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angle of points

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Unread postAuthor: SpudFarm » Tue Aug 05, 2008 1:24 pm

then i guess i will make it with a "longer" point..

i will try out all the darts with different angle.

i don't think a more shallow angle will work if i can't hardend them properly, i might try my welder and 25amps to heaten it. if it melts i just sharpend it again since i have enough mass
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Unread postAuthor: Gippeto » Tue Aug 05, 2008 1:38 pm

Spudfarm, do you have a center punch in your shop?

Look at the point, it is designed to be tough and resist being "altered" when striking metal.

It has a "short" point.
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Unread postAuthor: SEAKING9006 » Tue Aug 05, 2008 2:20 pm

Spud, even if you don't get the angle just perfect, you can always remedy that with added velocity. When piercing something with another something going really fast, as long as the other something is going fast enough, it'll go right through. Earlier in the thread, there was a discussion about metal hardness and selecting the right material for the dart. I have to disagree on hardness playing that much of a role. On the scale used, I doubt that water even has a rating, and if you give it enough oomph, it'll cut steel in two.


Remember that. :wink:
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Unread postAuthor: SpudFarm » Tue Aug 05, 2008 2:26 pm

i only got around 1000psi..

gippeto: i don't have a center punch since i make them myself but i will get one and messure the angle and after that shoot it :D


thanks for the help everyone
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Unread postAuthor: Hotwired » Tue Aug 05, 2008 2:27 pm

True that, the reason for tungsten being used as a penetrator is not primarily because it's hard but because it's extremely dense.
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Unread postAuthor: SpudFarm » Tue Aug 05, 2008 2:29 pm

hotwired: we know all that, but since tank armour is getting tougher it has to be hard to.

not one word about tank rounds anymore - okay?
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Unread postAuthor: DYI » Tue Aug 05, 2008 6:58 pm

The hardness does play a major role. With my SCTBDC, I was never able to go more than about halfway into 1/4" plate with annealed darts of any dimensions. On my first try with a hardened dart, I got a clean hole in the plate (and a very messy hole in the shed behind it :roll: ). I've still never put an annealed dart through that plate, and center punches still work every time. That's not to say that putting a soft round through harder steel is impossible (I've seen pictures of an LGG putting a low density plastic slug through 1/2" aluminum plate), but a harder slug is usually more energy efficient.
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Unread postAuthor: SpudFarm » Tue Aug 05, 2008 7:24 pm

just to up my odds i will go to the local machine shop and ask for the hardest 1cm rod they have.

and as said i will also get a center punch and try.
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