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Machined pengun - Dimply

Discuss miniature cannons built from things such as pill bottles and pen caps.
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Unread postAuthor: jackssmirkingrevenge » Mon Jun 27, 2011 10:47 am

Aaargh, missed it!

And yes, it's a pretty big pen gun. The whole "serviceable" thing needs space y'know :roll:
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Unread postAuthor: LeMaudit » Mon Jun 27, 2011 10:54 am

I never realized how big the pengun


It's because if it doesn't work, I'll stick some fins and send it to MrCrowley to fire the [female doggy] on a beach.

Uploading again, should be completed in an hour or so :?
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Unread postAuthor: Gun Freak » Mon Jun 27, 2011 11:11 am

Why does the brass lose the yellow color when you machine it?
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Unread postAuthor: LeMaudit » Mon Jun 27, 2011 11:13 am

It's called oxidation I think ;-)
Brass tarnish to a dark golden color, but fresh cut it is light gold.
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Unread postAuthor: jackssmirkingrevenge » Mon Jun 27, 2011 11:15 am

LeMaudit wrote:It's because if it doesn't work, I'll stick some fins and send it to MrCrowley to fire the [female doggy] on a beach.


A spudgun within a spudgun?

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Why does the brass lose the yellow color when you machine it?


That's its natural colour, the yellow is the patina which builts up due to the air.
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Unread postAuthor: LeMaudit » Mon Jun 27, 2011 11:22 am

A spudgun within a spudgun?


I'm working on a Matryoshka/Katyusha Rocket design ;-)
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Unread postAuthor: LeMaudit » Mon Jun 27, 2011 12:15 pm

Here we go again!
Step 7. The last external piece. Now I'll work on the internals

[youtube]http://www.youtube.com/watch?v=7I7TTs9Lpfw[/youtube]

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Unread postAuthor: jackssmirkingrevenge » Mon Jun 27, 2011 1:26 pm

*fa...er... can't wait to get home from work and burn through some brass!
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Unread postAuthor: LeMaudit » Mon Jun 27, 2011 3:09 pm

JSR, just to ease your pain about redoing work...

me too I had to redo this piece... look, there was a beump on the edge.

I first wanted to hold the piece only by the little rod onto the chuck... it was not long enough and the piece get loose and was stuck between the tool and the chuck.

Please also note that the fact that this mistake was not preventing the piece to work nor was visible inside the aluminum cap is completely irrelevant :D
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 28, 2011 12:18 am

LeMaudit wrote:me too I had to redo this piece... look, there was a beump on the edge.


I can just picture that :D

"Sacrebleu, une beump!"

*bins*

Please also note that the fact that this mistake was not preventing the piece to work nor was visible inside the aluminum cap is completely irrelevant :D


That clarification was far from necessary :)

Anyway, redid the nose part, this time I made the thread first, now much more crisp, and made everything else around it. Still not perfectly concentric but better than my previous effort, and the correct length too :)
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Unread postAuthor: LeMaudit » Tue Jun 28, 2011 8:11 am

"Sacrebleu, une beump!"


Sacrebleu cannot come close... in fact if I remember well what I said was in Spanish and involving one's mother.
:? I'll never do direct TV show :lol:

Good job on the redoing!

Just to be sure, when you say it is not concentric, is it when you screw it in the brass piece? Or looking at the bottom? Because it is normal the bottom is off center, due to the thread. Also, hand made threads are never perfectly concentric, this is why my body's step turn everything down to the final diameter; nose, plug and body. That way the concentric errors are canceled ;-)
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 28, 2011 9:13 am

LeMaudit wrote:Sacrebleu cannot come close... in fact if I remember well what I said was in Spanish and involving one's mother :?


The thought of Jacques Clouseau uttering "Me cago en su puta madre!" is as amusing as it is disturbing :D

Good job on the redoing!


Thanks :) but still not happy with it. Do Sherline pump gaseous perfectionism into their packages before sealing them?

Just to be sure, when you say it is not concentric, is it when you screw it in the brass piece? Or looking at the bottom? Because it is normal the bottom is off center, due to the thread.


Screwed in the brass piece, the centre hole wasn't concentric. I tried to avoid it with the following cutting plan but it doesn't seem to have worked :-/ As far as I can tell the theory is sound, cut the thread, use it as the new centre reference in the brass part and turn down everything around it - I think I'm cutting the ali too deep/fast and it's knocking it off centre in the chuck.
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Unread postAuthor: Fnord » Tue Jun 28, 2011 6:52 pm

I think someone's social life may be afflicted by a version of "elder scrolls 4" syndrome over the next few months...
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Unread postAuthor: Zeus » Tue Jun 28, 2011 7:23 pm

Fnord, that's not fair, I'm sure JSR will clean up the swarf.

Also, thanks to LeMaudit, I've not seen live machining before. But isn't the leadscrew a bit awkward to use being out so far?

(I presume it's the leadscrew, the thinggamybobby that feeds the tool towards the headstock)
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Unread postAuthor: jackssmirkingrevenge » Wed Jun 29, 2011 2:41 am

Fnord wrote:I think someone's social life may be afflicted by a version of "elder scrolls 4" syndrome over the next few months...


HAHAHA! Excellent! Isn't the the "someone is wrong on the internet" one :D

I actually had this conversation with LeMaudit, last night I had been planning on having a go at machining the pen gun body but my friends were having a drink nearby and I forced myself to join them, otherwise I am on the road to becoming the guy who sits on a bench shouting at passing busses before the age of 65 :roll:

Fnord, that's not fair, I'm sure JSR will clean up the swarf.


No, that's pretty much what it looks like - I brush of the lathe frequently but not the floor - and the swivel chair and table is quite accurate too :D

isn't the leadscrew a bit awkward to use being out so far?


Not really, I've found it quite comfortable to work with so far. The only problem is that I sometimes reach for the tailstock handwheel instead :)

update: was going to start the body but since it is so dependent on the endcaps which I'm not too happy with, so I'm remaking those first.

Here's the endcap first stage, cutting the thread. Note that it's much better cut that the previous one, and that I added a 5mm extension (which will later be cut off) turned down to the thread minor diameter to help keep things centred and make the die bite more easily. Note also the marks where it was held in the vice and how tightly it was held in order to cut the thread without slipping.
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