neck turning

[gotcha]

Hi Guys! I'm about to get into neck turning. Have a tight necked 6MM so will be turning entire neck into shoulder rather than a skim cut. Ques: (1) What is acceptable variance in neck wall thickness ? (2) Will a carbide turning Mandrel yield a more uniform case wall? (3) What type expander mandrel offers best chance of keeping necks centered to case body?........ I'm a little on the anal side so if you're going to answer please explain WHY your suggestion may be better than another No mud slinging or fur flying please 8) Thanks, Dale

 

[joshb]

I got the PMA set up. 1-.0001, 2- maybe, but I use the SS mandrel. 3- the mandrel die does not form/hold the outside of the case. Just pushes into the neck. Get a good set up and go by the instructions. Easy peasy. I was "strung out" about it, at first. After a few cases, no problem.

 

[LHSmith]

1/ With the proper set-up and technique you should be able to hold 0.0002" or less variance.
2/ Carbide without a doubt will provide the most uniform results due to less friction - the ability to maintain the brass and tooling at a constant temperature will assure uniformity in resultant neck wall thickness.
3/ The best expander mandrel is the one made by the same manufacturer of the neck turner.....buy as a set.

 

[gotcha]

Thanks for the input Guys ! I kinda liked the 21st Century case holder with the O-ring. Anyone use this? Is there a quantifiable advantage to it? I can't justify the cost of the 21st Century lathe for the small amount of neck turning I'll be doing but their case holder seems like a no brainer. Just wondering how others feel about it? I'd be using it with a variable speed drill motor of course.

 

[P1ZombieKiller]

I am partial to the PMA tool also. I bought the adapter to use K&M turning mandrels since I already had the K&M expanding mandrels. But I agree that you should use the same brand expanding mandrels and you use turning mandrels so the brass slides on and off smoothly.

here is a PMA in action turning 30br brass.... 6mm is even smoother on my setup (Dewalt cordless drill set on lowest speed, PMA case holder in chuck).

https://youtu.be/jdfZF5eFPgg

[youtube]https://youtu.be/jdfZF5eFPgg[/youtube]

 

[david12601]

1/ With the proper set-up and technique you should be able to hold 0.0002" or less variance.
2/ Carbide without a doubt will provide the most uniform results due to less friction - the ability to maintain the brass and tooling at a constant temperature will assure uniformity in resultant neck wall thickness.
3/ The best expander mandrel is the one made by the same manufacturer of the neck turner.....buy as a set.

 

[0.1 Aggregate]

Yep, he said that all right….over six years ago. Did you have a comment?



.

 

[Carl Edwards]

I am partial to the PMA tool also. I bought the adapter to use K&M turning mandrels since I already had the K&M expanding mandrels. But I agree that you should use the same brand expanding mandrels and you use turning mandrels so the brass slides on and off smoothly.

here is a PMA in action turning 30br brass.... 6mm is even smoother on my setup (Dewalt cordless drill set on lowest speed, PMA case holder in chuck).

[youtube]

First, I agree with those who said that you can expect a run-out of .0001-.0002 inches if using high quality tools.

I use K&M Percision Shooting Shooting Products, and believe them to be of the highest quality. If you go the K&M route, make sure you purchase the "Ergo Holder." It makes for a much more pleasant operation. The guys at K&M can talk you through equipment selection. They're very easy to work with. Listen to them. They know what they're talking about.