Neck Wall Thickness?

[jawshunting]

I am turning 6br brass,Lapua)on a Forster neck turning hand lathe. It is the trimmer with a neck turning attachment. I am getting one side of the neck wall that is thinner than the other sides. All measure 0.009, while one side measures 0.0085. I am shooting in the 2's and 3's with very little load development at this time. My question, if I want the best that it can do, do I get another neck turning tool, or does this minute amount make any difference? I can't understand if the lathe or the pilot is messed up. Let me know. jawshunting

 

[billmo]

Man, if you are getting them down to .0005, I'd say that is good enough. It don't take a whole lot of flop to get .0005 Good work. Bill

 

[CatShooter]

I am turning 6br brass,Lapua)on a Forster neck turning hand lathe. It is the trimmer with a neck turning attachment. I am getting one side of the neck wall that is thinner than the other sides. All measure 0.009, while one side measures 0.0085. I am shooting in the 2's and 3's with very little load development at this time. My question, if I want the best that it can do, do I get another neck turning tool, or does this minute amount make any difference? I can't understand if the lathe or the pilot is messed up. Let me know. jawshunting

I have used the same tool, and got consistent necks.

There was no option for me to use one of the hand tools, as I had 1,100 cases to turn,it STILL was a bitch!!).

I used the power drill attachment and a drill with a variable speed motor - I ran it about 1/3 speed,400-500 rpm??).

I dipped the neck into heavy grease before putting it in the collet. Then ran the running tool into the case, and feed it slowly. It was set to turn the neck, and trim when it came to the end of the stroke. It did it very well.

Necks came out uniform - it worked fine. I would do the same way again.

The way the tool is set up, it is impossible for "TOOL" to make the error - it is your technique... and bad technique will cause any tool to make an error.

When you turn a hand tool with a crank lever, there is a tendency for the user to push down harder on the down side, than they do when they pull up on the other side of the turn - this causes the tool to flex - just enough to cause an error of 0.0005",that's 1/2 a thou, Martha).

If you are not using a power attachment, then this might help - set the tool at a 45 degree angle on the bench, and place your arm so the section from the hand to the elbow is in a straight line with the shaft of the tool... this way when you are turning the crank - the pressure will be uniform for the whole 360 degrees of the turn.

I hope that the above helps you. This tool can do really good necks, and if you are turning a lot of cases, it is the only way to go.



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[billmo]

Gunamonth, I stand corrected. I just have never been able to get that consistent with turning necks. But, I'm learning. That's what counts. Thanks, Bill