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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: kablooie » Sat Jun 11, 2011 7:30 pm

Cool video, I was somehow mesmerized. I want one. I look forward to seeing this project completed.
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Unread postAuthor: ramses » Sat Jun 11, 2011 7:39 pm

I would suggest dimpling before you bore the body of the pengun.
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Unread postAuthor: jackssmirkingrevenge » Sat Jun 11, 2011 7:47 pm

ole!

Brilliant, that is -exactly- the sort of guidance I'm going to need. Can't wait for more!

Duane, nice drawing - finally we will be seeing eye to eye on this :)

kablooie wrote:Cool video, I was somehow mesmerized. I want one.


I'm starting to think the Sherline is actually some primitive mind control device, it had exactly the same effect here!
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Unread postAuthor: ramses » Sat Jun 11, 2011 8:36 pm

jackssmirkingrevenge wrote:I'm starting to think the Sherline is actually some primitive mind control device, it had exactly the same effect here!


I have to admit, I'm not too impressed by them after using a mini lathe. I am impressed by his attention to keeping the lathe clean. Perhaps I'm just a slob, but I generally don't clean the lathe until I start loosing stuff in the pile of chips.
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Unread postAuthor: Davidvaini » Sat Jun 11, 2011 9:00 pm

if you were shooting spherical projectiles, you could install a type of hopup that causes backspin on the projectile, even with low velocity shots shooting around 10 feet, ive seen their ranged doubled. Even if it is a fixed hopup or a tiny set screw in the barrel, It would really increase the range...
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Unread postAuthor: LeMaudit » Sat Jun 11, 2011 9:00 pm

Oh the chatter... why didn't you put the work closer to the chuck

I didn't machine since a long time really... years... I need to get the feeling of the speed/feed again :-D The rod is long because brass is not easy to find, I'll use the other end for another piece. Too short and I could not do that. And the rod is larger than the axis hole to I cannot slide it inside.


I would suggest dimpling before you bore the body of the pengun.

Why? I kept on purpose mill operations to the end, because JSR will need to disassemble his lathe to go to milling mode. Better do that only once.


I'm starting to think the Sherline is actually some primitive mind control device, it had exactly the same effect here!


:twisted: MUHAHAHAHA!


I'm not too impressed by them after using a mini lathe

I've seen miniature wonders that people owning mini-lathe cannot do, or maybe are not interested to do. Different tools for different purposes I believe. You could tract a trailer with your Rolls... but would you? ;-)


I am impressed by his attention to keeping the lathe clean. Perhaps I'm just a slob, but I generally don't clean the lathe until I start loosing stuff in the pile of chips.

:lol: There's multiple reasons to that.
- The main is that the leadscrews are open to dirt and metal chips. You don't want a chip going in there, nor between aluminum sliding parts. This is especially important for steel chips of course, but even for soft metals it's a good habit to keep.
- Also, when I machine miniatures, may times the chips are bigger than the pieces I machine. I've lost a lot of tiny pieces in the chips. Now I clean to increase the chance to find something I dropped.
- Plus, the workshop is a room in my house, so I try to keep things a bit clean, more than if is was a workshop in my garage. This also please the wife, a nice bonus.
- Lastly, it's not that inconvenient... my shop-vac is actuated by remote control, so I can grab the hose on and off in a blink ;-)
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Unread postAuthor: jackssmirkingrevenge » Sat Jun 11, 2011 9:01 pm

ramses wrote:I have to admit, I'm not too impressed by them after using a mini lathe.


A micro lathe like this onewhich can be purchased from the US for less than $500 is available for 745 euros locally from one of the cheapest outlets, that's almost $1070. Even buying a "cheap" chinese import would have been a considerable investment.

By investing in the Sherline, I think I have a complete (for now :)) package which is of assured quality, more than adequate for the dimensions and materials I want to work with, and with the potential for future upgrades should I ever go down the CNC route (stranger things have happened...)

