr, model, etc - I should get to measure case neck thickness for my 6.5 x 47 cases? Where should I get it?

Cassidy

 

[kjcpoint]

http://classic.sinclairintl.com/mobile/aspx/search/product.aspx?pid=38096

 

[fdshuster]

The Lyman tubing micrometer is well made (In China), and does a good job. Used one when they first became available & never had any problems. $51 in Midway's catalog, #164-818.

Good quality without costing an arm and a leg. Have since bought a used Mitutoyo for $100 & honestly don't see any great difference between them.

 

[BoydAllen]

Good tip...I wondered about the quality of the Lyman.

 

[gzig5]

You want a tubing or ball mic, not an inside micrometer. Big difference. Just about anything with a round or oval anvil that goes on the inside will work and your budget can absorb. The main thing is that the mic operates smoothly and consistently. The absolute accuracy is not as important as the repeatability. Most of the Chinese made ones are sufficient for what we are doing, though a Starrett or Mitutoyo will pretty much guarantee good results.

 

[bozo699]

I have several different ones,..I like this one,...http://www.sinclairintl.com/reloading-equipment/measuring-tools/micrometers/sinclair-digital-case-neck-micrometer-prod38161.aspx

I also have a starrett on a big adjustable stand that is really nice but it is pretty expensive for the average reloader. For the money I think the sinclair is really nice.
Wayne.

 

[dansig]

Mitutoyo makes the most accurate calipers and other fine measurements tools available

http://www.kmshooting.com/catalog/miscellaneous-items/mitutoyo-wall-thickness-micrometer_60-degree-modification.html

and if you want the most accurate ever made...
http://www.mitutoyo.com/pdf/2057_MDH_Mic.pdf

 

[fdshuster]

Without a doubt this is the best design, with the 60 degree angled contact surface. Mine, as do most, has the wide, flat contact surface making it impossible to get close to the shoulder, with short necked cases like the pictured 223 Rem. I must take the measurement about half way up the case neck.

Spoke to several machinest's about tapering mine and they said there would be a risk of damage because of the carbide insert (visable in the picture).

The 60 degree angle should be standard of the industry, but cost in making is likely the reason for the flat surface.

 

[BoydAllen]

For those that did not follow the link in the previous post, the modified mic. is sold by K&M. The price that is shown is $150. I have a neck mic. that came from Holland's Gunsmithing, that has an unmodified spindle, that works fine for my purposes. I check necks as I turn them, a habit that I picked up back before I had a carbide turning mandrel and there was a greater chance that brass might transfer to the turning mandrel, under the tip of the cutter, causing subsequent necks to be cut thinner than spec. Switching to a carbide mandrel, pretty much eliminated the problem, but given the price of good brass, I still check.

 

[Cassidy]

Thank you all for your helpful feedback!

Cassidy