Amusing item to 3D print I found on thingiverse (26mm concrete pellet mold)

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jhereg Member Joined Apr 2005 Posts 27960 EE 100% (1) SOM	Posted: 3/2/2024 4:34:39 PM EDT https://www.thingiverse.com/thing:6179489 I had an amusing thought that this would be interesting to print this, cast them, and then shoot them w/ a printed sabot in a 37mm DD or 40mm. Attached File
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Gingerbreadman Just some guy. Joined Jan 2008 Posts 14589 EE 100% (1) MN, USA	Posted: 3/2/2024 8:39:24 PM EDT [#1] Neat. I wonder how well they stabilize out of a smooth bore barrel.
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jhereg

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Posted: 3/2/2024 8:47:57 PM EDT

[Last Edit: jhereg] [#2]

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Originally Posted By Gingerbreadman:
Neat. I wonder how well they stabilize out of a smooth bore barrel.

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They're shaped like a pellet which from what I've read is pretty stable. There's a stl to print the projectile itself there too. I've thought about printing some and experimenting w/ them. On the other hand I have too many projects right now so this is a neat idea and I might get back to it at some point.

One of the thoughts I had on those is they would be brutal to be near if you shot something hard like steel w/ them.

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jhereg Member Joined Apr 2005 Posts 27964 EE 100% (1) SOM	Posted: 3/3/2024 12:11:39 AM EDT [#3] Printed one to get an idea on the size. With a SD card adapter for size. It's loose in a printed 37mm shot cup. Attached File
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neight Member Joined May 2010 Posts 780 EE 100% (248) GA, USA	Posted: 3/3/2024 1:03:17 AM EDT [#4] Would casting something like this aluminum or zinc be practical and legal? I assume printing is popular because you get a uniform product without machining?

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Posted: 3/3/2024 1:52:43 AM EDT

[Last Edit: jhereg] [#5]

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Originally Posted By neight:
Would casting something like this aluminum or zinc be practical and legal? I assume printing is popular because you get a uniform product without machining?

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Should be able to cast it. I've read you can do lost PLA casting similar to lost wax but haven't done it. If you look at my link at the beginning the person who designed has molds you can print in PLA or TPU and cast them out of concrete. I printed that one to see how big it was and to be able to handle it and look at it.

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jhereg Member Joined Apr 2005 Posts 27966 EE 100% (1) SOM	Posted: 3/3/2024 1:57:10 AM EDT [#6] Thinking about the sample I printed and the shot cup it's sitting next to. I may scale it up a bit so it fits in the shot cup and see how that looks.
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uglygun Joined Nov 2000 Posts 40067 EE 0% (0) CA, USA	Posted: 3/3/2024 2:27:13 AM EDT [#7] I seriously need to make some fin stabilized bits for those giant big assed 9in roofing nails. Then fire them out of a pneumatic spud gun at 100psi.

mancow Member Joined Aug 2008 Posts 30771 EE 100% (8) USA	Posted: 3/3/2024 2:37:46 AM EDT [#8] Quote History Originally Posted By uglygun: I seriously need to make some fin stabilized bits for those giant big assed 9in roofing nails. Then fire them out of a pneumatic spud gun at 100psi. View Quote
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neight

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Posted: 3/3/2024 3:07:39 AM EDT

[#9]

Forgive me I'm just jumping in, and new to the DD realm. But I cast copious amounts of metal. Mainly aluminum and brass and bronze. I also cast iron quite a bit. So an iron chill mold could turn out infinite pellet projectiles in low temp metal like aluminum or a denser alloy. I guess if it's too heavy it can damage the rifling or contain too much pressure? I fell into a LMT rail mount a few weeks ago and got a Pace defense frame, and just today while looking at my email on the can caught a LMT classic receiver from V1. Now Im so excited about a stamped lawn dart gun I don't know where to start!

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Posted: 3/3/2024 3:11:20 AM EDT

[#10]

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Originally Posted By neight:
Forgive me I'm just jumping in, and new to the DD realm. But I cast copious amounts of metal. Mainly aluminum and brass and bronze. I also cast iron quite a bit. So an iron chill mold could turn out infinite pellet projectiles in low temp metal like aluminum or a denser alloy. I guess if it's too heavy it can damage the rifling or contain too much pressure? I fell into a LMT rail mount a few weeks ago and got a Pace defense frame, and just today while looking at my email on the can caught a LMT classic receiver from V1. Now Im so excited about a stamped lawn dart gun I don't know where to start!

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Look at Grog's loading info before you start doing a lot of reloading for the 37 or 40mm stuff. I'm far from an expert on it.

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sparky923 Joined Dec 2005 Posts 12054 EE 0% (0) OR, USA	Posted: 3/3/2024 4:09:25 PM EDT [#11] 3D print a similar casing?

Bravo_Six Member Joined Jul 2007 Posts 13626 EE 100% (6) PA, USA	Posted: 3/5/2024 12:34:11 PM EDT [#12] I wonder how hard these would be on a chrome lined 26.5mm barrel. My registered RV85 has been nagging me to feed it.

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Posted: 3/6/2024 2:28:42 PM EDT

[#13]

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Originally Posted By Bravo_Six:
I wonder how hard these would be on a chrome lined 26.5mm barrel.

My registered RV85 has been nagging me to feed it.

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I suspect they'd tear the hell out of it. At least if you made them out of concrete. If I was going to do that I'd print the mold smaller and make some sort of wad or sabot for them.

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Posted: 3/15/2024 10:00:22 AM EDT

[#14]

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Originally Posted By jhereg:

Should be able to cast it. I've read you can do lost PLA casting similar to lost wax but haven't done it. If you look at my link at the beginning the person who designed has molds you can print in PLA or TPU and cast them out of concrete. I printed that one to see how big it was and to be able to handle it and look at it.

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Quote History

Originally Posted By jhereg:

Originally Posted By neight:
Would casting something like this aluminum or zinc be practical and legal? I assume printing is popular because you get a uniform product without machining?

Should be able to cast it. I've read you can do lost PLA casting similar to lost wax but haven't done it. If you look at my link at the beginning the person who designed has molds you can print in PLA or TPU and cast them out of concrete. I printed that one to see how big it was and to be able to handle it and look at it.

https://us.polymaker.com/products/polycast

Polymaker has a filament for this purpose.

Amusing item to 3D print I found on thingiverse (26mm concrete pellet mold)

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