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There have been 414 items by roboman (Search limited from 11-May 97)
#170697 New Semi-auto Gun Idea
Posted by roboman on 19 August 2008 - 05:38 PM in Homemades
I just had this idea for a simple semi/full auto gun. The mechanism is very similar to one used by a person on spudfiles, and uses many of the same ideas as Captain Slug's Arr and ABP5K on nerfhaven. Basically, it consists of a short PVC tube w/ an endcap on one side. There is a hose barb mounted in the endcap, which goes to the trigger valve. A piston with a sliding o-ring mechanism is connected to a piece of 1/2 inch brass which slides over a piece of 15/32 inch brass that is connected firmly to the endcap's inside face. The 1/2 inch brass slides inside of the barrel (17/32" or 9/16" brass) and doubles as the bolt. A spring holds the piston in an open position. When air is allowed into the tube, the piston goes forward, stripping a dart out of the magazine, until it slides off of the 15/32" brass and air is allowed into the bolt. The air is channeled behind the dart, shooting it out of the barrel. When the trigger valve is closed, the return spring pushes back the piston, causing the o-ring to uncover the vent hole and allow unused air to escape. The gun will have a selector switch to choose between semi/full auto, and the valve will be activated by a solenoid. The solenoid will be triggered by either a 555 timer circuit configured as a monostable multivibrator or another 555 circuit configured as an astable multivibrator. Both circuits are adjustable by independent trimpots for precise ROFs. The trigger will be a simple snap-action switch that activates the oscillators. The trigger itself is a basic pushbutton valve that opens when pushed, and closes when released. A small LPA tank will be the stock, and will be able to be charged by a small double-acting pump. The solenoid will use two 9v batteries in parallel, to allow longer run times before a battery change is necessary. The rifle will be configured as a bullpup, and will have a 10-round removable box magazine in front of the stock that is expandable to a larger drum magazine.
Does anyone forsee any problems?
(Yes, I know that I forgot to show the oscillators, and they go in between the snap-action switch and the solenoid, with a DPDT slide switch for a selector.)
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Yes, I am new to this forum, and I am only 13, but I can be an asset to this board if you guys give me a chance.
#170699 I Really Need Help Here,
Posted by roboman on 19 August 2008 - 05:46 PM in General Nerf
#170762 Cpvc Outside Diameter
Posted by roboman on 19 August 2008 - 09:20 PM in Modifications
Mine is 1/2 SCH40.
SCH 40 PVC isn't CPVC.
#170944 Recon
Posted by roboman on 20 August 2008 - 01:53 PM in General Nerf
#171004 New Semi-auto Gun Idea
Posted by roboman on 20 August 2008 - 05:43 PM in Homemades
More complicated than it really needs to be. You can accomplish the same effect using only pneumatic components.
It would be more reliable to have the breech actuation speed controlled by a flow regulator.
And have the trigger valve(s) setup to simply empty the breech actuator into the barrel while closing off the supply line from the tank.
Unfortunately, I don't have the money/access to the tools for the construction of a full pneumatic system. Also, I am much more comfortable working with electronics.
#171265 New Semi-auto Gun Idea
Posted by roboman on 21 August 2008 - 01:55 PM in Homemades
Your system is actually more automatic than semi-automatic, but you don't have enough control over the timing of each part of the feed and firing cycle to be able to adjust the setup to increase reliability.
There are potentiometers on each of the circuits, which control the frequency of oscillation of the valve. A monostable multivibrator only pulses once for a set amount of time each time the input pin is pulled high (or low). An astable multivibrator oscillates continuously while the input pin is high (or low).
See below diagrams:
An astable multivibrator; R2 is swapped with a potentiometer, and the other component values are altered to achieve the desired frequency.
A monostable multivibrator; the resistor is swapped with a potentiometer, etc.
#171756 Modification and Paintjob Pictures
Posted by roboman on 23 August 2008 - 11:59 AM in Modifications
Its airbrushed with Testor's paints.
EDIT: Picture resized.
#171983 Vulcan With Roto Track Spring?
Posted by roboman on 24 August 2008 - 09:14 AM in Modifications
this may be because i've only moded my scout
If you've only modded your Scout, then it probably isn't a good idea to jump in and mod your Vulcan.
I was hopeing to increase some range because im only getting some were around 15'' (eye balled it so it may be more or less) with stock.
15" doesn't sound right for a Vulcan. Mine gets around 35 ft right out of the box!
#172291 New Semi-auto Gun Idea
Posted by roboman on 25 August 2008 - 10:42 AM in Homemades
#172295 New Semi-auto Gun Idea
Posted by roboman on 25 August 2008 - 11:05 AM in Homemades
Do you plan on actually making this? If so, when do you plan on having it done? Pneumatics are not my thing, and do not interest me all that much, so I don't have much to add on that point.
Yes, I do plan on making this, but it may be a while until its finished, since school is starting up again.
