Instructables
Picture of Semi-Auto Longshot 2
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Some of you reading this may remember my last shenanigan, there were some issues with the design and I decided to scrap the pneumatic bolt altogether for my second attempt. I honestly have no idea how much the last longshot cost, I kinda just stopped counting after a while. This blaster is still a work in progress, attempting to juggle this project /school/ HvZ/ Senior design is rather difficult. This instructable will be updated several times in the coming weeks, but I hoped that the progress so far would be enough to enter the Epilog contest. Alright enough about this... on to the technical details!
  • Raw materials you'll need:
  • 3/8" thick acrylic sheet (Mcmaster P/N-8774K41)
  • 5/8 Diameter metal rod, I'll explain later
  • #10-32 Soc Hd cap screws (Mcmaster P/N-90128A940)
  • 1/4-20 Soc Hd set scr (Mcmaster P/N-91375A533)
  • #5-40 Soc Hd cap screws (Mcmaster P/N-91251A130)
  • 0.5" DIA X 12" Lg PVC pipe (98 cents at Home depot)
  • .5" x .5" x 1" piece of aluminum/CRS
  • .25 x .25 x 2" piece of aluminum/CRS


This is all necessary to begin the mechanical fabrication, feel free to substitute any or all the fasteners to suit whatever you have on hand as these are just the sizes I used on mine. Just to give you an idea of what we will be constructing see the images below. Next up, manufacturing!

Oh and to give you a taste of the firing rate check this video out, it misfired a few times but that is just because the stepper motor limit switches weren't wired up yet. 



This build was really inspired by Mass Effect 2, I've always loved how the LS resembled the M-15 vindicator style gun from ME2. I know there are definitive visual differences between the Long shot and the M15-Vindicator but I hope that once completed they will look very similar. As the organizer for my universities HvZ game I play as the Commander NPC "Commander Shepard," so i felt that an M-15 vindicator would be a worthy blaster to wield =). 

Here is an update video, the motors are running at 1/4 power which is why the dart velocity is a bit low. Once the boost converter is finished I'll take a video showing it operating at full power.  Enjoy!

 
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uzarnom27 days ago

Thanks for posting this , i was having trouble with trying to make a semi auto strong arm but this guide showed me some possible solutions. Thanks :D

jcksparr0w1 year ago
i LOVE the fact that you might let a first team use a laser cutter. i hope if you get it they know what to do with it. very impressive project all around
Nuvasuper1 year ago
Why do you use a stepper motor instead of a setup where the motor lines up with the piston and can run continuously? I don't know the proper term, but something like this: http://www.botskool.com/images/mech/mech19.jpg
wcavanagh2 years ago
I would imagine using a push-type solonoid actuator would be easier / cheaper (and easier to fit inside the case better) than the stepper motor.
Philysteak527 (author)  wcavanagh2 years ago
Depends on the force required, not to mention solenoids generally have a very short stroke.
Quertyman2 years ago
I've been looking around for a dremal, would this one work and what tip do I need for it to cut PVC. http://www.amazon.com/Dremel-7300-N-MiniMite-4-8-Volt-Two-Speed/dp/B003TU0XFU
really any rotary tool will work. all you need to cut pvc is a cut off wheel. but try to stay at a low/medium speed for pvc. only because its a plastic and melts at a high speed
Philysteak527 (author)  curious youth2 years ago
Like curious said, PVC melts very easily so you will want to get a feel for how fast you can cut with things like abrasive discs. Although at times it is beneficial that it melts, much easier to clean up a bit of melted plastic off your part with a utility knife than drag out a vacuum cleaner (In my opinion at least).
rickkix2 years ago
This stuff is awesome. Not to be rude, but why waste your time making a semi? You should try something like making a minigun out of a Vulcan or something like that.
Philysteak527 (author)  rickkix2 years ago
This isn't just a semi-automatic blaster, being it is fed with a motor it can fire in full auto or burst modes.

