"Lempo" pneumatic ballistic knife

Miniature guns are novelty custom, unique, and sometime downright crude! Common construction materials often include pill bottles or pens. Show us your work!
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Zeus
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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...
/sarcasm, /hyperbole
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jackssmirkingrevenge
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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...
hectmarr wrote:You have to make many weapons, because this field is long and short life
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jackssmirkingrevenge
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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 :)
Attachments
etching.JPG
concentrated HNO3
concentrated HNO3
5 parts 37% HCl 1 part 30% H2O2
5 parts 37% HCl 1 part 30% H2O2
hectmarr wrote:You have to make many weapons, because this field is long and short life
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jackssmirkingrevenge
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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:
Attachments
pbk303.JPG
pbk302.JPG
pbk301.JPG
hectmarr wrote:You have to make many weapons, because this field is long and short life
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pneumaticcannons
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Sat Oct 22, 2011 12:10 pm

great work as always! the collar looks like it does help alot
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jackssmirkingrevenge
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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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pbk401.JPG
hectmarr wrote:You have to make many weapons, because this field is long and short life
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jakethebeast
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Sat Oct 22, 2011 5:03 pm

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

Much better ring :)
It looks a lot nicer than the previous one...
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jackssmirkingrevenge
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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!!!!
Attachments
skulletching.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.
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.
after some polishing...
after some polishing...
hectmarr wrote:You have to make many weapons, because this field is long and short life
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jmez1996
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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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jackssmirkingrevenge
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Sun Oct 23, 2011 8:59 am

jmez1996 wrote:What are the symbols on the ring?
Long story :wink:
Last edited by jackssmirkingrevenge on Sun Oct 23, 2011 2:58 pm, edited 1 time in total.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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Gun Freak
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Sun Oct 23, 2011 9:02 am

Damn, those skulls look sick!
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pneumaticcannons
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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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Sun Oct 23, 2011 9:41 am

Nice skulls indeed :)

camo cake :shock:

Image
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jackssmirkingrevenge
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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
hectmarr wrote:You have to make many weapons, because this field is long and short life
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