#172884 Paintball Tanks With Nerf
Posted by roboman on 27 August 2008 - 03:42 PM in Homemades
[indent=1]Ok, I have a question, my mom just bought an electric pump, it works on bikes, as well as cars...there is a gauge to show how much PSI is currently in the object it's pumping with about a 250PSI maximum, it was bought for $30. It is charged via eletric outlet and there is about a 2' hose that comes out of the front.
Is that an Air Man pump?
#172886 Modding My Nite Finder And I Have A Quick Question
Posted by roboman on 27 August 2008 - 03:51 PM in Modifications
#173230 E-tape On Plunger Head
Posted by roboman on 28 August 2008 - 05:39 PM in General Nerf
THAT'S WHAT SHE SAID!
added that hilarious quote to my signature, while playing with my butthole.
#175057 Labeled Vulcan Internals + Faq
Posted by roboman on 04 September 2008 - 09:31 PM in Modifications
EDIT: Never mind, I figured it out.
#180951 Other Projects
Posted by roboman on 01 October 2008 - 10:09 PM in Off Topic
A normal looking trash can...
The guts.
12" stroke!
Solenoid valve.
Power switch.
It's not quite done yet, and I am going to add a monster mask on top of the rod.
#180957 "stix" Commercial
Posted by roboman on 01 October 2008 - 10:24 PM in Off Topic
A company (not really a company, but just some random dickhead in Texas who has never made or sold a product) calling itself Anascape claims patents on analog stick and rumble technology (along with many other technologies used in game controllers) used in the Wii Gamecube controller, Wavebird, and Classic Controller. This little shit company sued Nintendo, and won. Now they are calling for a ban of nintendo's GC and Classic controllers, and Nintendo is trying to postpone or avoid that. Wii-Motes, however, are in no danger at all, and Analscope (as I will now refer to them) has no valid patent claims on Wii-mote technology (though it tried).
How can you claim a patent on analog stick technology? It's used in almost every modern R/C transmitter and game controller!
#181057 Newb Needs Some Schoolin - Arm-brace Mounted Blaster
Posted by roboman on 02 October 2008 - 06:14 PM in Homemades
Would a regulator like this be sufficient? Overkill?
http://www.hustlepai...p/11530101.html
That would work, but this would be cheaper.
#181429 What Is A Silencer? And A Breach Idea.
Posted by roboman on 04 October 2008 - 08:55 AM in Modifications
EDIT: You might want to fix your spelling and grammar before the mods get here.
#182851 Helical Clip Gun
Posted by roboman on 10 October 2008 - 06:09 PM in Homemades
#183323 Automated Foam Cutter - New Pics/vid
Posted by roboman on 12 October 2008 - 06:08 PM in Darts and Barrels
#184027 Nerf Gun Science Projects
Posted by roboman on 15 October 2008 - 09:43 PM in Modifications
#184035 Vulcan Safety Removal
Posted by roboman on 15 October 2008 - 10:03 PM in Modifications
#192015 Rapid Fire Rifle
Posted by roboman on 25 November 2008 - 11:44 PM in Modifications
#194186 Not A Rifled Barrel
Posted by roboman on 05 December 2008 - 10:20 PM in Homemades
#194189 Why Hasn't Somebody Thought Of This Before?
Posted by roboman on 05 December 2008 - 10:29 PM in Homemades
I don't mean to hijack the thread, but since the Big Salvo was mentioned from the start, I'd like to know if there is any significant body of work here on NH on the topic of piston type homemade valves. Like the valves used in SSPB, TS, Hornet, BigSalvo, SMDTG, etc., etc.
I'd really appreciate a few links or even suggestions what to search for, rather than to divert this thread away from sleeved-pin valves. I too was unable to solve the sleeve sealing problem in a way suitable for regular folks to make copies. But I still hope someone can.
By the way, I did build one where the sleeve was eliminated by using a solenoid to pull the valve open. Really cool, very effective, and at that time, the parts could easily be bought mail-order. Anyone who likes spending $50 and carrying around six D-cells (e.g., a Vulcan) might like my idea ... yeah, exactly my conclusion -- maybe for spudguns, but not practical for nerf.
I think this might be what you're looking for. The inline valve could probably be built for $20-30, and it would have a much better flow rate than a QEV. I think there was a thread on spudfiles about making an inline piston valve from an empty deodorant can. While that may be a little big for nerf guns, it could certainly be scaled down to the size you need.
#200845 Mega Maverick Shoots 100'
Posted by roboman on 03 January 2009 - 03:29 PM in Modifications
For the timing to work out, the valve shouldn't trigger until the end of the trigger stroke. That's when the turret is aligned with the valve.
Nice mod, though!
#202180 Maverick Mod Gone Wrong?
Posted by roboman on 09 January 2009 - 09:21 PM in General Nerf
#202181 Springs Help
Posted by roboman on 09 January 2009 - 09:23 PM in Modifications
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