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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 13, 2011 1:06 am

Crna Legija wrote:With a bit of machining and epoxy, i'm sure you can make a adapter for standard thread size. If your lucky you can re-tap the shock pump connector to like m7 or 8 and the same as the OD of the pen.


If you're going to go through that effort, might as well make your own custom smallbore pump and take the pen gun to 1000 psi instead of 400 ;)

Something like this is definitely on the cards as a near future project, though using exhaust valve type mini cartridges like these as opposed to the brocock type the one linked to uses.

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Unread postAuthor: jor2daje » Mon Jun 13, 2011 1:20 am

Jsr I believe the live center was brought in because when it's cone shape is pressed into the spinning tube it almost perfectly centers it, the part is most likely loose enough to allow the few thou of movement that the live center caused. If not I'm sure LeMaudit will enlighten both of us.
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Unread postAuthor: jackssmirkingrevenge » Mon Jun 13, 2011 1:29 am

jor2daje wrote:Jsr I believe the live center was brought in because when it's cone shape is pressed into the spinning tube it almost perfectly centers it, the part is most likely loose enough to allow the few thou of movement that the live center caused.


I get that but shouldn't the chuck then have been retightened to fix the now centred part? Perhaps it was done off camera? Ah well, as you said we will be enlightened in a couple of hours I'm sure :)
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Unread postAuthor: LeMaudit » Mon Jun 13, 2011 8:03 am

what are the threads on the core? you could maybe do

the OD is very close to 13/64" or 5.16mm, the thread seems to be NF36... another exotic type of thread! But I certainly will explore in the future a way to make a sub-miniature valves... maybe based on existing cores... :-D

- why exactly did you use the live center,

jor2daje wrote: the live center was brought in because when it's cone shape is pressed into the spinning tube it almost perfectly centers it, the part is most likely loose enough to allow the few thou of movement that the live center caused.

I couldn't have explained better... in English! Thanks jor2daje!

I get that but shouldn't the chuck then have been retightened to fix the now centred part?

This was left on the cutting room's floor :? Wait for the Director's cut ;-)
But I'm very glad you follow so closely!

- why didn't you add a die holder to the shopping list? Not worth $60? Do I have to make one? ... or can I be sure of centred threads using the manual holder?

Well... I lived without it during 10 years... I just bought it, it was it's first cut! And you where in a budget remember? And in a hurry?
Didn't I told you "wait wait hold the credit card I need to check through all my drawers !!" :lol: This one was still in its cardboard box!

There's other accessories you'll need too. This one, you can do well holding by hand the die as I show on the video, and you can also do it the other way around for extra precise alignment: tighten the die on the head chuck, and hold your piece on the tail chuck like it was a drill bit (max diameter 3/8"). It you tighten carefully (evenly around) it's precise enough.
You could also machine your own, it's a simple project (I'm lazy I just bought it) and you could use for example the drill chuck to hold a cylindrical support if you don't want to machine a Morse taper MT0 ... though it is also a nice way to learn how to do it, and maybe cut a bit of mild steel. You will also have a MT0 as part of your accessories that you could use and adapt to your holder. Lots of ways...

Machining some adapters is part of the fun... and may even make you save both time and money in the long run; for example here's my "universal" saw holder, that can auto center any kind of small saw's hole diameter (imperial, metric, 1/2", 5/8", 10mm, 15mm, whatever):
Image
Image
Image
It just screw in as an extension of the existing Sherline saw holder. And you will have MT1 taper attachment too, as is also part of your chuck accessories... see, I thought a bit about it, budget wise... ;-)

I believe the original iteration was "man needs god..."

I would not dare changing the quotes of my favorite humorist Pierre Desproges. It's bold enough from me to try to translate its very weird French humor.
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Unread postAuthor: jackssmirkingrevenge » Mon Jun 13, 2011 9:03 am

LeMaudit wrote:But I certainly will explore in the future a way to make a sub-miniature valves... maybe based on existing cores... :-D


The idea with the cartridges is that the valve is a simple pin shape with an o-ring around it, and the need for attachment is avoided by having a pump with built in chamber.

This was left on the cutting room's floor :? Wait for the Director's cut ;-)


Ah, makes sense now :)

But I'm very glad you follow so closely!


I'm very conscious of the fact I'm going to have to replicate your work, I need to know what's going on ;)

Well... I lived without it during 10 years... I just bought it, it was it's first cut! And you where in a budget remember? And in a hurry?
Didn't I told you "wait wait hold the credit card I need to check through all my drawers !!" :lol: This one was still in its cardboard box!


*whistle* - good to have but not absolutely necessary then :)

There's other accessories you'll need too. This one, you can do well holding by hand the die as I show on the video, and you can also do it the other way around for extra precise alignment: tighten the die on the head chuck, and hold your piece on the tail chuck like it was a drill bit (max diameter 3/8"). It you tighten carefully (evenly around) it's precise enough.


