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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: LeMaudit » Sun Jun 26, 2011 6:45 am

Anyway, part done. ish.


Well, looks nice enough!!

And if the thread is too short... you can always use epoxy! :P
You still have some, do you? ;)
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Unread postAuthor: jackssmirkingrevenge » Sun Jun 26, 2011 7:57 am

inonickname wrote:Might not be an option for you, seen as you don't have the two horses on tap :P


If I needed two horses and wanted to make shafts for my *preempts mockery* "jeep" I wouldn't have bought a Sherline ;)

iusedbeperfectionist wrote:And if the thread is too short... you can always use epoxy!


Oh no no no, the answer I expected was "You can always redo the part" - and to be honest, I will most likely do that before the build is over. First though, I've going to have a crack at the nose plug, I'm curious as to what working with aluminium will be like.

Watch this space :)
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Unread postAuthor: LeMaudit » Sun Jun 26, 2011 8:14 am

Oh no no no, the answer I expected was "You can always redo the part" - and to be honest, I will most likely do that before the build is over.


Very good! It was a test and you succeeded at it splendidly :D
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Unread postAuthor: jackssmirkingrevenge » Sun Jun 26, 2011 10:30 am

LeMaudit wrote:Very good! It was a test and you succeeded at it splendidly :D


Wasn't it!

:D

Part 3, which is just terrible because:

- the thread is not concentric

- the major diameter is far too small again, this time because I got carried away turning it down before cutting the thread

- the cap length is 14mm long instead of 15mm because yours truly didn't take the 1mm thickness of the parting tool into account

Also, as I imagined I like machining aluminium a bit less than I do brass.
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Unread postAuthor: warhead052 » Sun Jun 26, 2011 10:34 am

Wow jsr, you are moving FAST. I bet you will beat Maudit....
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Unread postAuthor: jackssmirkingrevenge » Sun Jun 26, 2011 10:38 am

warhead052 wrote:I bet you will beat Maudit....


I doubt it, he doesn't have to make the same part several times before he gets it right :D
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Unread postAuthor: warhead052 » Sun Jun 26, 2011 10:43 am

:D I bet he does every now and then.
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Unread postAuthor: FighterAce » Sun Jun 26, 2011 12:52 pm

jackssmirkingrevenge wrote: the cap length is 14mm long instead of 15mm because yours truly didn't take the 1mm thickness of the parting tool into account


Hows the finish with the parting tool? :D

You should cut the part so you have enough material for facing to the final dimension. You should really check those videos I sent you, JSR. Theres a lot of tips and tricks that will make your machining a lot easier. Not to mention step by step instructions and propper machining techniques :roll:
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Unread postAuthor: redhight » Sun Jun 26, 2011 2:59 pm

hello,
You is or the next stage of your pengun?
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Unread postAuthor: LeMaudit » Sun Jun 26, 2011 3:32 pm

he doesn't have to make the same part several times before he gets it right

I bet he does every now and then.

You will never know for sure! :P


Part 3, which is just terrible because

Well, you didn't practice before starting a simple project did you? You choose to practice ON the project :D
Don't feel bad, you'll need practice, one way or the other. I think you are doing quite well for a second day with the machine.


You is or the next stage of your pengun?

The next stage is completed... and this also complete all the pengun external pieces. I'm working on the video and I'll do a bit of polishing. I had again some remarks that the polishing could be better :roll: And I though I was picky!

I should post it hopefully for tomorrow, late evening.
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Unread postAuthor: jackssmirkingrevenge » Sun Jun 26, 2011 4:19 pm

FighterAce wrote:You should cut the part so you have enough material for facing to the final dimension. You should really check those videos I sent you, JSR. Theres a lot of tips and tricks that will make your machining a lot easier. Not to mention step by step instructions and propper machining techniques :roll:


I'm trying to mix a bit of that with the self-taught technique of my mentor, today I spent more time reading that producing brass and aluminium shavings :D

Well, you didn't practice before starting a simple project did you? You choose to practice ON the project :D


This was deliberate, personally it's a better way to further my "education", if at the cost of "proper" materials.

Don't feel bad, you'll need practice, one way or the other. I think you are doing quite well for a second day with the machine.


No bad feelings at all, well actually just one, the threading aspect, but I'm working on it :)

The next stage is completed... and this also complete all the pengun external pieces.


I see you're leaving the worky bits for the very end, damn cliffhangers :D

edit: been thinking about how to get a concentric thread, came up with the following ptential solution which I hope to try later today. I figure if I make the rod 5mm or so longer than the final length, and turn this down to just over the minimum diameter of the thread (say 9.9mm or so in this case) this will give the die enough space to easily bite into the rod while in the lathe, allowing me to accurately finish off on the vice. The extra thread portion is then removed once the thread is complete.

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Unread postAuthor: LeMaudit » Mon Jun 27, 2011 10:16 am

YouTube video was broken :?
check the following messages...
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Last edited by LeMaudit on Mon Jun 27, 2011 12:08 pm, edited 4 times in total.
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Unread postAuthor: warhead052 » Mon Jun 27, 2011 10:22 am

Yes! Another video! Now lets hope my power doesn't go out again while I watch it...
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Unread postAuthor: Gun Freak » Mon Jun 27, 2011 10:25 am

The first 3 and a half minutes of the video repeated... Lol :lol:
I never realized how big the pengun was until I saw it in your hand!!
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Unread postAuthor: jackssmirkingrevenge » Mon Jun 27, 2011 10:46 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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