Making Copper Bullet Jackets: Machining Punching & Drawing Dies! Part 6
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- Опубликовано: 13 сен 2024
- This Video:
Precision boring the ID hole to 0.704" and then polishing! We want a mirror surface finish on the steel to help with die performance, so we need to experiment with ways of polishing (e.g. sandpaper, abrasive compounds) and then we need to determine how much material the polishing process removes so that we can maintain critical dimensions on certain polished parts!
This Series:
Having been a long time shooter and reloader, I am undertaking my next project for my new Emco V13 lathe: Making Copper Bullet Jackets. The process steps are to blank a copper coin out of a strip of copper, cup it, then draw it in to progressively longer and thinner-walled shapes. The goal in this project is to end up with a 9MM jacket which will be about 0.6" long and 0.352" in diameter. That jacket can then be used in a swaging system (e.g. Corbin) and combined with a lead slug to make an actual bullet!
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Yeah that Brad is clear full of helpful hints. He's bailed my ass out at least a couple of times :)
I enjoy watching this
Boring is arguably more difficult then threading when you have small tolerance and low tapper allowance. The most important factor to maintain a consistent cut is even loading on the boring bar. That means you must not have any radios or bell mouth at the start and avoid pausing or changes of feed. Changes of the loading will alter the flex of the bar and subsequently result in tapers, undesired and unpredictable diameters, as well as chatter.
Hi,
If you're looking for an accurate cut with a carbide insert, you should know that it will cut exactly what is dialed in if you take a cut that is 2 times the diameter of the tip radius of the insert.
Meaning that you have an insert with a tip radius of .016 inch and make a cut of .032 inch, you can be sure that the actual cut will be .032 inch. A heavier cut like .100 inch will give you a more like a .103 inch or so. And a lighter cut will give you less than the dialed in cut and most of cases as you try to sneak in it will most of the times get a huge cut as it will all of a sudden grab all the sneaking and more.
The best way to achieve the rated cut is, 1st to measure exactly where you're at and, 2nd do the 2 last passes at exactly 2 times the radius of the insert, in most cases I get within 3 to 5 tenth from the desired goal.
For finishing or smaller works you can use .007 radius inserts.
Thanks for your involvement and good videos.
Hi,
That's what I've learned and by experience it is what I'm getting.
If you want to try it's easy: Find out what is the radius on your insert ex. a TNMG 332 will have a radius of 1/32nd. of an inch, indicated by the 3rd. digit (2) indicating how many 64th. of an inch is the radius ie. 2 times 1/64 = 1/32inch = .032inch, with that insert if you dial a cut .064inch you're assured to get .064inch within half a thousand.
To do finish cut with a nicer finish that's the way to go. To deal with smaller cuts you can get inserts with radius as small as .004inch.
About the .103inch, the fact you're cutting more dialing a bigger cut, it's because the insert dives in more due to pressure.
You have to be carefull choosing your inserts depending if you do mostly bigger or smaller cuts.
If you need more explanation just let me know.
I never have any luck with those boring bars. A good sharp HSS would do just fine. Love the videos !
Yep I seen the little marks this is very interesting
Why do you use lubrifiant when you use your carbide tools? It doesn't need it and your chips wouldn't stick as much. Keep on making videos, they're awesome!
when sanding, use a lubricant, it will drastically prolong the life of the sandpaper. Basically it prevents the paper from clogging.
The camera view is melting my brain :)
As for your boring finish, I had some horrible luck using the same type of boring bar in aluminum, and the main problem was due to the geometry ground into those brazed inserts. That may not be the case with your 1144 though :(
I got some great tips from the online community, my before and after are at: v=wYohs6Hk3MQ
That's why carbide tools are awesome because you can set your RPM 4 times faster, use no lubrifiants and remove a lot of steel in one pass (in theory the lenght of the carbide but your lathe will probably not like it)
I’m watching part 5 was interesting
Snap gushed measure in millions
Yeah the first angle made me want to tilt my head :) but other than this it's once again a realy interesting video! thank you so much!
lol I saw it and can't wait to see it on the Emco!
Download VLC. Open VLC , select Media and choose Open Network Stream. Copy and paste the URL of the RUclips video you wish to rotate. If the video is saved on your computer, click on Open File and select the video instead. Click tools>effects and filters . Click Video effects then geometry. Select transform and select rotate video by 90 degrees. Enjoy.
the camera needs to be rotated 90 degrees CCW, doesn't matter though, i would watch even if it was upside down :)
I find if you go in the hole with a couple of thou and rev the direction the tapered cut will be a nice finish. give it a shot next time .peace
It’s a telescoping guage
I'm no machinist, but when using the boring bar, could you not have bored all the way through and then blow the chips out from the inside?
If you are using the cheap brazed on carbide boring bars, they are horrible and leave a terrible finish in steel. Part of the problem is that the cutting geometry is too sharp. Also with carbide, it like heavy cuts to get a nice, consistent finish. It would be worth investing in a set of replaceable carbide insert boring bars if you are doing a lot of boring operations.
John NYCCNC
This set offers a fair price with a steady set of boring bars with various size diameters. They also come with extra coated carbide insets.ebay "dot com"/itm/1-2-5-8-3-4-SCLCR-INDEXABLE-BORING-BARS-INSERT-CCMT-SET-/330365777343?pt=BI_Tool_Work_Holding&hash=item4ceb55b5bf
Use 1050 it gives you an amazing finish
You could probably sell these kits given the line-ups at Walmart :P
hehehe, well im swedish and can actually understand what he saids.. But yeah that geordie accent is really thick. :D
he's active on the madmodder ( * net ) forum. =)
Is it just me, or does it almost seem like hes using a lathe in a 0G environment?! lol
Ya love the videos but hated the new angle :)
Camera angle is making me sea sick :(
Guages
Rotate that camera 45 degrees and you’ll be solid
Edit: eh, maybe 60 degrees
Check out doublboosts "skyhook".. he solved the camera issue once and for all. =D
Camera angle gave me a stiff neck. Other wise a good video...
NEVER USE A RAG,ALL YOU NEED IS A SMALL BURRRR AND THAT RAG IS IN PLAY. BE SAFE BROTHER.. PEACE
not a fan of the camera angle.
Not a fan of the camera angle, i keep re-orienting my head