Davidvaini wrote:if you were shooting spherical projectiles, you could install a type of hopup that causes backspin on the projectile, even with low velocity shots shooting around 10 feet, ive seen their ranged doubled. Even if it is a fixed hopup or a tiny set screw in the barrel, It would really increase the range...


Again, for a pen gun talking of "range" is a bit moot, plus you'd have to make sure you're holding it the right way up, hop up can easily become hop down :)

Also, this isn't a 400 fps lightweight airsoft BB, but a much denser steel sphere likely travelling at higher velocity (never actually managed to chrony one of mine, projectiles are too small for the chrony to see...) so I don't see the point.
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Unread postAuthor: Davidvaini » Sat Jun 11, 2011 9:18 pm

ah, maybe range is moot because you dont have a hopup :D

If you close your mind and never try to acheive range with a pengun, then of course it will never have range :D
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Unread postAuthor: jackssmirkingrevenge » Sat Jun 11, 2011 9:24 pm

Davidvaini wrote:If you close your mind and never try to acheive range with a pengun, then of course it will never have range :D


True - but then it kinda stops being a pen gun ;)

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Unread postAuthor: Davidvaini » Sat Jun 11, 2011 9:26 pm

na, even witha little pengun, I bet you could achieve 100 feet with steel bb.

if only I didnt have like 10 other projects at the moment with a broken car :/
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Unread postAuthor: jackssmirkingrevenge » Sat Jun 11, 2011 9:36 pm

Davidvaini wrote:na, even witha little pengun, I bet you could achieve 100 feet with steel bb.


A pengun that can punch through a soup tin 1 foot away will definitely travel 100 feet and more, with or without hopup, I'm not questioning that. The question is, can you actually hit anything at that range, and if you do fit a sighting mechanism that allows you do to so (Duane had mentioned a laser which sounds like the most compact idea but still rather bulky) is it still worthy of being called a pen gun?
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Unread postAuthor: ramses » Sat Jun 11, 2011 9:40 pm

I suppose Sherline is just different, not worse. And there's no off-the-shelf CNC stuff for Sieg (Except for their new mill, but that's just expensive). I really wish I had a precise longitudinal feed (rather than the sloppy rack and pinion). This brings up an interesting question: can Sherline lathes single-point threads?

I suggested doing the dimpling before the boring because the solid bar will be more ridged than the bored bar. I suppose flipping the body of the gun would move the area to be machined closer to the rotary table, somewhat eliminating this point.

JSR, you're missing the pen suppressor.
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Unread postAuthor: LeMaudit » Sat Jun 11, 2011 9:42 pm

Duane had mentioned a laser which sounds like the most compact idea but still rather bulky


ohhh... a pengun with integrated laser sight... I need to work on that! :lol:

If the pen is part of the gun, does it count? ;-)
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Unread postAuthor: jackssmirkingrevenge » Sat Jun 11, 2011 9:45 pm

ramses wrote:This brings up an interesting question: can Sherline lathes single-point threads?


Needs an attachment.

JSR, you're missing the pen suppressor.


Note that the front cap and barrel are removable, provision for different variants in future ;)

LeMaudit wrote: If the pen is part of the gun, does it count? ;-)


That needs a cartridge though ;) if we develop a workable one, the world is our oyster...
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Unread postAuthor: Davidvaini » Sat Jun 11, 2011 10:16 pm

pen gun, with two little thread holes, one on the front that goes somewhat into the barrel, and one in the back, have the sight atually be threaded into those threaded holes. And the two parts of the sight would be threaded onto each other, and that combination of the two sights threaded togehter would thread onto the back of the pen thus still looking like a pen when you carry it around, simply unscrew the sights from the back and put each one in its threaded hole... you have sights for your pen gun while still retaing your overall pen look. Could even make the front sight double as the set screw for the hopup to acheive range.
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