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Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: USGF » Thu May 28, 2009 3:40 pm

Moonbogg wrote:
USGF wrote:JSR, Found some time to set up the pour. We had to heat the molds to around + 375° F before the tail started to fill nicely. Note the 9 volt battery and .177" (4.5mm) pellet in there for scale. Also a 2" UHMW blank for a pneumatic round we are planning. Oh, one of the first pellets that did not fill 100% was cut in half to show the skirt profile.


Will these molds be for sale at some point? Or would I have to come to you as a client? If for sale, any idea on a general price range for say a mold for 1 1/2" SCH10? I would love trying different materials to make the pellets out of. I have a rifled barrel that would be wicked with wax pellets or a more durable yet soft material.


Moonbogg, contact Jagerbond via PM. He will give you pricing. We are happy with the molds, we simply have to make various sizes. To adjust projectle weight, we have been making different tail inserts. You can supply us with a 3d Acad file for review if you want to design your own.
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Unread postAuthor: Moonbogg » Thu May 28, 2009 3:51 pm

USGF wrote:
Moonbogg wrote:
USGF wrote:JSR, Found some time to set up the pour. We had to heat the molds to around + 375° F before the tail started to fill nicely. Note the 9 volt battery and .177" (4.5mm) pellet in there for scale. Also a 2" UHMW blank for a pneumatic round we are planning. Oh, one of the first pellets that did not fill 100% was cut in half to show the skirt profile.


Will these molds be for sale at some point? Or would I have to come to you as a client? If for sale, any idea on a general price range for say a mold for 1 1/2" SCH10? I would love trying different materials to make the pellets out of. I have a rifled barrel that would be wicked with wax pellets or a more durable yet soft material.


Moonbogg, contact Jagerbond via PM. He will give you pricing. We are happy with the molds, we simply have to make various sizes. To adjust projectle weight, we have been making different tail inserts. You can supply us with a 3d Acad file for review if you want to design your own.


Oh excellent! OK thanks. I'll consider designing a pellet and then contact Jagerbond.
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Unread postAuthor: jagerbond » Fri May 29, 2009 6:20 am

Moonbogg wrote:
USGF wrote:JSR, Found some time to set up the pour. We had to heat the molds to around + 375° F before the tail started to fill nicely. Note the 9 volt battery and .177" (4.5mm) pellet in there for scale. Also a 2" UHMW blank for a pneumatic round we are planning. Oh, one of the first pellets that did not fill 100% was cut in half to show the skirt profile.


Will these molds be for sale at some point? Or would I have to come to you as a client? If for sale, any idea on a general price range for say a mold for 1 1/2" SCH10? I would love trying different materials to make the pellets out of. I have a rifled barrel that would be wicked with wax pellets or a more durable yet soft material.


MoonBogg
If you can give me length estimate I can give you quote. Also, where did you get rifled AL barrel from?
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Unread postAuthor: jackssmirkingrevenge » Wed Nov 02, 2011 12:48 am

This thread spotted on ENDO closely resembles the massive pellet dicussion here :)

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Not meant to be fired from spudguns though:

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Pretty good effect on target:

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Unread postAuthor: USGF » Tue Nov 08, 2011 5:04 pm

JSR,

You got a lathe now. Think you will machine similar molds anytime soon?


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Unread postAuthor: jackssmirkingrevenge » Tue Nov 08, 2011 11:00 pm

Such big bore projectiles would not really be relevant to my perennial lack of space problem. I'm certainly interested in casting though, maybe not lead but resin.

I don't know if you had seen my "APFSDS" projectiles:

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I have a feeling that mass produced, these could prove to be quite popular :)
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Unread postAuthor: USGF » Wed Nov 09, 2011 2:44 am

jackssmirkingrevenge wrote:I don't know if you had seen my "APFSDS" projectiles. I have a feeling that mass produced, these could prove to be quite popular :)


Need a large turn mill and some UHMW.... I sure'd like to see the damage video. :D

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Unread postAuthor: jackssmirkingrevenge » Wed Nov 09, 2011 3:20 am

More here :)

This was the damage of the larger sabot round vs what seems to be hardened 1/4" steel plate:

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I didn't risk a video, indeed the nail ricocheted upwards somehow and shattered one of my light fittings :-/ but now that I have the casing, you can be sure that future tests (due this week) will be filmed close up with confidence :D
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Unread postAuthor: USGF » Wed Nov 09, 2011 7:20 am

JSR,

Ram set pins? I thought we were gonna cut old truck axles. They are real hard. We got some 3" od UHMW bars here for fins...... :D

I suspect Ramset pins are case hardened steel. Piano wire works pretty good, so does old needle gun pins. For bigger stuff, the shanks from small concrete busters work. They are hard!

Keep up the good work.

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Unread postAuthor: jackssmirkingrevenge » Thu Nov 10, 2011 2:04 am

USGF wrote:Ram set pins? I thought we were gonna cut old truck axles. They are real hard. We got some 3" od UHMW bars here for fins...... :D


I'll drag up this example again:

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Rememberthis conversation? Extending the above as an analogy, I'm sure that similar rounds in one of your big bore combustions would eat through steel plate like a frozen stick of butter through warm steel ;)
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Unread postAuthor: al-xg » Thu Nov 10, 2011 3:39 am

Extending the above as an analogy, I'm sure that similar rounds in one of your big bore combustions would eat through steel plate like a frozen stick of butter through warm steel

The next spudfiles challenge ? :)
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Unread postAuthor: jackssmirkingrevenge » Thu Nov 10, 2011 4:25 am

al-xg wrote:The next spudfiles challenge ? :)


Slightly related, I think the mythbusters did a fairly shitty job with the "frozen bullet" theory...
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Unread postAuthor: Labtecpower » Thu Nov 10, 2011 6:42 am

Slightly related, I think the mythbusters did a fairly shitty job with the "frozen bullet" theory...


I was thinking about that too...

How about using frozen body tissue or bone? It should have a lot better mechanical properties than plain ice...
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Unread postAuthor: jackssmirkingrevenge » Thu Nov 10, 2011 7:52 am

Labtecpower wrote:How about using frozen body tissue or bone? It should have a lot better mechanical properties than plain ice...


They did it with frozen meat in Mythbusters but that's cheating...
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