cut off jigs

[too many things]

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 .

[Mr_Sheesh]

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.

[Mk42gunner]

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

[ndnchf]

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

https://youtu.be/7unEiiPN860

[salpal48]

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

[jim147]

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.

[Mr_Sheesh]

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)

[577450]

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.

[country gent]

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

[Mr_Sheesh]

I posted in the 3D printing subforum, https://castboolits.gunloads.com/forumdisplay.php?329-3D-PRINTED-RELATED-ITEMS, at https://castboolits.gunloads.com/showthread.php?424501-300BO-and-45-ACP-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

[444ttd]

i use for any x57 cases in my hf cut off saw....

https://elite3ddesign.com/products/8mm-mauser-cut-off-trimming-jig-auto-ejecting-brass-case-trimmer

[Mr_Sheesh]

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.

[imashooter2]

This one is for 300 BLK.

282402 282403

[Mr_Sheesh]

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?)

[Conditor22]

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

[Mr_Sheesh]

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 :)

[444ttd]

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.

[imashooter2]

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.

[1hole]

Ref. Harbor Freight tools, I have quite a few of them simply because they are great for my occasional needs. I have a young nephew who buys HF tools because he can afford them; like me, he can afford them because they're low cost devices that he could not otherwise rightly justify buying. BUT, he then complains that they're cheeply made and really aren't professional quality tools built for precision work and long life. Welll ... he drives an Amazon warehouse forklift for a living and he ain't a "professional" anything so ....! ??? ;)

In the early 70s I made a lot of .22-250 cases from 1942 military .30-06 because the first factory .22-250 cases were still hard to find and it allowed me to make cases tightly fitted to my then new Sako/Browning Safari's (with an also new 20x 1 1/2" Unertl varmint scope) factory chamber. Wish I'd had one of HF's little chop saws back then.

HF's little plastic frame "chop saw" is great for occasional light work but it isn't intended for cutting 1/2" rebar all day. Like any other tool, if you actually need one get it, use it correctly - and within its obvious limits - and it'll probably do you fine.

[Mr_Sheesh]

If someone's criticizing their own life choices, I might agree with them then ask when they're going to start making better ones on rare occasion, or just not comment; I certainly am not too likely to argue with them though LOL

I made ~3 or 4k 243 cases out of 308, and while that required other tools, annealing & reaming at 25-08 mainly, it certainly didn't need a chop saw. I had a power hacksaw at that time, but using that for trimming 308 to 45 ACP shotshells a few years later would have been silly. Wish my arms worked as well now as they did then, arthritis is not helpful. So I am glad to have my lil chop saw now.

[Handloader109]

I'm working on making 7x57 mauser from 30-06 and I quickly designed and printed a holder for the cases to use with the little chop saw. yeah finish is poor, but cleaned them a bit, resized and then cut off extra 29 to 30 thou with my new Lyman. super trimmer. Nifty trimmer. now all within a thou or two of right length

Sent from my SM-G892A using Tapatalk

[AndyC]

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 .
Who is it? I'd like a jig to cut off .308 brass but I'm only seeing the usual 300 Blk etc.

[Mr_Sheesh]

Search for what you're turning the 308 brass INTO, as that is how they're listed. 45 ACP shot shells or ????

[Jsm180]

I'm using one from Zep Reloading for 300AAC, works good. https://www.zepreloading.com/store/c1/Featured_Products.html

[AndyC]

Search for what you're turning the 308 brass INTO, as that is how they're listed. 45 ACP shot shells or ????
.44 Automag, but there's nothing listed. I had understood that it was a custom maker from what the OP said "there is guy on the bay that makes a 3D cut off jig in anything you would want" so I wanted to contact that guy and ask directly.

[Mr_Sheesh]

I need to get my 3D printer finished then I can just print things like that. If you have access to a 3d printer I could get a stl file for that made in 15 minutes tops LOL

[AndyC]

Thank you :) I know a few guys who have printers.

[Mr_Sheesh]

I went ahead and set up the file, 1.3" cut-to length vs 1.25" for 45 ACP shotshells, pretty easy. If you PM me an email address I can email you an STL file for it, be sure to let me know if you want it set to cut off at 1.3" or a bit longer. (I scale my stls to "1 unit = 1mm" but have a conversion function in there because it's handy :) )

[AndyC]

Oh, thank you so much - sending a PM now.

[BrassMagnet]

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)


I could use one for 45 ACP shotshell!

[Mr_Sheesh]

Aah, I already have that one set up. I should set up stls for the ones I've done, right now it's all in one OpenSCAD file so I just turn each jig on/off with a switch (set it to true to print / false to not print.)

If Thingiverse would tell me why I can't log in and can't get a password change request reply it'd help, worst case I can make another account there but I'd have to use another email. Nice to keep things mostly on one email :)