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"Lempo" pneumatic ballistic knife

Built a miniature 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: Zeus » Fri Oct 21, 2011 4:26 am

Only half a mL too, but seeing black bubbles and a nice irritating SO<sub>2</sub> smell was a slight suprise. Now I need to spill some HNO<sub>3</sub> on myself and pass it off as iodine stains. Already had some exposure to Cl<sub>2</sub>, as my sig suggests.

Good luck with etching, if every steel surface I saw was hot blued I'd be quite happy.

And weird glassware, tell me moar...
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/sarcasm, /hyperbole
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 21, 2011 4:52 am

Jake shared this interesting link.

It's in Finnish but the pictures are quite self explanatory, I really like the idea of blackening the brass with sulfuric then polishing the raised areas... I think we might have a winner :) will take some *cough* samples home this afternoon and have play...
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Unread postAuthor: jackssmirkingrevenge » Sat Oct 22, 2011 5:47 am

Some etching experiments, using concentrated nitric acid on one piece and the hydrochloric/peroxide mix recommended in jake's link. In both cases I used nail polish (from my own personal collection, naturally Image) to mask the design.

Unsurprisingly the nitric went much quicker and bit deeper. I don't have the chemicals required to black it but used some ink and gave them a light polish, really happy with the effect :)
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hclh2o201.JPG
5 parts 37% HCl 1 part 30% H2O2
hno301.JPG
concentrated HNO3
etching.JPG
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Unread postAuthor: jackssmirkingrevenge » Sat Oct 22, 2011 12:06 pm

Here we go, a simple brass ring with some acid etching, much more comfortable to shoot now. I also redid the knife tail with a lighter aluminium support.

I'd like to black or otherwise colour the collar to bring out the lettering, need to consider options. Also needs a discreet stop for the collar to stop it falling off everytime I shoot it :roll:
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Unread postAuthor: pneumaticcannons » Sat Oct 22, 2011 12:10 pm

great work as always! the collar looks like it does help alot
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Unread postAuthor: jackssmirkingrevenge » Sat Oct 22, 2011 5:01 pm

Cheers :)

Some more work, added a front stop for the collar, and ordered a bottle of this stuff to blacken the collar and highlight the etching.
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Unread postAuthor: jakethebeast » Sat Oct 22, 2011 5:03 pm

nice, looks much better now :) the blade fits to it better now
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Unread postAuthor: Labtecpower » Sat Oct 22, 2011 5:05 pm

Much better ring :)
It looks a lot nicer than the previous one...
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 23, 2011 7:35 am

jakethebeast wrote:the blade fits to it better now


Agreed :)

Had some fun with etching in the meantime, damn this focus on aesthetics and my artistic streak forcing its way out of the cellar I had confined it to! I have engineering to do aaaughhh!!!!
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skulletching.JPG
skulletchingmaskingtape.JPG
another test this time using masking tape instead of nail polish, leaving more crisp lines as the latter tends to be eaten away by the acid.
CIMG3943.JPG
after some polishing...
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Unread postAuthor: jmez1996 » Sun Oct 23, 2011 8:46 am

jackssmirkingrevenge wrote:Here we go, a simple brass ring with some acid etching, much more comfortable to shoot now


What are the symbols on the ring?
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 23, 2011 8:59 am

jmez1996 wrote:What are the symbols on the ring?


Long story :wink:
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Last edited by jackssmirkingrevenge on Sun Oct 23, 2011 2:58 pm, edited 1 time in total.
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Unread postAuthor: Gun Freak » Sun Oct 23, 2011 9:02 am

Damn, those skulls look sick!
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Unread postAuthor: pneumaticcannons » Sun Oct 23, 2011 9:26 am

wow that final skull looks insanely cool!! what are the things your etching on?
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Unread postAuthor: Labtecpower » Sun Oct 23, 2011 9:41 am

Nice skulls indeed :)

camo cake :shock:

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Unread postAuthor: jackssmirkingrevenge » Sun Oct 23, 2011 1:47 pm

Gun Freak wrote:Damn, those skulls look sick!


I think they're past sick ;)

what are the things your etching on?


Scrap pieces of brass, just playing with techniques at the moment.

camo cake


I knew I shouldn't have dragged up that thread :roll: thank goodness times have changed :D
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