Check out one of the demo videos, you'll see it isn't strictly semi-auto.
This is amazing. I am totally adding flywheels to mine.
(i have a spectre so this may be pretty odd, but I think it will work out.)
Keep up the ideas, they're awesome!
jumpingcat3 years ago
i like it pwns
joh543 years ago
You should make a full auto recon
That would pwn
jongscx joh543 years ago
Just got a recon shell from a friend, I'm workin on that now...
joh54 jongscx3 years ago
awsome
Philysteak527 (author)  joh543 years ago
This system will fit into pretty much any clip system blaster =)
nicwitzke3 years ago
Do you really need an arduino? Couldn't you just make it have a series of hinges, and only use one micro switch for the trigger
jongscx3 years ago
An arduino seems like overkill for this project...I guess it's a necessity for the stepper motor, but jeez. Maybe add an ammo-counter that resets when a new clip is added.

I've never been a fan of flywheel systems. I think a nerf gun should use air... but that's just me. How long do you need to wait for the wheels to spool to firing speed? is there where the 4 rps figure comes from? In any case, I love that you have the two variants of longshots, very cool work!
TSC3 years ago
Thanks for makeing theses there so cool! I would like to build one some time!
Musicman413 years ago
I think I understand your firing mechanism but I am not sure. It looks to me like you feed the darts through two powered wheels. It looks like the turning of these wheels is what propels the dart out of the barrel. Is this correct, or am I missing something, or is something not included yet?
From what I can see also, that seems correct...
Philysteak527 (author)  Kaiven3 years ago
That is correct, it works on a similar principal to a baseball launcher.
what do you think is the hardest nerf gun to mod
Philysteak527 (author)  taowyman3 years ago
Good to hear it cows, you would be surprised at the useful things you can come up with when modifying these toys. Not to mention you can use the skills you learn and apply them to a multitude of projects.

If I had to pick one i'd say the new dart tag line with the built in mags, they are incredibly complicated to even disassemble.
Thought so, it's a very good design, great write up. Actually, after seeing this I whipped out my Recon CS-6. I think I'm going to more mods than I did before ;)
Morte_Moya3 years ago
Windcalmer from the forum here. This is a really great write-up. I love the flywheel design. Simple and looks to be VERY strong.
taowyman3 years ago
would you sell this and how much
Philysteak527 (author)  taowyman3 years ago
I'd like to offer some hobby services if I win the Epolog laser cutter. I'd be willing to sell the mechanical portion of this blaster in a kit for about $20-$25, as well as a few other assorted robotics kits.

Other than the mechanical part you should expect to spend around 40-50 on the electronics.
cool ill think about getting this and hopefully i can find some more money:P
Iridium73 years ago
Just a little FYI but, This would be fully automatic. "semi-auto" is actually called 3-round burst or just burst. Real semi-auto is just the way it comes stock, can also be called single shot. Not meaning to be rude, there's just a bit of a difference.
I'm pretty sure with semi auto it's just as fast as you pull the trigger. A single shot is different as you need to prime the gun bolt between each shot. Hence the name bolt action.
I agree with you in principle... but the accepted 'slang' if you will is that it is originally considered a bolt action or single shot, semi automatic is what you would call an auto-loader, or a weapon that fires every time you pull the trigger, without having to cycle a bullet into the chamber, with automatic meaning to be able to hold the trigger for continuous fire.

Since this is the normal 'slang' I would accept his use of it since 90% of the populace thinks like that instead of the 'proper' way.

If it looks, thinks, and acts like a duck, its probably a duck.
or maybe its a brant, and the observer doesn't know that.
Philysteak527 (author)  ilpug3 years ago
I agree that this would realistically be considered "full auto," but if you google "semi auto longshot" you'll find my mods. I'm really just trying to get people to see this.
taowyman3 years ago
this is epic how much would u say it would cost if i have the gun?
ilpug3 years ago
Amazing gun. I have been thinking along the lines of pneumatics for a nerf mod, but not a flywheel system. I personally think the longstrike is the best gun to mod, because it has a MASSIVE interior space to cram in all kinds of parts.
Philysteak527 (author)  ilpug3 years ago
Got ya covered ;)

http://www.instructables.com/id/Semi-Automatic-NERF-Longshot/
I saw that one. very nicely done, but a bit out of my price range, and i don't like dabbling with C02, because i have never had good luck with it. I might mod my lonestrike to use your flywheel system
Philysteak527 (author)  ilpug3 years ago
Flywheels are infinitely easier/cheaper to pull off than that CO2 system, not to mention there is alot of room for improvement and performance upgrades are easily installed.
yeah, definetely going to do this, but what is the purpose of all the electronics? it seems that the whole system could operate with just a few switches. also, what is the range of this gun?
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