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pvc shells

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pvc shells

Unread postAuthor: base45 » Sat Mar 08, 2008 5:25 pm

Ok well i'm pretty new to spud guns and i just came up with this idea im not sure if any one has already thought of this so if some one already has dont lose it.

I was watching mythbustes and i saw the girl making model frames for a rc car with this machine that used heated plastic and a vaccume device to mold stuff perfectly. So i thought to myself what a perfect way to make shells for a potato gun

<a href="http://s251.photobucket.com/albums/gg316/milesjohnson93/?action=view&current=pvcshells.jpg" target="_blank"><img src="http://i251.photobucket.com/albums/gg316/milesjohnson93/pvcshells.jpg" border="0" alt="Photobucket"></a>

i might be a little confusing so pm me if you want further details
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Unread postAuthor: FordGtMan » Sat Mar 08, 2008 5:29 pm

I think it will be hard to get the vaccume powerful enough and the pvc soft enough. but i think it could work though.
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Unread postAuthor: DYI » Sat Mar 08, 2008 5:38 pm

For some reason, this sounds a lot more complicated and prone to failure than casting wax, ice, Pykrete, concrete, aluminum, or lead, and then simply drilling out an appropriately sized hole in the back for stability.
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Unread postAuthor: dewey-1 » Sat Mar 08, 2008 5:52 pm

--
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Last edited by dewey-1 on Sun Apr 20, 2008 1:05 pm, edited 1 time in total.
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Unread postAuthor: Hubb » Sat Mar 08, 2008 6:10 pm

It is good that you are thinking, but it would be a lot easier just to use a section of pipe the same size as the barrel.
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Unread postAuthor: Davidvaini » Sat Mar 08, 2008 6:23 pm

yeah just use your shopvac....


not...
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Unread postAuthor: base45 » Sat Mar 08, 2008 6:32 pm

yea now i realize that it would be hard but if one of you out there has the skills i was just putting the idea out
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Unread postAuthor: VH_man » Sat Mar 08, 2008 6:51 pm

actually, i think this would work fairly well........

vaccum-formed things are EXTREMELY consistent. i think i might actually try this....
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Unread postAuthor: base45 » Sat Mar 08, 2008 7:02 pm

VH_man wrote:i think i might actually try this....


im so glad this topic wasnt totally pointless...if you do try this please pm me and tell me what the outcome is
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Unread postAuthor: bigbob12345 » Sat Mar 08, 2008 7:04 pm

this is a very good idea it may be harder to do than some alternatives but just being able to actually create one would make it all worthwhile.
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Unread postAuthor: base45 » Sat Mar 08, 2008 7:13 pm

bigbob12345 wrote:this is a very good idea it may be harder to do than some alternatives but just being able to actually create one would make it all worthwhile.


i was think of filling it up with about 100 .177 bbs and planting it in the side of a pumpkin...just for fun
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Unread postAuthor: Hotwired » Sat Mar 08, 2008 7:18 pm

Interesting thought.

Bear in mind that a vacuum only creates (at an unlikely best) a 15psi difference across the sheet so material would need to be pretty soft or thin.

Blow moulding is the opposite and can use much higher forces (if you needed them).
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Unread postAuthor: base45 » Sat Mar 08, 2008 7:24 pm

Hotwired wrote:Blow moulding is the opposite and can use much higher forces (if you needed them).


do you mean like using compressed air and shooting it at the pvc sheet resulting in the pvc sheet being pushed in the pipe?
if so you could use both at the same time to make it a more even mold(so there are less thin spots)
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Unread postAuthor: Hotwired » Sat Mar 08, 2008 8:59 pm

Wouldn't need to have both.

If you use a vacuum it's practically identical to using compressed gas at up to 15psig on the other side. So might as well just use one but have it as strong as it needs to be.
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Unread postAuthor: base45 » Sat Mar 08, 2008 9:09 pm

yea your probably right
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