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Thread: Pinch Die

  1. #1
    Boolit Master


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    Making a Pinch Die

    Forming the ogive on some 6mm bullets I am making from 22 mag brass gave me fits!
    One of the problems was that the length of the cases were different sizes I used a HF mini saw to cut them but they must moved in t jig.
    I printed a picture of Corbin’s pinch die and made a print frame m it and will soon be in the shop making chips!
    Last edited by deltaenterprizes; 08-10-2020 at 09:57 AM.

  2. #2
    Boolit Master

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    Nice, looking forward to reading about the details.
    To lazy to chase arrows.
    Clodhopper

  3. #3
    Boolit Bub
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    i had the same problem years ago when i was making bullets. the pinch die is the way to go.

  4. #4
    Boolit Buddy

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    how does the pinch die work?

  5. #5
    Boolit Buddy
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    Looking forward to hearing/seeing your progress with the pinch die. Best wishes.

  6. #6
    Boolit Buddy
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    i'd like to know more. is length of the jacket the only issue your having ? what are you trying to make. what's causing you fits ?
    Good Judgment comes from Experience, Experience comes from Bad Judgment !

  7. #7
    Boolit Master


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    Quote Originally Posted by nun2kute View Post
    i'd like to know more. is length of the jacket the only issue your having ? what are you trying to make. what's causing you fits ?
    Making 6mm/243 Bullets from 22 mag brass, the varying lengths cause a problem when forming the ogive.

  8. #8
    Boolit Master

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    A pinch die trims jackets, when used right makes them uninform length.

    The die pinches the brass between upper and lower parts. Set to tight wrecks the pinch edge, set to loose, does not pinch the jacket off.
    To lazy to chase arrows.
    Clodhopper

  9. #9
    Boolit Buddy
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    hollow point, open tip, spire point ?
    getting wrinkles ? I've not tried the mag brass, but the LR brass is real easy to wrinkle if it doesn't have lead behind it to help mash it over the ogive. the lead kinda supports the brass from wrinkling.
    keep us posted on your progress
    Good Judgment comes from Experience, Experience comes from Bad Judgment !

  10. #10
    Boolit Master
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    Quote Originally Posted by deltaenterprizes View Post
    Forming the ogive on some 6mm bullets I am making from 22 mag brass gave me fits!
    One of the problems was that the length of the cases were different sizes I used a HF mini saw to cut them but they must moved in t jig.
    I printed a picture of Corbin’s pinch die and made a print frame m it and will soon be in the shop making chips!
    Some photos would be helpful, or a link to photos elsewhere. I'm quite interested!

    Bill

  11. #11
    Boolit Master


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    Google Corbin pinch die and it will come up, that is how I found it.
    I am not very skilled with all this new fangled electronic wizardry!
    I just read email and surf the web!

  12. #12
    Boolit Master



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    Quote Originally Posted by bigjake View Post
    how does the pinch die work?

    Hopefully this picture will show you and the several other People with the same question on how it works:

    Click image for larger version. 

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    See the exposed portion of the case/jacket being split? The cone of the punch then "Pinches" the case in a total circle where the cone of the punch meets the rim of the die (case/jacket inside the die); cutting the excess length of the jacket off.
    Mustang

    "In the beginning... the patriot is a scarce man, and brave and hated and scorned. When his cause succeeds, the timid join him, for then it costs nothing to be a patriot." - Mark Twain.

  13. #13
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    I am pretty sure in that picture that the punch is being withdrawn. The jacket is already split/creased at the desired length. Wiggling the split Portion of the case will cause it to break free from the case.

    Here’s a set of pictures and instructions on using the dies. http://www.corbins.com/et-2-s.htm

    I made a pinch trim die for 7mm jackets and it works very well. You will need to heat treat the base punch at the least, since it has the sharp edge. I heat treated both punches. I used a steeper angle on the punch and my brass splits into about 6 petals. Most stay attached to the case until they are wiggled and then break free. If you were doing a lot of brass, I would think that you could tumble the cases to break the petals also.

  14. #14
    Boolit Master


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    Quote Originally Posted by garandsrus View Post
    I am pretty sure in that picture that the punch is being withdrawn. The jacket is already split/creased at the desired length. Wiggling the split Portion of the case will cause it to break free from the case.

    Here’s a set of pictures and instructions on using the dies. http://www.corbins.com/et-2-s.htm

    I made a pinch trim die for 7mm jackets and it works very well. You will need to heat treat the base punch at the least, since it has the sharp edge. I heat treated both punches. I used a steeper angle on the punch and my brass splits into about 6 petals. Most stay attached to the case until they are wiggled and then break free. If you were doing a lot of brass, I would think that you could tumble the cases to break the petals also.
    I made a copy of ET-2, I can’t get a good look of the end of the cone shaped part to finish the end.
    Can you post a picture of yours or send me a pic?

  15. #15
    Boolit Master


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    I talked with a mechanical engineer friends of mine and he suggested that the best top punch angle on the end would be 45 degrees.

  16. #16
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    My punch has about a 30 degree taper down to the inside diameter of the jacket. The straight part at the tip is about 1/4” long and serves to make sure the jacket is pushed all the way into the die before the case is expanded and pinched. The outer diameter of the punch doesn’t matter much, it is probably about 1/2”. I will try to post a couple pictures.
    Last edited by garandsrus; 08-10-2020 at 05:11 PM.

  17. #17
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    Here are some pictures:

    Trim punch
    Click image for larger version. 

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    Case ready to enter die body. It is pushed in by the trim punch
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    Case fully seated in die body, trim punch backed out to show length getting trimmed off
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    Bottom of trim stroke
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    Ejected
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    Ejected and petals snapped off
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    Last edited by garandsrus; 08-10-2020 at 05:12 PM.

  18. #18
    Boolit Buddy
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    Great pictures Garandsrus and thanks for sharing.

  19. #19
    Boolit Master


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    Thanks you sir!

  20. #20
    Boolit Master


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    We had some cool and dry weather so I was able to harden the pinch die parts today!
    It works like a charm!
    Before I hardened the parts the cutting edge would roll and the die would not cut now it works!

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