I was thinking that might be an option, thanks!

You could also machine your own, it's a simple project (I'm lazy I just bought it) and you could use for example the drill chuck to hold a cylindrical support if you don't want to machine a Morse taper MT0 ... though it is also a nice way to learn how to do it, and maybe cut a bit of mild steel. You will also have a MT0 as part of your accessories that you could use and adapt to your holder. Lots of ways...

Machining some adapters is part of the fun... and may even make you save both time and money in the long run; for example here's my "universal" saw holder, that can auto center any kind of small saw's hole diameter (imperial, metric, 1/2", 5/8", 10mm, 15mm, whatever):

It just screw in as an extension of the existing Sherline saw holder. And you will have MT1 taper attachment too, as is also part of your chuck accessories... see, I thought a bit about it, budget wise... ;-)


One for a rainy day :)

I would not dare changing the quotes of my favorite humorist Pierre Desproges. It's bold enough from me to try to translate its very weird French humor.


Ah. Outside the sphere of French humour, it seems it was a femminist appropriation of a comment on theism. Boooooooo!

:D
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Unread postAuthor: LeMaudit » Mon Jun 13, 2011 9:43 am

jackssmirkingrevenge wrote:Ah. Outside the sphere of French humour, it seems it was a femminist appropriation of a comment on theism. Boooooooo!:D


I didn't know that! :-D
I guess Desproges quoted it then. He hated war, chauvinism, religion, politicians, stupidity in general and made lots of comments like that in his texts. This one just made me laugh... and was easy enough to translate. He played a lot with words, and sadly that cannot translate most of the time.

His comments were nonsensical, outrageous and black-humored... you never knew when he was joking or serious. And he said things that are really outrageous; I'm thinking about some comments one could qualify of very racist... unless you take it as very twisted and a black humored way... of telling you what NOT to think! ;-) Then you understand he was a humanist.
I would not dare quoting those, they may be too French to be understood :lol:

I miss him badly :cry:
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Unread postAuthor: jackssmirkingrevenge » Mon Jun 13, 2011 11:11 am

LeMaudit wrote:I guess Desproges quoted it then. He hated war, chauvinism, religion, politicians, stupidity in general and made lots of comments like that in his texts. This one just made me laugh... and was easy enough to translate. He played a lot with words, and sadly that cannot translate most of the time.

His comments were nonsensical, outrageous and black-humored... you never knew when he was joking or serious. And he said things that are really outrageous; I'm thinking about some comments one could qualify of very racist... unless you take it as very twisted and a black humored way... of telling you what NOT to think! ;-) Then you understand he was a humanist.


The same can be said of many fine British comics, that said the humour is so heavily dependent on language that it would be lost in translation - though I appreciate that the sentiment is the same :)

This it turning into a philosopengun :D
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Unread postAuthor: LeMaudit » Mon Jun 13, 2011 11:53 am

that said the humour is so heavily dependent on language that it would be lost in translation


I can appreciate British humor, but truly because I understand English well... there's some hints I don't catch 100% I'm sure. French humor is much more nasty and sarcastic than British, who relate much more to absurd (the Monty and others...).
Discovering worldwide humor from member's experience and culture may worth a separate thread in the non-spud section :-D

:shock: :shock: :shock: :shock:

Oops! I'm out of glue!
Now I need to rush to the hardware store and buy some metal epoxy if I want to finish step3... :D
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Unread postAuthor: jackssmirkingrevenge » Mon Jun 13, 2011 11:56 am

LeMaudit wrote:Oops! I'm out of glue!
Now I need to rush to the hardware store and buy some metal epoxy if I want to finish step3... :D


Nooo... Araldite!
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Unread postAuthor: dewey-1 » Mon Jun 13, 2011 8:50 pm

LeMaudit;

I too can make dimples!
Except mine has all the functional parts, not just a simple shell rendering. :D

Waiting for the valve cap yet!
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Unread postAuthor: warhead052 » Mon Jun 13, 2011 9:07 pm

Time for a noob question. Does a die create outer threads? I know a tap creates inner threads, but does a die do the opposite? Nice work so far by the way.
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Unread postAuthor: LeMaudit » Mon Jun 13, 2011 10:15 pm

Except mine has all the functional parts, not just a simple shell rendering


Any proof of that preposterous claim? :D
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Unread postAuthor: dewey-1 » Mon Jun 13, 2011 11:02 pm

How about a wireframe model for now!

Made my own valve cover cap because some one was to slow to give me their dimensions.
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Unread postAuthor: velocity3x » Mon Jun 13, 2011 11:10 pm

warhead052 wrote: Does a die create outer threads?

Yes
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Unread postAuthor: jackssmirkingrevenge » Mon Jun 13, 2011 11:49 pm

dewey-1 wrote:How about a wireframe model for now!


Image

Truly fapworthy Duane, nice!

Made my own valve cover cap because some one was to slow to give me their dimensions.


I wonder who that might have been :D
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