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Thread: cut off jigs

  1. #1
    Boolit Master
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    cut off jigs

    there is guy on the bay that makes a 3D cut off jig in anything you would want nice set up
    not here to promote just to inform .

  2. #2
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    Easy enough to DIY one, either with a 3D printer, or even with wood with a table saw or plastic with a milling machine or lots of other possibilities.

    Ideal one would fit the case like a glove - but as you'll trim the case again after initial forming, you could use something semi rough to do the initial cutoff.

    I might do a design for a jig, going to be getting into 300BO and want another jig design for 45ACP shot shells. There is a 3d subforum under special projects, if interested.

  3. #3
    Boolit Grand Master
    Mk42gunner's Avatar
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    When I used my mini chop saw to cut off case necks for making shotshells, I cut the first one sort of held in the vice. then I used the cutoff portion to position the rest of the lot.

    Precise? No. Useable since the cases needed to be ran through a case trimmer anyway? Yes.

    What would be neat is if you could make a push through jig that indexed length properly.

    Robert

  4. #4
    Boolit Master

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    This is a short video showing the fixtures I use in the HF chop saw. They work great for me.

    https://youtu.be/7unEiiPN860

  5. #5
    Boolit Master
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    I purchased a couple mainly for 577/450, 577 snider. They are made mostly accurate the bad part is the HF saw . Most are out of Square and there adjustments are not overly accurate. I try cutting them a close as possible cut, them Trim on a trimmer
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  6. #6
    Boolit Buddy
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    My little brother has been making them for years out of wood blocks. Drill a hole, cut in half and slot for a rim if needed. I think I have a .300 blackout and a .38 S&W around here somewhere.

  7. #7
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    About half way done making OpenSCAD files for them, have it making the cartridges with the cutoff "nicks" as a disk in the right place, next I just need a few lines to rotate those and remove that volume from the fixture, important thing is making the dimension numbers right

    (for 300 BO trim and 45 ACP Shot shell trim jigs)

  8. #8
    Boolit Mold
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    thanks for that video.
    The harbor freight saw will cut clean enough that trimming is not needed to square it up, but I had trouble
    rotating the case for Sniders and such with a normal jig. This looks like the answer to large diameter cases.
    I tried the 3 inch cutoff wheel, but it was nowhere near the saw blade. Way slower and just stunk the place up.

  9. #9
    Boolit Grand Master

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    You might consider a keyed base for the jig. this could be held down and the key locates the jigs in place

  10. #10
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    I posted in the 3D printing subforum, https://castboolits.gunloads.com/for...-RELATED-ITEMS, at https://castboolits.gunloads.com/sho...SS-cutoff-jigs, showing my jigs as they stand.

    My 3D printer isn't built yet, but that is coming soon

    I can pass someone STL files if they want Or design you another one for a different case, I would need some measurements is all (Base diameter, Rim diameter, case length to shoulder, case length to base of neck, neck diameter, pretty obvious, if your case isn't a SAAMI standard one.)

    Any jig that does the job is a good jig, I just like the idea of exactly fitted custom ones. Engineering folks -rolls eyes- LOL

  11. #11
    Boolit Master 444ttd's Avatar
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    i use for any x57 cases in my hf cut off saw....

    https://elite3ddesign.com/products/8...s-case-trimmer
    The leading Bolsheviks who took over Russia were not Russians. They hated Russians. They hated Christians. Driven by ethnic hatred they tortured and slaughtered millions of Russians without a shred of human remorse. It cannot be overstated. Bolshevism committed the greatest human slaughter of all time. The fact that most of the world is ignorant and uncaring about this enormous crime is proof that the global media is in the hands of the perpetrators. ~ Aleksandr Solzhenitsyn

  12. #12
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    I've seen people using jigs like mine, push the next case in, shoving the previous one out of the way. I could do a retainer clip like that though, its a good way to do it, that would require you to insert and pull the cases out, all on the same side, seems slower possibly.

  13. #13
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    This one is for 300 BLK.

    Click image for larger version. 

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    My Straight Shooters thread:
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  14. #14
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    I can tell that you're sizing the case w/o the inside neck sizer ball present there Do you find that more advantageous than just cutting the 223 once fired (or new) case, then sizing? Seems like more work, potentially, is why I ask. (To get the right inside neck dia. you'd have to re-size the brass again, I'd think?)

  15. #15
    AKA: GRMPS Conditor22's Avatar
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    sizing after cutting will change the OAL -- you have to take that into consideration

    Sizing before cutting all you have to do is get your OAL right + a couple of thou to trim down to exact size and square

  16. #16
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    Knew that, measure 4 times, cut once, then trim My trimmer has a motor on it, part of why I'm not too scared about a little trimming

  17. #17
    Boolit Master 444ttd's Avatar
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    Quote Originally Posted by Mr_Sheesh View Post
    Knew that, measure 4 times, cut once, then trim My trimmer has a motor on it, part of why I'm not too scared about a little trimming
    +1

    i have the power adapters for my forster and lyman case trimmer.
    The leading Bolsheviks who took over Russia were not Russians. They hated Russians. They hated Christians. Driven by ethnic hatred they tortured and slaughtered millions of Russians without a shred of human remorse. It cannot be overstated. Bolshevism committed the greatest human slaughter of all time. The fact that most of the world is ignorant and uncaring about this enormous crime is proof that the global media is in the hands of the perpetrators. ~ Aleksandr Solzhenitsyn

  18. #18
    Boolit Grand Master

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    Quote Originally Posted by Mr_Sheesh View Post
    I can tell that you're sizing the case w/o the inside neck sizer ball present there Do you find that more advantageous than just cutting the 223 once fired (or new) case, then sizing? Seems like more work, potentially, is why I ask. (To get the right inside neck dia. you'd have to re-size the brass again, I'd think?)
    I saw a video on the web that sized first, trimmed to exact length with the HF chop saw and then put the expander ball back in and ran the cases as normal. His pitch was no deburring (die knocked off the burrs), no final trim and no annealing, so faster and easier.

    I tried it on 20 cases and didn’t like the finish the saw cut gave me and was iffy about the no deburring. I now do the traditional cut, anneal, form and final trim.
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