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Thread: Ball micrometers?

  1. #46
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    Lightbulb Hey Al...........

    My carbide neckturning mandrels seem to leave a very smooth "burnished" neck interior. Also, K&M offered some carbide mandrels with an integral "doughnut" cutter. They work very well for me.

    Your thoughts?

    As far as "tenths" are concerned......

    Didn't Paul Marquart advertise his tool to turn "within a tenth"........over four decades ago??!!

    Kevin

  2. #47
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    Quote Originally Posted by Kevin Gullette View Post
    My carbide neckturning mandrels seem to leave a very smooth "burnished" neck interior. Also, K&M offered some carbide mandrels with an integral "doughnut" cutter. They work very well for me.

    Your thoughts?

    As far as "tenths" are concerned......

    Didn't Paul Marquart advertise his tool to turn "within a tenth"........over four decades ago??!!

    Kevin
    My thoughts are that the "smooth and burnished necks" are awesome fine. I'm not saying they'll measure "within a tenth" in THICKNESS all over the necks using a ball and mandrel setup, but they're fine.

    IMO "within a tenth" refers to repeatability, like neck-to-neck. Which, with proper fittage and a properly ground cutter they should all do.... provided you keep everything at an even temperature. I turn in a cookie sheet with a flat tupperware container of room temperature water to drop my cutter into between cuts. Some will say that a loose-fitting mandrel is OK because "the cutter presses the case against the mandrel anyways" but I disagree. Nor is an overly tight fit best IMO.

    I look at neck turning tools the same way I look at sizing dies....... ie "it's neither the brand nor the precision, nor the stiffness, nor the angular danglagure...... it's all in the FIT of the components"

    And in the handling.

    One of my early custom purchases was a turner built by Art Cocchia and I asked him "why is this thing so BIG? It's like 5 times as big as my K&M!"

    And his reply was...... pithy.

    "well, it's easy to hold isn't it?"

  3. #48
    Join Date
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    Bulk in a neck turner is about heat dissipation, pure and simple.
    Here’s your K&M with carbide fluted mandrel.
    Plus heat dissipator.
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  4. #49
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    Quote Originally Posted by Kevin Gullette View Post
    Didn't Paul Marquart advertise his tool to turn "within a tenth"........over four decades ago??!! Kevin
    Hey Kevin...hope all is well with you and yours.

    Every one of the neck cutters I've used (K&M, Sinclair, 20th Century, etc) will turn to that tolerance, provided two things are met:

    - A mandrel that truly fits the neck
    - Consistent temp for the cutting tool

    When cutting necks, I fill a plastic bowl with cheap rubbing alcohol and drop the turner into it after each case.

    More important is the mandrel fit to the necks. Inside case necks are often neither round or free of taper from top to bottom. And if they've been necked up or down, you can darn sure be assured they aren't. Making the case neck I.D. round and taper free is worth the effort, for me. Once that's done, a close fitting mandrel can be used w/o excessive heat build up. Steel works as nice as carbide when you're cutting a truly round neck I.D. on a truly round mandrel.

    I'd never say it makes a difference 'on target', though.....

    But the discussion was ball micrometers, wasn't it?

    Good shootin'. -Al

    P.S. A decent set of gauge pins should be a part everyone's neck turning tools.

  5. #50
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    Tell me what you see wrong with this tool.
    https://www.youtube.com/watch?v=QOjE...0#action=share

  6. #51
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    Quote Originally Posted by Butch Lambert View Post
    Tell me what you see wrong with this tool.
    https://www.youtube.com/watch?v=QOjE...0#action=share
    I saw that a few days ago...pretty slick. But, it's only as good as the setup and bearings in the machine, plus...his mic didn't read in tenths.

  7. #52
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    Lightbulb Ok Butch.......

    ......I'll take a "shot".

    The axially fixed case assumes a case body/case neck concentricity.

    No allowance for case "banana" effect.

    What do I win.......or lose??

