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Thread: Neck Turning on lathe?

  1. #1

    Neck Turning on lathe?

    Fancy neck turing my brass for my 204, i dont have a trimmer so thinking on trying it on my lathe. Has anyone ever tried it on a machinist lathe?

    Cheers
    Geordie

  2. #2
    Are you thinking of making a mandrel/insert for the neck that can be supported on a live centre? It might be quite fiddly to clamp the case in the chuck, as it will be tapered. Probably need a 4 jaw chuck too?

    Sounds like a lot of work.

  3. #3
    Mandrel does not need to be live, a thou undersize works. As to chuck, best is to modify a collet or even turn up a split collet for the 3 jaw.
    Bottom line it is a pain in the arse, I decided to inside neck ream in a modified fl sizing die much easier.
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  4. #4
    I would make a mandril pin that locks into the flash hole and is snug with a fire formed case. Holding it in the chuck shouldn't be too much of a hassle, the cae head should sit in the teeth of the chuck making for a repeatable system.

  5. #5
    I would question the need to turn the necks on 204, especially for a factory chambered rifle. Is there accuracy problems? If I did want to do it and had a lathe, I would use the lathe to make a hand held neck turner as are marketed from various manufactures. FWIW, having turned necks on a lathe, the way I was taught to do it is to turn an oversized straight mandrel onto which the cases are pressed using the tailstock. The brass is then resized after turning. A real pain in the hind quarters.~Muir

  6. #6
    No accuracy is pretty good for the best part atm it's on the poor side but I have narrowd it down to poor mounts (new scope and mounts are on there way). I'm starting to stretch the legs the rifle, mostly long range crows circa 500yrds + and I want to get the loads down pact even I'f it's only .2 of an MOA that will make all the difference at 500. The hand made neck turner sounds interesting! Any link of picture could follow for ideas?

    Cheers

  7. #7
    Quote Originally Posted by Hunter686 View Post
    No accuracy is pretty good for the best part atm it's on the poor side but I have narrowd it down to poor mounts (new scope and mounts are on there way). I'm starting to stretch the legs the rifle, mostly long range crows circa 500yrds + and I want to get the loads down pact even I'f it's only .2 of an MOA that will make all the difference at 500. The hand made neck turner sounds interesting! Any link of picture could follow for ideas?

    Cheers
    No particular pic but if you bore out a piece of material (steel or aluminum... anything) just larger than the 204 body, drill the center for a mandrel of the desired size, then mount a piece of tool steel at right angles to the mandrel with a grub screw to set it's depth (feeler wires between mandrel and cutter) you'd have one built PDQ. Use the lock stud for a .223 Lee Trimmer to hold the case while trimming.

    Food for thought: A buddy ordered a custom Lee Factory Crimp Die for his 20 Practical. Shrunk his groups to bug holes. Lee will make one for the 204 at a cost of $31 US plus shipping. Smaller ES and SD with no fuss....~Muir

  8. #8
    I did all my neck turning for 257 AI and 22BR on my lathe, i have a crawford collet chuck so selected a 15/32 collet and turned a backstop just slightly less on diametre then the case head diametre, this fits into the headstock morse taper and protrudes through the centre of the chuck and stops about a 1/16 short of the collet mouth, leaving just enough of the collet to hold on the the case rim.

    For the actually turning i used my K&N neck turner but fitted with a home made mandrel extended at the rear so it is about half an inch proud of the cutter frame and can be held in a jacobs chuck.
    The jacobs chuck is mounted in a dedicated quick change tool holder, the K&N cutter/mandrel is clocked up so that it is perfectly on the centreline of the lathe, the cross slide then being locked up.

    I insert the case rim into the collet with the casemouth about 1/8" onto the mandrel and tighten, this takes care of alignment, its then just a matter of setting a bed stop, adjusting the depth of cut and taking a pass.
    Once set up its remarkably quick,perfectly repeatable and an excellent finnish can be achieved.

    Ian.

  9. #9
    This is what I had in mind, I'm running a Colchester but the system will be very similar to what you are running. Thanks!

  10. #10
    Im running a Colchester Master MK 1 1/2 so if you need any set up tips feel free to PM me.

    Ian.

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