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Posted: 5/8/2020 3:23:27 PM EDT
The can launcher thread has a pretty neat solid projectile that fmj_shooter has printed. Just wonder if anyone had done something similar only with a driving band for 40mm and to fit in an M212 or similar case?
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Posted: 5/8/2020 3:39:51 PM EDT
[#1]
I've seen hollow 40mm rounds (M781 dimensions) tried but no solid projectiles yet. Seems like they wouldn't be very stable at all.
That aside - thanks for bringing that can cannon projectile to my attention! That's a fun and clever use of 3d printing. Bullet Bill ought to be black and not blue - but what fun! |
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Posted: 5/8/2020 3:49:14 PM EDT
[#2]
I'd buy some!
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Posted: 5/8/2020 4:09:03 PM EDT
[#3]
I've been testing some, even this morning. They just always seem to blow through the middle with standard m212 cases and blanks. Gonna try some more later today. Had slightly better luck reenforcing them with jb weld.
Seems like Delrin projos made on a lathe will always be the strongest. But I havent given up yet. I did print a shot cup for my can cannon and it works well |
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Posted: 5/8/2020 4:10:16 PM EDT
[#4]
And just for mention, the army did have success printing driving bands onto aluminum or steel m203 projectiles with an FDM printer
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Posted: 5/8/2020 4:10:32 PM EDT
[#5]
Duplicate post
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Posted: 5/9/2020 2:04:34 PM EDT
[#6]
Quote HistoryOriginally Posted By SGT-Fish: I've been testing some, even this morning. They just always seem to blow through the middle with standard m212 cases and blanks. Gonna try some more later today. Had slightly better luck reenforcing them with jb weld. Seems like Delrin projos made on a lathe will always be the strongest. But I havent given up yet. I did print a shot cup for my can cannon and it works well If you post a few pictures of the failures I may be able to help. I have some experience with much larger pushers and there is definitely a way to get them to work. |
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Posted: 5/9/2020 2:20:33 PM EDT
[#7]
I'll try to get some posted up tonight. I did get one to go downrange and hit my berm, though a few pieces of plastic came off. Part of the problem is how the m212 case directs the high pressure straight into the back of the projectile. It would be much easier if I were to reload the short flare style cases that vent the gases sideways from the HP chamber to the LP chamber. They are much easier on the projectiles. I have an idea on how to reload them, but it'll take some free time at work on the lathe
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Posted: 5/9/2020 5:48:15 PM EDT
[#8]
A thin piece of metal on the back of your projectile should also help in this instance. Most of your FDM printed plastics don't like getting hit directly with a jet of combustion gases.
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Posted: 5/9/2020 7:32:47 PM EDT
[#9]
Quote HistoryOriginally Posted By SGT-Fish: I'll try to get some posted up tonight. I did get one to go downrange and hit my berm, though a few pieces of plastic came off. Part of the problem is how the m212 case directs the high pressure straight into the back of the projectile. It would be much easier if I were to reload the short flare style cases that vent the gases sideways from the HP chamber to the LP chamber. They are much easier on the projectiles. I have an idea on how to reload them, but it'll take some free time at work on the lathe Let me tinker with a 40mm case. I'll see if I can make one of the eXact iMpact reloadable cases divert the gas to the side via a number of ports while blocking the usual top vent. If I can, I'll send it to you for further experimentation. |
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Posted: 5/23/2020 1:52:57 AM EDT
[#10]
This thread is relevant to my interests.
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Posted: 6/24/2020 8:08:40 PM EDT
[#11]
https://youtu.be/-tpATme17sY
Got this one to work. I'll be trying higher power blanks soon to figure out the right combination. I will keep posting my progress as I go. So make sure you stay tuned. I will share my findings and may even spread the stl files to those that want it for personal use (like I did with my nosecone file).  Failed To Load Title |
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Posted: 6/24/2020 8:27:52 PM EDT
[#12]
Quote HistoryQuoted: https://youtu.be/-tpATme17sY Got this one to work. I'll be trying higher power blanks soon to figure out the right combination. I will keep posting my progress as I go. So make sure you stay tuned. I will share my findings and may even spread the stl files to those that want it for personal use (like I did with my nosecone file).  https://www.youtube.com/watch?v=-tpATme17sY
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Posted: 6/24/2020 8:54:50 PM EDT
[#13]
Send me your email address in a pm. Or post it here. I'll try to send it tonight. I just make sure everyone knows that it's for non-commercial use only. No selling it or cones made from it.
I'm hoping to eventually put together a file pack of 40mm stl files to share on the internet. I have a decent number put together already. Things like this projo just need more testing and precise directions on what blanks to use whatnot. |
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Posted: 6/24/2020 9:56:38 PM EDT
[#14]
Quote HistoryQuoted: Send me your email address in a pm. Or post it here. I'll try to send it tonight. I just make sure everyone knows that it's for non-commercial use only. No selling it or cones made from it. I'm hoping to eventually put together a file pack of 40mm stl files to share on the internet. I have a decent number put together already. Things like this projo just need more testing and precise directions on what blanks to use whatnot. |
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