    Kevin

    P.S. Al N. All is well here....but still a bit hot. I see you're still burn'in up the strip. Take care.
    Last edited by Kevin Gullette; 09-27-2019 at 03:19 PM. Reason: add

  8. #53
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    Quote Originally Posted by Kevin Gullette View Post
    ......I'll take a "shot".

    The axially fixed case assumes a case body/case neck concentricity.

    No allowance for case "banana" effect.

    What do I win.......or lose??

    Kevin

    P.S. Al N. All is well here....but still a bit hot. I see you're still burn'in up the strip. Take care.

    Tolerance stacking. Al has already mentioned reaming the inside of the necks to smooth them before outside turning. I bought reamers to do that, but found it was a waste of time and money.

  9. #54
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    Quote Originally Posted by mwezell View Post
    I saw that a few days ago...pretty slick. But, it's only as good as the setup and bearings in the machine, plus...his mic didn't read in tenths.
    Solution to a problem that does not exist. Especially boring the inside of the neck, which usually causes more problems than it is expected to cure.

    There is no way he can get as fine of a finish with that as comes in a extruded case neck.

    Here is my way. Of course, it helps to have a Monarch EE with a turret attachment.

    https://m.youtube.com/watch?v=xykoVHY_Lkc
    Last edited by jackie schmidt; 09-27-2019 at 07:06 PM.

  10. #55
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    Quote Originally Posted by jackie schmidt View Post
    Solution to a problem that does not exist. Especially boring the inside of the neck, which usually causes more problems than it is expected to cure.

    There is no way he can get as fine of a finish with that as comes in a extruded case neck.

    Here is my way. Of course, it helps to have a Monarch EE with a turret attachment.

    https://m.youtube.com/watch?v=xykoVHY_Lkc
    I use to do them the same way. It's a hard way to beat.

  11. #56
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    Not to be argumentative, but as someone with background and family in mfg, "extruded" means something. And cartridge case necks aren't it

    Cases are hammered from a button, brought up to a deep cup, trimmed and then simply necked down in a die. Anything extruded MUST be tubular and parallel.

  12. #57
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    Wow!!!!
    The season not even over yet!

  13. #58
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    Quote Originally Posted by Tim Singleton View Post
    Wow!!!!
    The season not even over yet!
    WOW!!

    So Tim,

    start a topic, show us all how to discuss it,

    your way.

    Teach us all something beyond


    WOW!!



    How do you neckturn? And why?

  14. #59
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    Apr 2012
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    Waynesville. NC
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    Quote Originally Posted by alinwa View Post
    WOW!!

    So Tim,

    start a topic, show us all how to discuss it,

    your way.

    Teach us all something beyond


    WOW!!



    How do you neckturn? And why?
    Pardon the interruption
    Apologies

  15. #60
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    Dec 2003
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    washington.........STATE that is.
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    Why does it have to be that way?

    All's I'm saying is...... discussion is how we LIVE

    Today my kid called..."ooops! I turned the skiddy over in my yard, what do you want me to do?"

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    So I called around..... and asked my friends...... and we DISCUSSED...... sometimes we disagreed.......



    "just hook your Suburban to it and get a running start with a 50ft strap"
    "better bring out a dozer and a cable"
    "need at least a 20,000lb machine to get that up"
    "best call a wrecker"
    "offroad forklift there...."

    etc etc

    And then, once't we got 'er up the REAL fun starts;

    "SO FAH'R IT UP!"
    "NO!!!! NOOO!!!"
    "pop the injectors and run 'er backwards for 30seconds"
    "Drain the pan"
    "let 'er sit overnight THEN fire"
    "better drain back the fuel"
    "better push the fuel thru"
    "better disconnect all the lines and re-prime"
    "you got oil all up in the cylinders now, better pull the head"

    and so on....

    But ain't none of it BAD This is just how we get stuff DONE in my life!

    This is what I thought forums were for

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